--- _id: '8674' abstract: - lang: eng text: 'Extrasynaptic actions of glutamate are limited by high-affinity transporters expressed by perisynaptic astroglial processes (PAPs): this helps maintain point-to-point transmission in excitatory circuits. Memory formation in the brain is associated with synaptic remodeling, but how this affects PAPs and therefore extrasynaptic glutamate actions is poorly understood. Here, we used advanced imaging methods, in situ and in vivo, to find that a classical synaptic memory mechanism, long-term potentiation (LTP), triggers withdrawal of PAPs from potentiated synapses. Optical glutamate sensors combined with patch-clamp and 3D molecular localization reveal that LTP induction thus prompts spatial retreat of astroglial glutamate transporters, boosting glutamate spillover and NMDA-receptor-mediated inter-synaptic cross-talk. The LTP-triggered PAP withdrawal involves NKCC1 transporters and the actin-controlling protein cofilin but does not depend on major Ca2+-dependent cascades in astrocytes. We have therefore uncovered a mechanism by which a memory trace at one synapse could alter signal handling by multiple neighboring connections.' acknowledgement: We thank J. Angibaud for organotypic cultures and R. Chereau and J. Tonnesen for help with the STED microscope; also D. Gonzales and the Neurocentre Magendie INSERM U1215 Genotyping Platform, for breeding management and genotyping. This work was supported by the Wellcome Trust Principal Fellowships 101896 and 212251, ERC Advanced Grant 323113, ERC Proof-of-Concept Grant 767372, EC FP7 ITN 606950, and EU CSA 811011 (D.A.R.); NRW-Rückkehrerpogramm, UCL Excellence Fellowship, German Research Foundation (DFG) SPP1757 and SFB1089 (C.H.); Human Frontiers Science Program (C.H., C.J.J., and H.J.); EMBO Long-Term Fellowship (L.B.); Marie Curie FP7 PIRG08-GA-2010-276995 (A.P.), ASTROMODULATION (S.R.); Equipe FRM DEQ 201 303 26519, Conseil Régional d’Aquitaine R12056GG, INSERM (S.H.R.O.); ANR SUPERTri, ANR Castro (ANR-17-CE16-0002), R-13-BSV4-0007-01, Université de Bordeaux, labex BRAIN (S.H.R.O. and U.V.N.); CNRS (A.P., S.H.R.O., and U.V.N.); HFSP, ANR CEXC, and France-BioImaging ANR-10-INSB-04 (U.V.N.); and FP7 MemStick Project No. 201600 (M.G.S.). article_processing_charge: No article_type: original author: - first_name: Christian full_name: Henneberger, Christian last_name: Henneberger - first_name: Lucie full_name: Bard, Lucie last_name: Bard - first_name: Aude full_name: Panatier, Aude last_name: Panatier - first_name: James P. full_name: Reynolds, James P. last_name: Reynolds - first_name: Olga full_name: Kopach, Olga last_name: Kopach - first_name: Nikolay I. full_name: Medvedev, Nikolay I. last_name: Medvedev - first_name: Daniel full_name: Minge, Daniel last_name: Minge - first_name: Michel K. full_name: Herde, Michel K. last_name: Herde - first_name: Stefanie full_name: Anders, Stefanie last_name: Anders - first_name: Igor full_name: Kraev, Igor last_name: Kraev - first_name: Janosch P. full_name: Heller, Janosch P. last_name: Heller - first_name: Sylvain full_name: Rama, Sylvain last_name: Rama - first_name: Kaiyu full_name: Zheng, Kaiyu last_name: Zheng - first_name: Thomas P. full_name: Jensen, Thomas P. last_name: Jensen - first_name: Inmaculada full_name: Sanchez-Romero, Inmaculada id: 3D9C5D30-F248-11E8-B48F-1D18A9856A87 last_name: Sanchez-Romero - first_name: Colin J. full_name: Jackson, Colin J. last_name: Jackson - first_name: Harald L full_name: Janovjak, Harald L id: 33BA6C30-F248-11E8-B48F-1D18A9856A87 last_name: Janovjak orcid: 0000-0002-8023-9315 - first_name: Ole Petter full_name: Ottersen, Ole Petter last_name: Ottersen - first_name: Erlend Arnulf full_name: Nagelhus, Erlend Arnulf last_name: Nagelhus - first_name: Stephane H.R. full_name: Oliet, Stephane H.R. last_name: Oliet - first_name: Michael G. full_name: Stewart, Michael G. last_name: Stewart - first_name: U. VAlentin full_name: Nägerl, U. VAlentin last_name: Nägerl - first_name: 'Dmitri A. ' full_name: 'Rusakov, Dmitri A. ' last_name: Rusakov citation: ama: Henneberger C, Bard L, Panatier A, et al. LTP induction boosts glutamate spillover by driving withdrawal of perisynaptic astroglia. Neuron. 