Diverse balances of tubulin interactions and shape change drive and interrupt microtubule depolymerization

Bollinger, Jonathan A.; Stevens, Mark J.

doi:10.1039/C9SM01323G

Diverse balances of tubulin interactions and shape change drive and interrupt microtubule depolymerization

Journal Article · Tue Oct 08 04:00:00 EDT 2019 · Soft Matter

DOI:https://doi.org/10.1039/C9SM01323G· OSTI ID:1595025

^[1]; Stevens, Mark J. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Microtubules are stiff biopolymers that self-assemble via the addition of GTP-tubulin (αβ-dimer bound to GTP), but hydrolysis of GTP- to GDP-tubulin within the tubules destabilizes them toward catastrophically-fast depolymerization. The molecular mechanisms and features of the individual tubulin proteins that drive such behavior are still not well-understood. Using molecular dynamics simulations of whole microtubules built from a coarse-grained model of tubulin, we demonstrate how conformational shape changes (i.e., deformations) in subunits that frustrate tubulin–tubulin binding within microtubules drive depolymerization of stiff tubules via unpeeling “ram's horns” consistent with experiments. We calculate the sensitivity of these behaviors to the length scales and strengths of binding attractions and varying degrees of binding frustration driven by subunit shape change, and demonstrate that the dynamic instability and mechanical properties of microtubules can be produced based on either balanced or imbalanced strengths of lateral and vertical binding attractions. Finally, we show how catastrophic depolymerization can be interrupted by small regions of the microtubule containing undeformed dimers, corresponding to incomplete lattice hydrolysis. Finally, the results demonstrate a mechanism by which microtubule rescue can occur.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1595025

Alternate ID(s):: OSTI ID: 1569780

Report Number(s):: SAND--2019-15010J; 682259

Journal Information:: Soft Matter, Journal Name: Soft Matter Journal Issue: 40 Vol. 15; ISSN SMOABF; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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