LAT palmitoylation: its essential role in membrane microdomain targeting and tyrosine phosphorylation during T cell activation.

Published

Journal Article

The linker molecule LAT is a critical substrate of the tyrosine kinases activated upon TCR engagement. Phosphorylated LAT binds Grb2, PLC-gamma1, and other signaling molecules. We demonstrate that human LAT is palmitoylated and that palmitoylated LAT predominantly localizes into glycolipid-enriched microdomains (GEMs). Although the LAT transmembrane domain is sufficient for membrane localization, palmitoylation at C26 and C29 is essential for efficient partitioning into GEMs. LAT palmitoylation is necessary for its tyrosine phosphorylation. After T cell activation, most tyrosine-phosphorylated LAT molecules and a fraction of PLC-gamma1 and other signaling molecules are present in GEMs. LAT is central to T cell activation and is a novel linker molecule shown to require targeting to membrane microdomains for signaling.

Full Text

Duke Authors

Cited Authors

  • Zhang, W; Trible, RP; Samelson, LE

Published Date

  • August 1998

Published In

Volume / Issue

  • 9 / 2

Start / End Page

  • 239 - 246

PubMed ID

  • 9729044

Pubmed Central ID

  • 9729044

International Standard Serial Number (ISSN)

  • 1074-7613

Language

  • eng

Conference Location

  • United States