NDLI: Estimates of lateral and longitudinal bond energies within the microtubule lattice.

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Estimates of lateral and longitudinal bond energies within the microtubule lattice.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Odde, David J. Cassimeris, Lynne Vanburen, Vincent
Description	Author Affiliation: VanBuren V ( Department of Biological Sciences, Lehigh University, 111 Research Drive, Bethlehem, PA 18015, USA.);
Abstract	We developed a stochastic model of microtubule (MT) assembly dynamics that estimates tubulin-tubulin bond energies, mechanical energy stored in the lattice dimers, and the size of the tubulin-GTP cap at MT tips. First, a simple assembly/disassembly state model was used to screen possible combinations of lateral bond energy (DeltaG(Lat)) and longitudinal bond energy (DeltaG(Long)) plus the free energy of immobilizing a dimer in the MT lattice (DeltaG(S)) for rates of MT growth and shortening measured experimentally. This analysis predicts DeltaG(Lat) in the range of -3.2 to -5.7 k(B)T and DeltaG(Long) plus DeltaG(S) in the range of -6.8 to -9.4 k(B)T. Based on these estimates, the energy of conformational stress for a single tubulin-GDP dimer in the lattice is 2.1-2.5 k(B)T. Second, we studied how tubulin-GTP cap size fluctuates with different hydrolysis rules and show that a mechanism of directly coupling subunit addition to hydrolysis fails to support MT growth, whereas a finite hydrolysis rate allows growth. By adding rules to mimic the mechanical constraints present at the MT tip, the model generates tubulin-GTP caps similar in size to experimental estimates. Finally, by combining assembly/disassembly and cap dynamics, we generate MT dynamic instability with rates and transition frequencies similar to those measured experimentally. Our model serves as a platform to examine GTP-cap dynamics and allows predictions of how MT-associated proteins and other effectors alter the energetics of MT assembly.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	9
Volume Number	99
Language	English
Publisher	National Academy of Sciences
Publisher Date	2002-05-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Guanosine Diphosphate Chemistry Microtubules Dimerization Guanosine Triphosphate Metabolism Hydrolysis Kinetics Models, Theoretical Monte Carlo Method Protein Conformation Thermodynamics Time Factors Tubulin Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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