DOI: 10.1083/jcb.149.7.1503. Phosphorylation of Connexin43 on Serine368 by Protein Kinase C Regulates Gap Junctional Communication

Phosphorylation of Connexin43 on Serine368 by Protein Kinase C Regulates Gap Junctional Communication

10.1083/jcb.149.7.1503

Crossref journal-article

Rockefeller University Press

The Journal of Cell Biology (291)

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 32Pi 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.

Bibliography

Lampe, P. D., TenBroek, E. M., Burt, J. M., Kurata, W. E., Johnson, R. G., & Lau, A. F. (2000). Phosphorylation of Connexin43 on Serine368 by Protein Kinase C Regulates Gap Junctional Communication. The Journal of Cell Biology, 149(7), 1503â1512.

Authors 6

Paul D. Lampe (first)
Erica M. TenBroek (additional)
Janis M. Burt (additional)
Wendy E. Kurata (additional)
Ross G. Johnson (additional)
Alan F. Lau (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 12:45 p.m.)
Deposited	2 years, 1 month ago (July 28, 2023, 10:15 p.m.)
Indexed	4 weeks, 2 days ago (Aug. 5, 2025, 8:58 a.m.)
Issued	25 years, 2 months ago (June 26, 2000)
Published	25 years, 2 months ago (June 26, 2000)
Published Online	25 years, 2 months ago (June 26, 2000)
Published Print	25 years, 2 months ago (June 26, 2000)

Funders 0

None

BibTeX

@article{Lampe_2000, title={Phosphorylation of Connexin43 on Serine368 by Protein Kinase C Regulates Gap Junctional Communication}, volume={149}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.149.7.1503}, DOI={10.1083/jcb.149.7.1503}, number={7}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Lampe, Paul D. and TenBroek, Erica M. and Burt, Janis M. and Kurata, Wendy E. and Johnson, Ross G. and Lau, Alan F.}, year={2000}, month=jun, pages={1503–1512} }

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  "abstract": "<jats:p>Phorbol esters (e.g., TPA) activate protein kinase C (PKC), increase connexin43 (Cx43) phosphorylation, and decrease cell\u2013cell communication via gap junctions in many cell types. We asked whether PKC directly phosphorylates and regulates Cx43. Rat epithelial T51B cells metabolically labeled with 32Pi 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\u2212/\u2212 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 \u223c50-pS channel events and a concomitant loss of \u223c100-pS channel events. This change to \u223c50-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.</jats:p>",
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