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| Content Provider | PubMed Central |
|---|---|
| Author | Curtis, B. M. Catterall, W. A. |
| Abstract | Physiological studies indicate that voltage-sensitive calcium channels are regulated by cAMP and protein phosphorylation. The calcium antagonist receptor of the voltage-sensitive calcium channel from transverse-tubule membranes consists of three subunits, designated alpha, beta, and gamma. The catalytic subunit of cAMP-dependent protein kinase phosphorylates both the alpha and beta subunits of the purified receptor at a rate and extent that suggests they are potential physiological substrates of this enzyme. The phosphorylation of the alpha and beta subunits in transverse-tubule membranes was analyzed by two-dimensional gel electrophoresis. In intact transverse-tubule membranes, the alpha subunit is not significantly phosphorylated. However, the beta subunit, identified by its Mr, pI, and binding to wheat germ agglutinin-Sepharose, was one of the substrates selectively phosphorylated by cAMP-dependent protein kinase in transverse-tubule membranes. These results suggest that cAMP-dependent phosphorylation of the beta subunit of the calcium antagonist receptor may be an important regulatory mechanism for calcium channel function. |
| Starting Page | 2528 |
| File Format | |
| ISSN | 10916490 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 82 |
| Language | English |
| Publisher Date | 1985-04-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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