Crossref journal-article
Rockefeller University Press
The Journal of Cell Biology (291)
Abstract

The trafficking of Src family proteins after biosynthesis is poorly defined. Here we studied the role of dual fatty acylation with myristate and palmitate in biosynthetic transport of p59fyn. Metabolic labeling of transfected COS or NIH 3T3 cells with [35S]methionine followed by analysis of cytosolic and total membrane fractions showed that Fyn became membrane bound within 5 min after biosynthesis. Newly synthesized Src, however, accumulated in the membranes between 20– 60 min. Northern blotting detected Fyn mRNA specifically in soluble polyribosomes and soluble Fyn protein was only detected shortly (1–2 min) after radiolabeling. Use of chimeric Fyn and Src constructs showed that rapid membrane targeting was mediated by the myristoylated NH2-terminal sequence of Fyn and that a cysteine at position 3, but not 6, was essential. Examination of Gαo-, Gαs-, or GAP43-Fyn fusion constructs indicated that rapid membrane anchoring is exclusively conferred by the combination of N-myristoylation plus palmitoylation of cysteine-3. Density gradient analysis colocalized newly synthesized Fyn with plasma membranes. Interestingly, a 10–20-min lag phase was observed between plasma membrane binding and the acquisition of non-ionic detergent insolubility. We propose a model in which synthesis and myristoylation of Fyn occurs on soluble ribosomes, followed by rapid palmitoylation and plasma membrane anchoring, and a slower partitioning into detergent-insoluble membrane subdomains. These results serve to define a novel trafficking pathway for Src family proteins that are regulated by dual fatty acylation.

Bibliography

Hof, W. van ’t, & Resh, M. D. (1997). Rapid Plasma Membrane Anchoring of Newly Synthesized p59  fyn: Selective Requirement for NH2-Terminal Myristoylation and Palmitoylation at Cysteine-3. The Journal of Cell Biology, 136(5), 1023–1035.

Authors 2
  1. Wouter van 't Hof (first)
  2. Marilyn D. Resh (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 26, 2002, 12:47 p.m.)
Deposited 2 years, 1 month ago (July 22, 2023, 2:42 a.m.)
Indexed 5 days, 10 hours ago (Aug. 23, 2025, 9:57 p.m.)
Issued 28 years, 5 months ago (March 10, 1997)
Published 28 years, 5 months ago (March 10, 1997)
Published Online 28 years, 5 months ago (March 10, 1997)
Published Print 28 years, 5 months ago (March 10, 1997)
Funders 0

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@article{Hof_1997, title={Rapid Plasma Membrane Anchoring of Newly Synthesized p59  fyn: Selective Requirement for NH2-Terminal Myristoylation and Palmitoylation at Cysteine-3}, volume={136}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.136.5.1023}, DOI={10.1083/jcb.136.5.1023}, number={5}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Hof, Wouter van ’t and Resh, Marilyn D.}, year={1997}, month=mar, pages={1023–1035} }