title: Identification of a human centrosomal calmodulin-binding protein that shares homology with pericentrin.
abstract: Eukaryotic chromosome segregation depends on the mitotic spindle apparatus, a bipolar array of microtubules nucleated from centrosomes. Centrosomal microtubule nucleation requires attachment of gamma-tubulin ring complexes to a salt-insoluble centrosomal core, but the factor(s) underlying this attachment remains unknown. In budding yeast, this attachment is provided by the coiled-coil protein Spc110p, which links the yeast gamma-tubulin complex to the core of the yeast centrosome. Here, we show that the large coiled-coil protein kendrin is a human orthologue of Spc110p. We identified kendrin by its C-terminal calmodulin-binding site, which shares homology with the Spc110p calmodulin-binding site. Kendrin localizes specifically to centrosomes throughout the cell cycle. N-terminal regions of kendrin share significant sequence homology with pericentrin, a previously identified murine centrosome component known to interact with gamma-tubulin. In mitotic human breast carcinoma cells containing abundant centrosome-like structures, kendrin is found only at centrosomes associated with spindle microtubules.
authors.affiliation: Program in Molecular and Cellular Biology, Department of Pathology, University of Washington, Seattle, WA 98195, USA.
authors.forename: M R
authors.initials: MR
authors.lastname: Flory
authors.forename: M J
authors.initials: MJ
authors.lastname: Moser
authors.forename: R J
authors.initials: RJ
authors.lastname: Monnat
authors.forename: T N
authors.initials: TN
authors.lastname: Davis
mesh_terms: D000941:Antigens / Q000737:chemistry*; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002147:Calmodulin / Q000378:metabolism*; D002148:Calmodulin-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification*; D002277:Carcinoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D018385:Centrosome / Q000378:metabolism*; D003598:Cytoskeletal Proteins; D005347:Fibroblasts / Q000378:metabolism; D005656:Fungal Proteins / Q000737:chemistry; D015723:Gene Library; D006801:Humans; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification*; D009687:Nuclear Proteins / Q000737:chemistry; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D008941:Spindle Apparatus / Q000378:metabolism; D014404:Tubulin / Q000378:metabolism
chemical_list: D000941:Antigens; D002147:Calmodulin; D002148:Calmodulin-Binding Proteins; D003598:Cytoskeletal Proteins; D005656:Fungal Proteins; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011993:Recombinant Fusion Proteins; C073277:SPC110 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; D014404:Tubulin; C410004:kendrin; C086178:pericentrin