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Structural differences between yeast and mammalian microtubules revealed by cryo-EM

Journal Article · · Journal of Cell Biology
 [1];  [2];  [3];  [4];  [4];  [5];  [2];  [6]
  1. Univ. of California, Berkeley, CA (United States). Biophysics Graduate Group; DOE/OSTI
  2. Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Biophysics; Univ. of Texas Southwestern Medical Center, Dallas, TX (United States). Dept. of Biochemistry
  3. Univ. of California, Berkeley, CA (United States). Molecular and Cell Biology Graduate Program
  4. Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division
  5. Univ. of Duisburg-Essen, Essen (Germany). Dept. of Molecular Genetics, Center for Medical Biotechnology
  6. Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.; Univ. of California, Berkeley, CA (United States). Dept. of Molecular Biology and California Inst. for Quantitative Biosciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Biophysics and Integrated Bioimaging Division
Microtubules are polymers of αβ-tubulin heterodimers essential for all eukaryotes. Despite sequence conservation, there are significant structural differences between microtubules assembled in vitro from mammalian or budding yeast tubulin. Yeast MTs were not observed to undergo compaction at the interdimer interface as seen for mammalian microtubules upon GTP hydrolysis. Lack of compaction might reflect slower GTP hydrolysis or a different degree of allosteric coupling in the lattice. The microtubule plus end–tracking protein Bim1 binds yeast microtubules both between αβ-tubulin heterodimers, as seen for other organisms, and within tubulin dimers, but binds mammalian tubulin only at interdimer contacts. At the concentrations used in cryo-electron microscopy, Bim1 causes the compaction of yeast microtubules and induces their rapid disassembly. In conclusion, our studies demonstrate structural differences between yeast and mammalian microtubules that likely underlie their differing polymerization dynamics. These differences may reflect adaptations to the demands of different cell size or range of physiological growth temperatures.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Institutes of Health (NIH); National Science Foundation (NSF); USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1393251
Journal Information:
Journal of Cell Biology, Journal Name: Journal of Cell Biology Journal Issue: 9 Vol. 216; ISSN 0021-9525
Publisher:
Rockefeller University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

Selection and Characterization of Artificial Proteins Targeting the Tubulin α Subunit journal March 2019
Nucleotide– and Mal3-dependent changes in fission yeast microtubules suggest a structural plasticity view of dynamics journal December 2017
Microtubule structure by cryo-EM: snapshots of dynamic instability journal October 2018
A microtubule bestiary: structural diversity in tubulin polymers journal November 2017
Long-range, through-lattice coupling improves predictions of microtubule catastrophe journal June 2019
Regulation of microtubule dynamic instability by the carboxy-terminal tail of β-tubulin journal April 2018
Design principles of a microtubule polymerase journal June 2018
Structural model for differential cap maturation at growing microtubule ends journal March 2020
Direct Observation of Individual Tubulin Dimers Binding to Growing Microtubules journal February 2019
Separating the effects of nucleotide and EB binding on microtubule structure journal June 2018
Direct observation of individual tubulin dimers binding to growing microtubules journal February 2019
Structural and functional differences between porcine brain and budding yeast microtubules journal January 2018
A neurodevelopmental TUBB2B β-tubulin mutation impairs Bim1 (yeast EB1)-dependent spindle positioning journal January 2019
Spatial positioning of EB family proteins at microtubule tips involves distinct nucleotide-dependent binding properties journal September 2018

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