2020;108(5):P919-936.E11. doi:10.1016/j.neuron.2020.08.030 apa: Henneberger, C., Bard, L., Panatier, A., Reynolds, J. P., Kopach, O., Medvedev, N. I., … Rusakov, D. A. (2020). LTP induction boosts glutamate spillover by driving withdrawal of perisynaptic astroglia. Neuron. Elsevier. https://doi.org/10.1016/j.neuron.2020.08.030 chicago: Henneberger, Christian, Lucie Bard, Aude Panatier, James P. Reynolds, Olga Kopach, Nikolay I. Medvedev, Daniel Minge, et al. “LTP Induction Boosts Glutamate Spillover by Driving Withdrawal of Perisynaptic Astroglia.” Neuron. Elsevier, 2020. https://doi.org/10.1016/j.neuron.2020.08.030. ieee: C. Henneberger et al., “LTP induction boosts glutamate spillover by driving withdrawal of perisynaptic astroglia,” Neuron, vol. 108, no. 5. Elsevier, p. P919–936.E11, 2020. ista: Henneberger C, Bard L, Panatier A, Reynolds JP, Kopach O, Medvedev NI, Minge D, Herde MK, Anders S, Kraev I, Heller JP, Rama S, Zheng K, Jensen TP, Sanchez-Romero I, Jackson CJ, Janovjak HL, Ottersen OP, Nagelhus EA, Oliet SHR, Stewart MG, Nägerl UVa, Rusakov DA. 2020. LTP induction boosts glutamate spillover by driving withdrawal of perisynaptic astroglia. Neuron. 108(5), P919–936.E11. mla: Henneberger, Christian, et al. “LTP Induction Boosts Glutamate Spillover by Driving Withdrawal of Perisynaptic Astroglia.” Neuron, vol. 108, no. 5, Elsevier, 2020, p. P919–936.E11, doi:10.1016/j.neuron.2020.08.030. short: C. Henneberger, L. Bard, A. Panatier, J.P. Reynolds, O. Kopach, N.I. Medvedev, D. Minge, M.K. Herde, S. Anders, I. Kraev, J.P. Heller, S. Rama, K. Zheng, T.P. Jensen, I. Sanchez-Romero, C.J. Jackson, H.L. Janovjak, O.P. Ottersen, E.A. Nagelhus, S.H.R. Oliet, M.G. Stewart, U.Va. Nägerl, D.A. Rusakov, Neuron 108 (2020) P919–936.E11. date_created: 2020-10-18T22:01:38Z date_published: 2020-12-09T00:00:00Z date_updated: 2023-08-22T09:59:29Z day: '09' ddc: - '570' department: - _id: HaJa doi: 10.1016/j.neuron.2020.08.030 external_id: isi: - '000603428000010' pmid: - '32976770' file: - access_level: open_access checksum: 054562bb50165ef9a1f46631c1c5e36b content_type: application/pdf creator: dernst date_created: 2020-12-10T14:42:09Z date_updated: 2020-12-10T14:42:09Z file_id: '8939' file_name: 2020_Neuron_Henneberger.pdf file_size: 7518960 relation: main_file success: 1 file_date_updated: 2020-12-10T14:42:09Z has_accepted_license: '1' intvolume: ' 108' isi: 1 issue: '5' language: - iso: eng month: '12' oa: 1 oa_version: Published Version page: P919-936.E11 pmid: 1 publication: Neuron publication_identifier: eissn: - '10974199' issn: - '08966273' publication_status: published publisher: Elsevier quality_controlled: '1' scopus_import: '1' status: public title: LTP induction boosts glutamate spillover by driving withdrawal of perisynaptic astroglia tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8 volume: 108 year: '2020' ... --- _id: '137' abstract: - lang: eng text: Fluorescent sensors are an essential part of the experimental toolbox of the life sciences, where they are used ubiquitously to visualize intra- and extracellular signaling. In the brain, optical neurotransmitter sensors can shed light on temporal and spatial aspects of signal transmission by directly observing, for instance, neurotransmitter release and spread. Here we report the development and application of the first optical sensor for the amino acid glycine, which is both an inhibitory neurotransmitter and a co-agonist of the N-methyl-d-aspartate receptors (NMDARs) involved in synaptic plasticity. Computational design of a glycine-specific binding protein allowed us to produce the optical glycine FRET sensor (GlyFS), which can be used with single and two-photon excitation fluorescence microscopy. We took advantage of this newly developed sensor to test predictions about the uneven spatial distribution