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Ternary complex of Kif2A-bound tandem tubulin heterodimers represents a kinesin-13-mediated microtubule depolymerization reaction intermediate
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Ternary complex of Kif2A-bound tandem tubulin heterodimers represents a kinesin-13-mediated microtubule depolymerization reaction intermediate
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Ternary complex of Kif2A-bound tandem tubulin heterodimers represents a kinesin-13-mediated microtubule depolymerization reaction intermediate
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Journal Article
Ternary complex of Kif2A-bound tandem tubulin heterodimers represents a kinesin-13-mediated microtubule depolymerization reaction intermediate
2018
Overview
Kinesin-13 proteins are major microtubule (MT) regulatory factors that catalyze removal of tubulin subunits from MT ends. The class-specific “neck” and loop 2 regions of these motors are required for MT depolymerization, but their contributing roles are still unresolved because their interactions with MT ends have not been observed directly. Here we report the crystal structure of a catalytically active kinesin-13 monomer (Kif2A) in complex with two bent αβ-tubulin heterodimers in a head-to-tail array, providing a view of these interactions. The neck of Kif2A binds to one tubulin dimer and the motor core to the other, guiding insertion of the KVD motif of loop 2 in between them. AMPPNP-bound Kif2A can form stable complexes with tubulin in solution and trigger MT depolymerization. We also demonstrate the importance of the neck in modulating ATP turnover and catalytic depolymerization of MTs. These results provide mechanistic insights into the catalytic cycles of kinesin-13.
The kinesin-13 family of microtubule (MT) depolymerases are major regulators of MT dynamics. Here the authors provide insights into the MT depolymerization mechanism by solving the crystal structure of a kinesin-13 monomer (Kif2A) in complex with two bent αβ-tubulin heterodimers.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 631/535
/ 631/80
/ 82/16
/ 82/29
/ Adenosine Triphosphate - metabolism
/ Animals
/ Cattle
/ Dimers
/ Enzymes
/ Humanities and Social Sciences
/ Humans
/ Kinesin
/ Motors
/ Neck
/ Polymers
/ Protein Structure, Secondary
/ Proteins
/ Recombinant Fusion Proteins - metabolism
/ Science
/ Tubulin
