Structure of rat gamma-tubulin and its binding to HP33. |
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Authors: | T Nakadai N Okada Y Makino T Tamura |
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Institution: | Department of Biology, Faculty of Science, Chiba University, Japan. |
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Abstract: | Gamma-tubulin is localized at the microtubule organizing center and is thought to participate in the organizing of the microtubule network. In this study, we isolated a cDNA of rat gamma-tubulin. The rat gamma-tubulin cDNA encoded 451 amino acids, the same number as that of its counterpart in other vertebrates, and its structure was found to be highly conserved in vertebrates. In a previous work, we identified HP33 (hepatocarcinogenesis- and hepatocellular proliferation-related 33-kDa protein) that was localized at the centrosome of hepatic cells and that exhibited MAP-like activity. In vitro GST pull-down assay using highly purified recombinant HP33 and bacterially expressed gamma-tubulin demonstrated that HP33 bound to gamma-tubulin directly. These results suggest that HP33 is localized at the centrosome via association with both the microtubule and its minus end-specific component, gamma-tubulin. |
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Keywords: | -tubulin" target="_blank">gif" ALT="{gamma}" BORDER="0">-tubulin tubulin family centrosome HP33 |
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