of glycine in extracellular space and to demonstrate that extracellular glycine levels are controlled by plasticity-inducing stimuli. article_processing_charge: No article_type: original author: - first_name: William full_name: Zhang, William last_name: Zhang - first_name: Michel full_name: Herde, Michel last_name: Herde - first_name: Joshua full_name: Mitchell, Joshua last_name: Mitchell - first_name: Jason full_name: Whitfield, Jason last_name: Whitfield - first_name: Andreas full_name: Wulff, Andreas last_name: Wulff - first_name: Vanessa full_name: Vongsouthi, Vanessa last_name: Vongsouthi - first_name: Inmaculada full_name: Sanchez Romero, Inmaculada id: 3D9C5D30-F248-11E8-B48F-1D18A9856A87 last_name: Sanchez Romero - first_name: Polina full_name: Gulakova, Polina last_name: Gulakova - first_name: Daniel full_name: Minge, Daniel last_name: Minge - first_name: Björn full_name: Breithausen, Björn last_name: Breithausen - first_name: Susanne full_name: Schoch, Susanne last_name: Schoch - first_name: Harald L full_name: Janovjak, Harald L id: 33BA6C30-F248-11E8-B48F-1D18A9856A87 last_name: Janovjak orcid: 0000-0002-8023-9315 - first_name: Colin full_name: Jackson, Colin last_name: Jackson - first_name: Christian full_name: Henneberger, Christian last_name: Henneberger citation: ama: Zhang W, Herde M, Mitchell J, et al. Monitoring hippocampal glycine with the computationally designed optical sensor GlyFS. Nature Chemical Biology. 2018;14(9):861-869. doi:10.1038/s41589-018-0108-2 apa: Zhang, W., Herde, M., Mitchell, J., Whitfield, J., Wulff, A., Vongsouthi, V., … Henneberger, C. (2018). Monitoring hippocampal glycine with the computationally designed optical sensor GlyFS. Nature Chemical Biology. Nature Publishing Group. https://doi.org/10.1038/s41589-018-0108-2 chicago: Zhang, William, Michel Herde, Joshua Mitchell, Jason Whitfield, Andreas Wulff, Vanessa Vongsouthi, Inmaculada Sanchez-Romero, et al. “Monitoring Hippocampal Glycine with the Computationally Designed Optical Sensor GlyFS.” Nature Chemical Biology. Nature Publishing Group, 2018. https://doi.org/10.1038/s41589-018-0108-2. ieee: W. Zhang et al., “Monitoring hippocampal glycine with the computationally designed optical sensor GlyFS,” Nature Chemical Biology, vol. 14, no. 9. Nature Publishing Group, pp. 861–869, 2018. ista: Zhang W, Herde M, Mitchell J, Whitfield J, Wulff A, Vongsouthi V, Sanchez-Romero I, Gulakova P, Minge D, Breithausen B, Schoch S, Janovjak HL, Jackson C, Henneberger C. 2018. Monitoring hippocampal glycine with the computationally designed optical sensor GlyFS. Nature Chemical Biology. 14(9), 861–869. mla: Zhang, William, et al. “Monitoring Hippocampal Glycine with the Computationally Designed Optical Sensor GlyFS.” Nature Chemical Biology, vol. 14, no. 9, Nature Publishing Group, 2018, pp. 861–69, doi:10.1038/s41589-018-0108-2. short: W. Zhang, M. Herde, J. Mitchell, J. Whitfield, A. Wulff, V. Vongsouthi, I. Sanchez-Romero, P. Gulakova, D. Minge, B. Breithausen, S. Schoch, H.L. Janovjak, C. Jackson, C. Henneberger, Nature Chemical Biology 14 (2018) 861–869. date_created: 2018-12-11T11:44:49Z date_published: 2018-07-30T00:00:00Z date_updated: 2023-09-13T08:58:05Z day: '30' department: - _id: HaJa doi: 10.1038/s41589-018-0108-2 external_id: isi: - '000442174500013' pmid: - '30061718 ' intvolume: ' 14' isi: 1 issue: '9' language: - iso: eng main_file_link: - open_access: '1' url: https://www.ncbi.nlm.nih.gov/pubmed/30061718 month: '07' oa: 1 oa_version: Submitted Version page: 861 - 869 pmid: 1 project: - _id: 255BFFFA-B435-11E9-9278-68D0E5697425 grant_number: RGY0084/2012 name: In situ real-time imaging of neurotransmitter signaling using designer optical sensors (HFSP Young Investigator) publication: Nature Chemical Biology publication_status: published publisher: Nature Publishing Group publist_id: '7786' quality_controlled: '1' scopus_import: '1' status: public title: Monitoring hippocampal glycine with the computationally designed optical sensor GlyFS