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J Biol Chem, Vol. 274, Issue 36, 25821-25826, September 3, 1999
From the Department of Immunology and § Laboratory of
Molecular Pathogenesis, c-Src kinase was activated when either murine
NIH3T3 fibroblast cells or immunoprecipitated c-Src proteins were
treated with nitric oxide generator,
S-nitroso-N-acetyl penicillamine (SNAP) or
sodium nitroprusside. Nitric oxide (NO) scavenger hemoglobin and
N2O3 scavenger homocysteine abolished the
SNAP-mediated c-Src kinase activation. Phosphoamino acid analysis and
peptide mapping of in vitro labeled phospho-c-Src proteins
revealed that SNAP promoted the autophosphorylation at tyrosine, which
preferentially took place at Tyr-416. Peptide mapping of in
vivo labeled c-Src kinase excluded the involvement of
phospho-Tyr-527 dephosphorylation in the SNAP-mediated activation
mechanism. Correspondingly, protein-tyrosine phosphatase inhibitor
Na3VO4 did not abolish the SNAP-mediated activation of Src kinase, and the constitutively activated v-Src kinase
was also further up-regulated in activity by SNAP. SNAP, however,
failed to up-regulate the kinase activity of Phe-416 mutant v-Src.
2-Mercaptoethanol or dithiothreitol, which should disrupt
N2O3-mediated S-nitrosylation and
subsequent formation of the S-S bond, abolished the up-regulated
catalytic activity, and the activity was regained after re-exposing the
enzyme to SNAP. Exposure of Src kinase to SNAP promoted both
autophosphorylation and S-S bond-mediated aggregation of the kinase
molecules, demonstrating a linkage between the two events. These
results suggest that the NO/N2O3-provoked
S-nitrosylation/S-S bond formation destabilizes the Src
structure for Tyr-416 autophosphorylation-associated activation bypassing the Tyr-527-linked regulation.
Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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