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Eg5 - New allosteric binding site
Structural highlights
DiseaseKIF11_HUMAN Defects in KIF11 are the cause of microcephaly with or without chorioretinopathy, lymphedema, or mental retardation (MCLMR) [MIM:152950. An autosomal dominant disorder that involves an overlapping but variable spectrum of central nervous system and ocular developmental anomalies. Microcephaly ranges from mild to severe and is often associated with mild to moderate developmental delay and a characteristic facial phenotype with upslanting palpebral fissures, broad nose with rounded tip, long philtrum with thin upper lip, prominent chin, and prominent ears. Chorioretinopathy is the most common eye abnormality, but retinal folds, microphthalmia, and myopic and hypermetropic astigmatism have also been reported, and some individuals have no overt ocular phenotype. Congenital lymphedema, when present, is typically confined to the dorsa of the feet, and lymphoscintigraphy reveals the absence of radioactive isotope uptake from the webspaces between the toes.[1] FunctionKIF11_HUMAN Motor protein required for establishing a bipolar spindle. Blocking of KIF11 prevents centrosome migration and arrest cells in mitosis with monoastral microtubule arrays.[2] Publication Abstract from PubMedHuman kinesin Eg5 is a target for drug development in cancer chemotherapy with compounds in phase II clinical trials. These agents bind to a well-characterized allosteric pocket involving the loop L5 region, a structural element in kinesin-5 family members thought to provide inhibitor specificity. Using X-ray crystallography, kinetic and biophysical methods, we have identified and characterized a distinct and novel allosteric pocket in Eg5 able to bind inhibitors with nanomolar Kd. This new pocket is formed by key structural elements thought to be pivotal for force generation in kinesins and may represent a novel site for therapeutic intervention in this increasingly well-validated drug target. Structural Insights Into a Unique Inhibitor Binding Pocket in Kinesin Spindle Protein.,Ulaganathan V, Talapatra SK, Rath O, Pannifer AD, Hackney DD, Kozielski F J Am Chem Soc. 2013 Jan 10. PMID:23305346[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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