TY - JOUR
T1 - Structural state recognition facilitates tip tracking of eb1 at growing microtubule ends
AU - Reid, Taylor A.
AU - Coombes, Courtney
AU - Mukherjee, Soumya
AU - Goldblum, Rebecca R.
AU - White, Kyle
AU - Parmar, Sneha
AU - McClellan, Mark
AU - Zanic, Marija
AU - Courtemanche, Naomi
AU - Gardner, Melissa K.
N1 - Publisher Copyright:
© Reid et al.
PY - 2019/9
Y1 - 2019/9
N2 - The microtubule binding protein EB1 specifically targets the growing ends of microtubules in cells, where EB1 facilitates the interactions of cellular proteins with microtubule plus-ends. Microtubule end targeting of EB1 has been attributed to high-affinity binding of EB1 to GTP-tubulin that is present at growing microtubule ends. However, our 3D single-molecule diffusion simulations predicted a ~ 6000% increase in EB1 arrivals to open, tapered microtubule tip structures relative to closed lattice conformations. Using quantitative fluorescence, single-molecule, and electron microscopy experiments, we found that the binding of EB1 onto opened, structurally disrupted microtubules was dramatically increased relative to closed, intact microtubules, regardless of hydrolysis state. Correspondingly, in cells, the blunting of growing microtubule plus-ends by Vinblastine was correlated with reduced EB1 targeting. Together, our results suggest that microtubule structural recognition, based on a fundamental diffusion-limited binding model, facilitates the tip tracking of EB1 at growing microtubule ends.
AB - The microtubule binding protein EB1 specifically targets the growing ends of microtubules in cells, where EB1 facilitates the interactions of cellular proteins with microtubule plus-ends. Microtubule end targeting of EB1 has been attributed to high-affinity binding of EB1 to GTP-tubulin that is present at growing microtubule ends. However, our 3D single-molecule diffusion simulations predicted a ~ 6000% increase in EB1 arrivals to open, tapered microtubule tip structures relative to closed lattice conformations. Using quantitative fluorescence, single-molecule, and electron microscopy experiments, we found that the binding of EB1 onto opened, structurally disrupted microtubules was dramatically increased relative to closed, intact microtubules, regardless of hydrolysis state. Correspondingly, in cells, the blunting of growing microtubule plus-ends by Vinblastine was correlated with reduced EB1 targeting. Together, our results suggest that microtubule structural recognition, based on a fundamental diffusion-limited binding model, facilitates the tip tracking of EB1 at growing microtubule ends.
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U2 - 10.7554/eLife.48117
DO - 10.7554/eLife.48117
M3 - Article
C2 - 31478831
AN - SCOPUS:85072133145
SN - 2050-084X
VL - 8
JO - eLife
JF - eLife
M1 - e48117
ER -