type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 14 year: '2018' ... --- _id: '5984' abstract: - lang: eng text: G-protein-coupled receptors (GPCRs) form the largest receptor family, relay environmental stimuli to changes in cell behavior and represent prime drug targets. Many GPCRs are classified as orphan receptors because of the limited knowledge on their ligands and coupling to cellular signaling machineries. Here, we engineer a library of 63 chimeric receptors that contain the signaling domains of human orphan and understudied GPCRs functionally linked to the light-sensing domain of rhodopsin. Upon stimulation with visible light, we identify activation of canonical cell signaling pathways, including cAMP-, Ca2+-, MAPK/ERK-, and Rho-dependent pathways, downstream of the engineered receptors. For the human pseudogene GPR33, we resurrect a signaling function that supports its hypothesized role as a pathogen entry site. These results demonstrate that substituting unknown chemical activators with a light switch can reveal information about protein function and provide an optically controlled protein library for exploring the physiology and therapeutic potential of understudied GPCRs. article_number: '1950' article_processing_charge: No author: - first_name: Maurizio full_name: Morri, Maurizio id: 4863116E-F248-11E8-B48F-1D18A9856A87 last_name: Morri - first_name: Inmaculada full_name: Sanchez-Romero, Inmaculada id: 3D9C5D30-F248-11E8-B48F-1D18A9856A87 last_name: Sanchez-Romero - first_name: Alexandra-Madelaine full_name: Tichy, Alexandra-Madelaine id: 29D8BB2C-F248-11E8-B48F-1D18A9856A87 last_name: Tichy - first_name: Stephanie full_name: Kainrath, Stephanie id: 32CFBA64-F248-11E8-B48F-1D18A9856A87 last_name: Kainrath - first_name: Elliot J. full_name: Gerrard, Elliot J. last_name: Gerrard - first_name: Priscila full_name: Hirschfeld, Priscila id: 435ACB3A-F248-11E8-B48F-1D18A9856A87 last_name: Hirschfeld - first_name: Jan full_name: Schwarz, Jan id: 346C1EC6-F248-11E8-B48F-1D18A9856A87 last_name: Schwarz - first_name: Harald L full_name: Janovjak, Harald L id: 33BA6C30-F248-11E8-B48F-1D18A9856A87 last_name: Janovjak orcid: 0000-0002-8023-9315 citation: ama: Morri M, Sanchez-Romero I, Tichy A-M, et al. Optical functionalization of human class A orphan G-protein-coupled receptors. Nature Communications. 2018;9(1). doi:10.1038/s41467-018-04342-1 apa: Morri, M., Sanchez-Romero, I., Tichy, A.-M., Kainrath, S., Gerrard, E. J., Hirschfeld, P., … Janovjak, H. L. (2018). Optical functionalization of human class A orphan G-protein-coupled receptors. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-018-04342-1 chicago: Morri, Maurizio, Inmaculada Sanchez-Romero, Alexandra-Madelaine Tichy, Stephanie Kainrath, Elliot J. Gerrard, Priscila Hirschfeld, Jan Schwarz, and Harald L Janovjak. “Optical Functionalization of Human Class A Orphan G-Protein-Coupled Receptors.” Nature Communications. Springer Nature, 2018. https://doi.org/10.1038/s41467-018-04342-1. ieee: M. Morri et al., “Optical functionalization of human class A orphan G-protein-coupled receptors,” Nature Communications, vol. 9, no. 1. Springer Nature, 2018. ista: Morri M, Sanchez-Romero I, Tichy A-M, Kainrath S, Gerrard EJ, Hirschfeld P, Schwarz J, Janovjak HL. 2018. Optical functionalization of human class A orphan G-protein-coupled receptors. Nature Communications. 9(1), 1950. mla: Morri, Maurizio, et al. “Optical Functionalization of Human Class A Orphan G-Protein-Coupled Receptors.” Nature Communications, vol. 9, no. 1, 1950, Springer Nature, 2018, doi:10.1038/s41467-018-04342-1. short: M. Morri, I. Sanchez-Romero, A.