Auxin-binding protein 1 (ABP1) was discovered nearly 40 years ago and was shown to be essential for plant development and morphogenesis, but its mode of action remains unclear. Here, we report that the plasma membrane-localized transmembrane kinase (TMK) receptor-like kinases interact with ABP1 and transduce auxin signal to activate plasma membrane-associated ROPs [Rho-like guanosine triphosphatases (GTPase) from plants], leading to changes in the cytoskeleton and the shape of leaf pavement cells in Arabidopsis. The interaction between ABP1 and TMK at the cell surface is induced by auxin and requires ABP1 sensing of auxin. These findings show that TMK proteins and ABP1 form a cell surface auxin perception complex that activates ROP signaling pathways, regulating nontranscriptional cytoplasmic responses and associated fundamental processes.
Supported by the intramural research program of the National Institute of Arthritis and Musculoskeletal and Skin Diseases and by its Laboratory Animal Care and Use Section and Flow Cytometry Group, Office of Science and Technology
1025 - 1028
Xu T, Dai N, Chen J, et al. Cell surface ABP1-TMK auxin sensing complex activates ROP GTPase signaling. Science. 2014;343(6174):1025-1028. doi:10.1126/science.1245125
Xu, T., Dai, N., Chen, J., Nagawa, S., Cao, M., Li, H., … Yang, Z. (2014). Cell surface ABP1-TMK auxin sensing complex activates ROP GTPase signaling. Science, 343(6174), 1025–1028. https://doi.org/10.1126/science.1245125
Xu, Tongda, Ning Dai, Jisheng Chen, Shingo Nagawa, Min Cao, Hongjiang Li, Zimin Zhou, et al. “Cell Surface ABP1-TMK Auxin Sensing Complex Activates ROP GTPase Signaling.” Science 343, no. 6174 (2014): 1025–28. https://doi.org/10.1126/science.1245125.
T. Xu et al., “Cell surface ABP1-TMK auxin sensing complex activates ROP GTPase signaling,” Science, vol. 343, no. 6174, pp. 1025–1028, 2014.
Xu T, Dai N, Chen J, Nagawa S, Cao M, Li H, Zhou Z, Chen X, De Rycke R, Rakusová H, Wang W, Jones A, Friml J, Patterson S, Bleecker A, Yang Z. 2014. Cell surface ABP1-TMK auxin sensing complex activates ROP GTPase signaling. Science. 343(6174), 1025–1028.
Xu, Tongda, et al. “Cell Surface ABP1-TMK Auxin Sensing Complex Activates ROP GTPase Signaling.” Science, vol. 343, no. 6174, American Association for the Advancement of Science, 2014, pp. 1025–28, doi:10.1126/science.1245125.
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