Cited by 194Microtubule and mitosis dynamicsForce Microscopy Techniques and ApplicationsProtein Structure and Dynamics

Distinguishing Inchworm and Hand-Over-Hand Processive Kinesin Movement by Neck Rotation Measurements

Hua, Wei, Chung, Johnson, Gelles, Jeff·2002·Science

Abstract

The motor enzyme kinesin makes hundreds of unidirectional 8-nanometer steps without detaching from or freely sliding along the microtubule on which it moves. We investigated the kinesin stepping mechanism by immobilizing a Drosophila kinesin derivative through the carboxyl-terminal end of the neck coiled-coil domain and measuring orientations of microtubules moved by single enzyme molecules at submicromolar adenosine triphosphate concentrations. The kinesin-mediated microtubule-surface linkage was sufficiently torsionally stiff (>/=2.0 +/- 0.9 x 10(-20) Newton meters per radian2) that stepping by the hypothesized symmetric hand-over-hand mechanism would produce 180 degree rotations of the microtubule relative to the immobilized kinesin neck. In fact, there were no rotations, a finding that is inconsistent with symmetric hand-over-hand movement. An alternative "inchworm" mechanism is consistent with our experimental results.

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Crossref · 10.1126/science.1063089

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  • In the inchworm model, the leading motor is always leading, the trailing motor is always trailing, and one motor remains enzymatically inactive throughout a processive run.

    “In this model, the leading motor is always leading, the trailing motor is always trailing, and one motor remains enzymatically inactive throughout a processive run.”

    From Stepping and Stretching (2003) · cites this paper as [33]

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Authors
Hua, W., Chung, J., & Gelles, J.
Affiliations
  • Biophysics and Structural Biology Program,
  • Brandeis University (US)
Corresponding author
Gelles, Jeff
Venue
Science
Published
2002-02
Volume
295
Issue
5556
Pages
844-848
ISSN
  • 0036-8075 (ISSN-L)
  • 1095-9203
OpenAlex
W1589896765
Cited by
194
References
0
Citations by year
2025: 3 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 3 · 2020: 4 · 2019: 4 · 2018: 5 · 2017: 4 · 2016: 7 · 2015: 3 · 2014: 10 · 2013: 4 · 2012: 14
FWCI
7.66
Type
journal article
Language
en
Open access
closed
Locations
  • Science (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Force Microscopy Techniques and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
kinesin, inchworm mechanism, hand-over-hand mechanism, torsional stiffness, microtubule sliding
MeSH terms
Adenosine Triphosphate, Adenylyl Imidodiphosphate, Animals, Binding Sites, Catalysis, Drosophila, Enzymes, Immobilized, Microtubules, Models, Biological, Movement, Rotation, Kinesins, Protein Structure, Tertiary, Dimerization, Streptavidin, Molecular Motor Proteins

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