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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lampe, P. D. Burt, J. M. Lau, A. F. Tenbroek, E. M. Johnson, R. G. Kurata, W. E. |
| Description | Author Affiliation: Lampe PD ( Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, USA. plampe@fhcrc.org) |
| Abstract | Phorbol esters (e.g., TPA) activate protein kinase C (PKC), increase connexin43 (Cx43) phosphorylation, and decrease cell–cell communication via gap junctions in many cell types. We asked whether PKC directly phosphorylates and regulates Cx43. Rat epithelial T51B cells metabolically labeled with $^{32}P_{i}$ yielded two-dimensional phosphotryptic maps of Cx43 with several phosphopeptides that increased in intensity upon TPA treatment. One of these peptides comigrated with the major phosphopeptide observed after PKC phosphorylation of immunoaffinity-purified Cx43. Purification of this comigrating peptide and subsequent sequencing indicated that the phosphorylated serine was residue 368. To pursue the functional importance of phosphorylation at this site, fibroblasts from $Cx43^{−/−}$ mice were transfected with either wild-type (Cx43wt) or mutant Cx43 (Cx43-S368A). Intercellular dye transfer studies revealed different responses to TPA and were followed by single channel analyses. TPA stimulation of T51B cells or Cx43wt-transfected fibroblasts caused a large increase in the relative frequency of ∼50-pS channel events and a concomitant loss of ∼100-pS channel events. This change to ∼50-pS events was absent when cells transfected with Cx43-S368A were treated with TPA. These data strongly suggest that PKC directly phosphorylates Cx43 on S368 in vivo, which results in a change in single channel behavior that contributes to a decrease in intercellular communication. |
| ISSN | 00219525 |
| e-ISSN | 15408140 |
| Journal | The Journal of Cell Biology |
| Issue Number | 7 |
| Volume Number | 149 |
| Language | English |
| Publisher | Rockefeller University Press (United States) |
| Publisher Date | 2000-06-26 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Communication Physiology Connexin 43 Metabolism Gap Junctions Protein Kinase C Animals Cells, Cultured Mice Mice, Knockout Mutagenesis, Site-Directed Neoplasms Physiopathology Phosphorylation Sequence Analysis, Protein Serine 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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