-M. Tichy, S. Kainrath, E.J. Gerrard, P. Hirschfeld, J. Schwarz, H.L. Janovjak, Nature Communications 9 (2018). date_created: 2019-02-14T10:50:24Z date_published: 2018-12-01T00:00:00Z date_updated: 2023-09-19T14:29:32Z day: '01' ddc: - '570' department: - _id: HaJa - _id: CaGu - _id: MiSi doi: 10.1038/s41467-018-04342-1 ec_funded: 1 external_id: isi: - '000432280000006' file: - access_level: open_access checksum: 8325fcc194264af4749e662a73bf66b5 content_type: application/pdf creator: kschuh date_created: 2019-02-14T10:58:29Z date_updated: 2020-07-14T12:47:14Z file_id: '5985' file_name: 2018_Springer_Morri.pdf file_size: 1349914 relation: main_file file_date_updated: 2020-07-14T12:47:14Z has_accepted_license: '1' intvolume: ' 9' isi: 1 issue: '1' language: - iso: eng month: '12' oa: 1 oa_version: Published Version project: - _id: 25548C20-B435-11E9-9278-68D0E5697425 call_identifier: FP7 grant_number: '303564' name: Microbial Ion Channels for Synthetic Neurobiology - _id: 255A6082-B435-11E9-9278-68D0E5697425 call_identifier: FWF grant_number: W1232-B24 name: Molecular Drug Targets publication: Nature Communications publication_identifier: issn: - 2041-1723 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Optical functionalization of human class A orphan G-protein-coupled receptors tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 9 year: '2018' ... --- _id: '957' abstract: - lang: eng text: Small molecule biosensors based on Forster resonance energy transfer (FRET) enable small molecule signaling to be monitored with high spatial and temporal resolution in complex cellular environments. FRET sensors can be constructed by fusing a pair of fluorescent proteins to a suitable recognition domain, such as a member of the solute-binding protein (SBP) superfamily. However, naturally occurring SBPs may be unsuitable for incorporation into FRET sensors due to their low thermostability, which may preclude imaging under physiological conditions, or because the positions of their N- and C-termini may be suboptimal for fusion of fluorescent proteins, which may limit the dynamic range of the resulting sensors. Here, we show how these problems can be overcome using ancestral protein reconstruction and circular permutation. Ancestral protein reconstruction, used as a protein engineering strategy, leverages phylogenetic information to improve the thermostability of proteins, while circular permutation enables the termini of an SBP to be repositioned to maximize the dynamic range of the resulting FRET sensor. We also provide a protocol for cloning the engineered SBPs into FRET sensor constructs using Golden Gate assembly and discuss considerations for in situ characterization of the FRET sensors. alternative_title: - Methods in Molecular Biology author: - first_name: Ben full_name: Clifton, Ben last_name: Clifton - first_name: Jason full_name: Whitfield, Jason last_name: Whitfield - first_name: Inmaculada full_name: Sanchez Romero, Inmaculada id: 3D9C5D30-F248-11E8-B48F-1D18A9856A87 last_name: Sanchez Romero - first_name: Michel full_name: Herde, Michel last_name: Herde - first_name: Christian full_name: Henneberger, Christian last_name: Henneberger - first_name: Harald L full_name: Janovjak, Harald L id: 33BA6C30-F248-11E8-B48F-1D18A9856A87 last_name: Janovjak orcid: 0000-0002-8023-9315 - first_name: Colin full_name: Jackson, Colin last_name: Jackson citation: ama: 'Clifton B, Whitfield J, Sanchez-Romero I, et al. Ancestral protein reconstruction and circular permutation for improving the stability and dynamic range of FRET sensors. In: Stein V, ed. Synthetic Protein Switches. Vol 1596. Synthetic Protein Switches. Springer; 2017:71-87. doi:10.1007/978-1-4939-6940-1_5' apa: Clifton, B., Whitfield, J., Sanchez-Romero, I., Herde, M., Henneberger, C., Janovjak, H. L., & Jackson, C. (2017). Ancestral protein reconstruction and circular permutation for improving the stability and dynamic range of FRET sensors. In V. Stein (Ed.), Synthetic Protein Switches (Vol. 1596, pp. 71–87). Springer. https://doi.org/10.1007/978-1-4939-6940-1_5 chicago: Clifton, Ben, Jason Whitfield, Inmaculada Sanchez-Romero, Michel Herde, Christian Henneberger, Harald L Janovjak, and Colin Jackson. “Ancestral Protein Reconstruction and Circular Permutation for Improving the Stability and Dynamic Range of FRET Sensors.” In Synthetic Protein Switches, edited by Viktor Stein, 1596:71–87. Synthetic