Rickman, Jamie; Düllberg, Christian FIST Austria ; Cade, Nicholas; Griffin, Lewis; Surrey, Thomas
Growing microtubules are protected from depolymerization by the presence of a GTP or GDP/Pi cap. End-binding proteins of the EB1 family bind to the stabilizing cap, allowing monitoring of its size in real time. The cap size has been shown to correlate with instantaneous microtubule stability. Here we have quantitatively characterized the properties of cap size fluctuations during steadystate growth and have developed a theory predicting their timescale and amplitude from the kinetics of microtubule growth and cap maturation. In contrast to growth speed fluctuations, cap size fluctuations show a characteristic timescale, which is defined by the lifetime of the cap sites. Growth fluctuations affect the amplitude of cap size fluctuations; however, cap size does not affect growth speed, indicating that microtubules are far from instability during most of their time of growth. Our theory provides the basis for a quantitative understanding of microtubule stability fluctuations during steady-state growth.
We thank Philippe Cluzel for helpful discussions and Gunnar Pruessner for data analysis advice. This work was supported by the Francis Crick Institute, which receives its core funding from Cancer Research UK Grant FC001163, Medical Research Council Grant FC001163, and Wellcome Trust Grant FC001163. This work was also supported by European Research Council Advanced Grant Project 323042 (to C.D. and T.S.).
3427 - 3432
Rickman J, Düllberg CF, Cade N, Griffin L, Surrey T. Steady state EB cap size fluctuations are determined by stochastic microtubule growth and maturation. PNAS. 2017;114(13):3427-3432. doi:10.1073/pnas.1620274114
Rickman, J., Düllberg, C. F., Cade, N., Griffin, L., & Surrey, T. (2017). Steady state EB cap size fluctuations are determined by stochastic microtubule growth and maturation. PNAS. National Academy of Sciences. https://doi.org/10.1073/pnas.1620274114
Rickman, Jamie, Christian F Düllberg, Nicholas Cade, Lewis Griffin, and Thomas Surrey. “Steady State EB Cap Size Fluctuations Are Determined by Stochastic Microtubule Growth and Maturation.” PNAS. National Academy of Sciences, 2017. https://doi.org/10.1073/pnas.1620274114.
J. Rickman, C. F. Düllberg, N. Cade, L. Griffin, and T. Surrey, “Steady state EB cap size fluctuations are determined by stochastic microtubule growth and maturation,” PNAS, vol. 114, no. 13. National Academy of Sciences, pp. 3427–3432, 2017.
Rickman J, Düllberg CF, Cade N, Griffin L, Surrey T. 2017. Steady state EB cap size fluctuations are determined by stochastic microtubule growth and maturation. PNAS. 114(13), 3427–3432.
Rickman, Jamie, et al. “Steady State EB Cap Size Fluctuations Are Determined by Stochastic Microtubule Growth and Maturation.” PNAS, vol. 114, no. 13, National Academy of Sciences, 2017, pp. 3427–32, doi:10.1073/pnas.1620274114.
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