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-Structure paper
タイトル | High-resolution structures of kinesin on microtubules provide a basis for nucleotide-gated force-generation. |
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ジャーナル・号・ページ | Elife, Vol. 3, Page e04686, Year 2014 |
掲載日 | 2014年11月21日 |
著者 | Zhiguo Shang / Kaifeng Zhou / Chen Xu / Roseann Csencsits / Jared C Cochran / Charles V Sindelar / |
PubMed 要旨 | Microtubule-based transport by the kinesin motors, powered by ATP hydrolysis, is essential for a wide range of vital processes in eukaryotes. We obtained insight into this process by developing ...Microtubule-based transport by the kinesin motors, powered by ATP hydrolysis, is essential for a wide range of vital processes in eukaryotes. We obtained insight into this process by developing atomic models for no-nucleotide and ATP states of the monomeric kinesin motor domain on microtubules from cryo-EM reconstructions at 5-6 Å resolution. By comparing these models with existing X-ray structures of ADP-bound kinesin, we infer a mechanistic scheme in which microtubule attachment, mediated by a universally conserved 'linchpin' residue in kinesin (N255), triggers a clamshell opening of the nucleotide cleft and accompanying release of ADP. Binding of ATP re-closes the cleft in a manner that tightly couples to translocation of cargo, via kinesin's 'neck linker' element. These structural transitions are reminiscent of the analogous nucleotide-exchange steps in the myosin and F1-ATPase motors and inform how the two heads of a kinesin dimer 'gate' each other to promote coordinated stepping along microtubules. |
リンク | Elife / PubMed:25415053 / PubMed Central |
手法 | EM (らせん対称) |
解像度 | 5.0 Å |
構造データ | |
化合物 | ChemComp-GTP: ChemComp-GDP: ChemComp-ATP: ChemComp-MG: |
由来 |
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キーワード | MOTOR PROTEIN/STRUCTURAL PROTEIN / molecular motors / kinesin / myosin / microtubules / cytoskeletal motors / MOTOR PROTEIN-STRUCTURAL PROTEIN complex |