Protein Switches. Springer, 2017. https://doi.org/10.1007/978-1-4939-6940-1_5. ieee: B. Clifton et al., “Ancestral protein reconstruction and circular permutation for improving the stability and dynamic range of FRET sensors,” in Synthetic Protein Switches, vol. 1596, V. Stein, Ed. Springer, 2017, pp. 71–87. ista: 'Clifton B, Whitfield J, Sanchez-Romero I, Herde M, Henneberger C, Janovjak HL, Jackson C. 2017.Ancestral protein reconstruction and circular permutation for improving the stability and dynamic range of FRET sensors. In: Synthetic Protein Switches. Methods in Molecular Biology, vol. 1596, 71–87.' mla: Clifton, Ben, et al. “Ancestral Protein Reconstruction and Circular Permutation for Improving the Stability and Dynamic Range of FRET Sensors.” Synthetic Protein Switches, edited by Viktor Stein, vol. 1596, Springer, 2017, pp. 71–87, doi:10.1007/978-1-4939-6940-1_5. short: B. Clifton, J. Whitfield, I. Sanchez-Romero, M. Herde, C. Henneberger, H.L. Janovjak, C. Jackson, in:, V. Stein (Ed.), Synthetic Protein Switches, Springer, 2017, pp. 71–87. date_created: 2018-12-11T11:49:24Z date_published: 2017-03-15T00:00:00Z date_updated: 2021-01-12T08:22:13Z day: '15' department: - _id: HaJa doi: 10.1007/978-1-4939-6940-1_5 editor: - first_name: Viktor full_name: Stein, Viktor last_name: Stein intvolume: ' 1596' language: - iso: eng month: '03' oa_version: None page: 71 - 87 project: - _id: 255BFFFA-B435-11E9-9278-68D0E5697425 grant_number: RGY0084/2012 name: In situ real-time imaging of neurotransmitter signaling using designer optical sensors (HFSP Young Investigator) publication: Synthetic Protein Switches publication_identifier: issn: - '10643745' publication_status: published publisher: Springer publist_id: '6451' quality_controlled: '1' scopus_import: 1 series_title: Synthetic Protein Switches status: public title: Ancestral protein reconstruction and circular permutation for improving the stability and dynamic range of FRET sensors type: book_chapter user_id: 4435EBFC-F248-11E8-B48F-1D18A9856A87 volume: 1596 year: '2017' ... --- _id: '1549' abstract: - lang: eng text: Nature has incorporated small photochromic molecules, colloquially termed 'photoswitches', in photoreceptor proteins to sense optical cues in photo-taxis and vision. While Nature's ability to employ light-responsive functionalities has long been recognized, it was not until recently that scientists designed, synthesized and applied synthetic photochromes to manipulate many of which open rapidly and locally in their native cell types, biological processes with the temporal and spatial resolution of light. Ion channels in particular have come to the forefront of proteins that can be put under the designer control of synthetic photochromes. Photochromic ion channel controllers are comprised of three classes, photochromic soluble ligands (PCLs), photochromic tethered ligands (PTLs) and photochromic crosslinkers (PXs), and in each class ion channel functionality is controlled through reversible changes in photochrome structure. By acting as light-dependent ion channel agonists, antagonist or modulators, photochromic controllers effectively converted a wide range of ion channels, including voltage-gated ion channels, 'leak channels', tri-, tetra- and pentameric ligand-gated ion channels, and temperaturesensitive ion channels, into man-made photoreceptors. Control by photochromes can be reversible, unlike in the case of 'caged' compounds, and non-invasive with high spatial precision, unlike pharmacology and electrical manipulation. Here, we introduce design principles of emerging photochromic molecules that act on ion channels and discuss the impact that these molecules are beginning to have on ion channel biophysics and neuronal physiology. author: - first_name: Catherine full_name: Mckenzie, Catherine id: 3EEDE19A-F248-11E8-B48F-1D18A9856A87 last_name: Mckenzie - first_name: Inmaculada full_name: Sanchez Romero, Inmaculada id: 3D9C5D30-F248-11E8-B48F-1D18A9856A87 last_name: Sanchez Romero - first_name: Harald L full_name: Janovjak, Harald L id: 33BA6C30-F248-11E8-B48F-1D18A9856A87 last_name: Janovjak orcid: 0000-0002-8023-9315 citation: ama: 'Mckenzie C, Sanchez-Romero I, Janovjak HL. Flipping the photoswitch: Ion channels under light control. In: Novel Chemical Tools to Study Ion Channel Biology. Vol 869. Advances in Experimental Medicine and Biology. Springer; 2015:101-117. doi:10.1007/978-1-4939-2845-3_6' apa: 'Mckenzie, C., Sanchez-Romero, I., & Janovjak, H. L. (2015). Flipping the photoswitch: Ion channels under light control. In Novel chemical tools to study ion channel biology (Vol. 869, pp. 101–117). Springer. https://doi.org/10.1007/978-1-4939-2845-3_6' chicago: 'Mckenzie, Catherine, Inmaculada Sanchez-Romero, and Harald L Janovjak. “Flipping the Photoswitch: Ion Channels under Light Control.” In Novel Chemical Tools to Study Ion Channel Biology, 869:101–17. Advances in Experimental Medicine and Biology. Springer, 2015. https://doi.org/10.1007/978-1-4939-2845-3_6.' ieee: 'C. Mckenzie, I. Sanchez-Romero, and H. L. Janovjak, “Flipping the photoswitch: Ion channels under light control,” in Novel chemical tools to study ion channel biology, vol. 869, Springer, 2015, pp. 101–117.' ista: 'Mckenzie C, Sanchez-Romero I, Janovjak HL. 2015.Flipping the photoswitch: Ion channels under light control. In: Novel chemical tools to study ion channel biology. vol. 869, 101–117.' mla: 'Mckenzie, Catherine, et al. “Flipping the Photoswitch: Ion Channels under Light Control.” Novel Chemical Tools to Study Ion Channel Biology, vol. 869, Springer, 2015, pp. 101–17, doi:10.1007/978-1-4939-2845-3_6.' short: C. Mckenzie, I. Sanchez-Romero, H.L. Janovjak, in:, Novel Chemical Tools to Study Ion Channel Biology, Springer, 2015, pp. 101–117. date_created: 2018-12-11T11:52:39Z date_published: 2015-09-18T00:00:00Z date_updated: 2021-01-12T06:51:32Z day: '18' ddc: - '571' - '576' department: - _id: HaJa doi: 10.1007/978-1-4939-2845-3_6 file: - access_level: open_access checksum: bd1bfdf2423a0c3b6e7cabfa8b44bc0f content_type: application/pdf creator: system date_created: 2018-12-12T10:11:02Z date_updated: 2020-07-14T12:45:01Z file_id: '4854' file_name: IST-2017-839-v1+1_mckenzie.pdf file_size: 1919655 relation: main_file file_date_updated: 2020-07-14T12:45:01Z has_accepted_license: '1' intvolume: ' 869' language: - iso: eng month: '09' oa: 1 oa_version: Submitted Version page: 101 - 117 publication: Novel chemical tools to study ion channel biology publication_identifier: isbn: - 978-1-4939-2844-6 publication_status: published publisher: Springer publist_id: '5622' pubrep_id: '839' quality_controlled: '1' scopus_import: 1 series_title: Advances in Experimental Medicine and Biology status: public title: 'Flipping the photoswitch: Ion channels under light control' type: book_chapter user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 869 year: '2015' ... --- _id: '2471' abstract: - lang: eng text: The impact of disulfide bonds on protein stability goes beyond simple equilibrium thermodynamics effects associated with the conformational entropy of the unfolded state. Indeed, disulfide crosslinks may play a role in the prevention of dysfunctional association and strongly affect the rates of irreversible enzyme inactivation, highly relevant in biotechnological applications. While these kinetic-stability effects remain poorly understood, by analogy with proposed mechanisms for processes of protein aggregation and fibrillogenesis, we propose that they may be determined by the properties of sparsely-populated, partially-unfolded intermediates. Here we report the successful design, on the basis of high temperature molecular-dynamics simulations, of six thermodynamically and kinetically stabilized variants of phytase from Citrobacter braakii (a biotechnologically important enzyme) with one, two or three engineered disulfides. Activity measurements and 3D crystal structure determination demonstrate that the engineered crosslinks do not cause dramatic alterations in the