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Kinesin-5-Tubulin Complex with AMPPNPKinesin-5-Tubulin Complex with AMPPNP
Structural highlights
FunctionTBA1D_BOVIN Tubulin is the major constituent of microtubules. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha chain (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedKinesin-5 (K5) motors are important components of the microtubule (MT)-based cell division machinery and are targets for small-molecule inhibitors currently in cancer clinical trials. However, the nature of the K5-MT interaction and the regulatory mechanisms that control it remain unclear. Using cryo-electron microscopy and image processing, we calculated the structure of a K5 motor bound to MTs at 9 A resolution, providing insight into this important interaction. Our reconstruction reveals the K5 motor domain in an ATP-like conformation in which MT binding induces the conserved nucleotide-sensing switch I and II loops to form a compact subdomain around the bound nucleotide. Our reconstruction also reveals a novel conformation for the K5-specific drug-binding loop 5, suggesting a possible role for it in switching K5s between force generation and diffusional modes of MT binding. Our data thus shed light on regulation of the interaction between spindle components important for chromosome segregation. 9-Angstrom structure of a microtubule-bound mitotic motor.,Bodey AJ, Kikkawa M, Moores CA J Mol Biol. 2009 May 1;388(2):218-24. Epub 2009 Mar 10. PMID:19285086[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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