Characterization of a Drosophila centrosome protein CP309 that shares homology with Kendrin and CG-NAP.
The centrosome in animal cells provides a major microtubule-nucleating site that regulates the microtubule cytoskeleton temporally and spatially throughout the cell cycle. We report the identification in Drosophila melanogaster of a large coiled-coil centrosome protein that can bind to calmodulin. Biochemical studies reveal that this novel Drosophila centrosome protein, centrosome protein of 309 kDa (CP309), cofractionates with the gamma-tubulin ring complex and the centrosome-complementing activity. We show that CP309 is required for microtubule nucleation mediated by centrosomes and that it interacts with the gamma-tubulin small complex. These findings suggest that the microtubule-nucleating activity of the centrosome requires the function of CP309.
Kawaguchi
Shin-ichi
S
Department of Embryology, Carnegie Institution of Washington and Howard Hughes Medical Institute, Baltimore, Maryland 21210, USA.
Zheng
Yixian
Y
D000595:Amino Acid Sequence; D000818:Animals; D002147:Calmodulin / Q000378:metabolism*; D002148:Calmodulin-Binding Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics*; D002453:Cell Cycle; D018385:Centrosome; D003001:Cloning, Molecular; D003599:Cytoskeleton / Q000378:metabolism; D029721:Drosophila Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000196:embryology / Q000378:metabolism*; D004625:Embryo, Nonmammalian / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D008870:Microtubules / Q000378:metabolism; D008969:Molecular Sequence Data; D011485:Protein Binding; D017386:Sequence Homology, Amino Acid; D014404:Tubulin / Q000378:metabolism
D002147:Calmodulin; D002148:Calmodulin-Binding Proteins; D002352:Carrier Proteins; D029721:Drosophila Proteins; C483309:Plp protein, Drosophila; D014404:Tubulin; C410004:kendrin