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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mikami, A. Paschal, B. M. Pfister, K. K. Vallee, R. B. |
| Description | Author Affiliation: Paschal BM ( Cell Biology Group, Worcester Foundation for Experimental Biology, Shrewsbury, Massachusetts 01545.) |
| Abstract | In previous work we found cytoplasmic dynein to be a complex of two catalytic heavy chains and at least seven co-purifying polypeptides of unknown function. The most prominent of these is a 74-kD electrophoretic species which can be resolved as two to three bands by SDS-PAGE. We have now selected a series of overlapping rat brain cDNAs encoding the 74-kD species. The deduced sequence of a full-length cDNA predicts a 72,753 D polypeptide which includes the amino acid sequences of nine peptides determined by NH2-terminal microsequencing. PCR performed on first strand rat brain cDNA together with the sequence of a partially matching tryptic peptide indicated the existence of at least three isoforms of the 74-kD cytoplasmic dynein subunit. Comparison with known sequences revealed that the carboxyl-terminal half of the polypeptide is 26.4% identical and 47.7% similar to the product of the Chlamydomonas ODA6 gene, a 70-kD intermediate chain of flagellar outer arm dynein. Immunoblot analysis with a monoclonal antibody to the 74-kD species indicated a widespread tissue distribution, as expected for a cytoplasmic dynein subunit. Nonetheless, the antibody recognized a 67-kD species in ram sperm flagella and pig tracheal cilia, supporting the existence of distinct but related cytoplasmic and axonemal polypeptides in mammals. In view of evidence for a role for the ODA6 gene product in anchoring flagellar dynein to the A subfiber microtubule in the axoneme, we predict an analogous role for the 74-kD polypeptide, perhaps in mediating the interaction of cytoplasmic dynein with membranous organelles and kinetochores. |
| ISSN | 00219525 |
| e-ISSN | 15408140 |
| Journal | The Journal of Cell Biology |
| Issue Number | 5 |
| Volume Number | 118 |
| Language | English |
| Publisher | Rockefeller University Press (United States) |
| Publisher Date | 1992-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cytoplasm Enzymology Dyneins Chemistry Flagella Amino Acid Sequence Animals Blotting, Western Brain DNA Genetics Immunology Isolation & Purification Molecular Sequence Data RNA, Messenger Rats, Inbred Strains Sperm Tail Testis Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine |
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