native structure. The inactivation kinetics for all the variants displays a strongly non-Arrhenius temperature dependence, with the time-scale for the irreversible denaturation process reaching a minimum at a given temperature within the range of the denaturation transition. We show this striking feature to be a signature of a key role played by a partially unfolded, intermediate state/ensemble. Energetic and mutational analyses confirm that the intermediate is highly unfolded (akin to a proposed critical intermediate in the misfolding of the prion protein), a result that explains the observed kinetic stabilization. Our results provide a rationale for the kinetic-stability consequences of disulfide-crosslink engineering and an experimental methodology to arrive at energetic/structural descriptions of the sparsely populated and elusive intermediates that play key roles in irreversible protein denaturation. article_number: e70013 author: - first_name: Inmaculada full_name: Sanchez Romero, Inmaculada id: 3D9C5D30-F248-11E8-B48F-1D18A9856A87 last_name: Sanchez Romero - first_name: Antonio full_name: Ariza, Antonio last_name: Ariza - first_name: Keith full_name: Wilson, Keith last_name: Wilson - first_name: Michael full_name: Skjøt, Michael last_name: Skjøt - first_name: Jesper full_name: Vind, Jesper last_name: Vind - first_name: Leonardo full_name: De Maria, Leonardo last_name: De Maria - first_name: Lars full_name: Skov, Lars last_name: Skov - first_name: Jose full_name: Sánchez Ruiz, Jose last_name: Sánchez Ruiz citation: ama: Sanchez-Romero I, Ariza A, Wilson K, et al. Mechanism of protein kinetic stabilization by engineered disulfide crosslinks. PLoS One. 2013;8(7). doi:10.1371/journal.pone.0070013 apa: Sanchez-Romero, I., Ariza, A., Wilson, K., Skjøt, M., Vind, J., De Maria, L., … Sánchez Ruiz, J. (2013). Mechanism of protein kinetic stabilization by engineered disulfide crosslinks. PLoS One. Public Library of Science. https://doi.org/10.1371/journal.pone.0070013 chicago: Sanchez-Romero, Inmaculada, Antonio Ariza, Keith Wilson, Michael Skjøt, Jesper Vind, Leonardo De Maria, Lars Skov, and Jose Sánchez Ruiz. “Mechanism of Protein Kinetic Stabilization by Engineered Disulfide Crosslinks.” PLoS One. Public Library of Science, 2013. https://doi.org/10.1371/journal.pone.0070013. ieee: I. Sanchez-Romero et al., “Mechanism of protein kinetic stabilization by engineered disulfide crosslinks,” PLoS One, vol. 8, no. 7. Public Library of Science, 2013. ista: Sanchez-Romero I, Ariza A, Wilson K, Skjøt M, Vind J, De Maria L, Skov L, Sánchez Ruiz J. 2013. Mechanism of protein kinetic stabilization by engineered disulfide crosslinks. PLoS One. 8(7), e70013. mla: Sanchez-Romero, Inmaculada, et al. “Mechanism of Protein Kinetic Stabilization by Engineered Disulfide Crosslinks.” PLoS One, vol. 8, no. 7, e70013, Public Library of Science, 2013, doi:10.1371/journal.pone.0070013. short: I. Sanchez-Romero, A. Ariza, K. Wilson, M. Skjøt, J. Vind, L. De Maria, L. Skov, J. Sánchez Ruiz, PLoS One 8 (2013). date_created: 2018-12-11T11:57:51Z date_published: 2013-07-30T00:00:00Z date_updated: 2021-01-12T06:57:41Z day: '30' ddc: - '570' department: - _id: HaJa doi: 10.1371/journal.pone.0070013 file: - access_level: open_access checksum: c0c96cc76ed7ef0d036a31a7e33c9a37 content_type: application/pdf creator: system date_created: 2018-12-12T10:15:07Z date_updated: 2020-07-14T12:45:41Z file_id: '5124' file_name: IST-2016-414-v1+1_journal.pone.0070013.pdf file_size: 1323666 relation: main_file file_date_updated: 2020-07-14T12:45:41Z has_accepted_license: '1' intvolume: ' 8' issue: '7' language: - iso: eng month: '07' oa: 1 oa_version: Published Version publication: PLoS One publication_status: published publisher: Public Library of Science publist_id: '4430' pubrep_id: '414' quality_controlled: '1' scopus_import: 1 status: public title: Mechanism of protein kinetic stabilization by engineered disulfide crosslinks tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 8 year: '2013' ...