Abstract
The endothelial nitric-oxide synthase (eNOS) is regulated in part by serine/threonine phosphorylation, but eNOS tyrosine phosphorylation is less well understood. In the present study we have examined the tyrosine phosphorylation of eNOS in bovine aortic endothelial cells (BAECs) exposed to oxidant stress. Hydrogen peroxide and pervanadate (PV) treatment stimulates eNOS tyrosine phosphorylation in BAECs. Phosphorylation is blocked by the Src kinase family inhibitor, 4-amino-5-(4-chlorophenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine (PP2). Moreover, eNOS and c-Src can be coimmunoprecipitated from BAEC lysates by antibodies directed against either protein. Domain mapping and site-directed mutagenesis studies in COS-7 cells transfected with either eNOS alone and then treated with PV or cotransfected with eNOS and constitutively active v-Src identified Tyr-83 (bovine sequence) as the major eNOS tyrosine phosphorylation site. Tyr-83 phosphorylation is associated with a 3-fold increase in basal NO release from cotransfected cells. Furthermore, the Y83F eNOS mutation attenuated thapsigargin-stimulated NO production. Taken together, these data indicate that Src-mediated tyrosine phosphorylation of eNOS at Tyr-83 modulates eNOS activity in endothelial cells.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 35943-35952 |
| Number of pages | 10 |
| Journal | Journal of Biological Chemistry |
| Volume | 280 |
| Issue number | 43 |
| DOIs | |
| State | Published - Oct 28 2005 |
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ASJC Scopus subject areas
- Biochemistry
- Molecular Biology
- Cell Biology
Cite this
Src kinase activates endothelial nitric-oxide synthase by phosphorylating Tyr-83. / Fulton, David J; Church, Jarrod E.; Ruan, Ling; Li, Chunying; Sood, Sarika G.; Kemp, Bruce E.; Jennings, Ian G.; Venema, Richard C.
In: Journal of Biological Chemistry, Vol. 280, No. 43, 28.10.2005, p. 35943-35952.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Src kinase activates endothelial nitric-oxide synthase by phosphorylating Tyr-83
AU - Fulton, David J
AU - Church, Jarrod E.
AU - Ruan, Ling
AU - Li, Chunying
AU - Sood, Sarika G.
AU - Kemp, Bruce E.
AU - Jennings, Ian G.
AU - Venema, Richard C
PY - 2005/10/28
Y1 - 2005/10/28
N2 - The endothelial nitric-oxide synthase (eNOS) is regulated in part by serine/threonine phosphorylation, but eNOS tyrosine phosphorylation is less well understood. In the present study we have examined the tyrosine phosphorylation of eNOS in bovine aortic endothelial cells (BAECs) exposed to oxidant stress. Hydrogen peroxide and pervanadate (PV) treatment stimulates eNOS tyrosine phosphorylation in BAECs. Phosphorylation is blocked by the Src kinase family inhibitor, 4-amino-5-(4-chlorophenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine (PP2). Moreover, eNOS and c-Src can be coimmunoprecipitated from BAEC lysates by antibodies directed against either protein. Domain mapping and site-directed mutagenesis studies in COS-7 cells transfected with either eNOS alone and then treated with PV or cotransfected with eNOS and constitutively active v-Src identified Tyr-83 (bovine sequence) as the major eNOS tyrosine phosphorylation site. Tyr-83 phosphorylation is associated with a 3-fold increase in basal NO release from cotransfected cells. Furthermore, the Y83F eNOS mutation attenuated thapsigargin-stimulated NO production. Taken together, these data indicate that Src-mediated tyrosine phosphorylation of eNOS at Tyr-83 modulates eNOS activity in endothelial cells.
AB - The endothelial nitric-oxide synthase (eNOS) is regulated in part by serine/threonine phosphorylation, but eNOS tyrosine phosphorylation is less well understood. In the present study we have examined the tyrosine phosphorylation of eNOS in bovine aortic endothelial cells (BAECs) exposed to oxidant stress. Hydrogen peroxide and pervanadate (PV) treatment stimulates eNOS tyrosine phosphorylation in BAECs. Phosphorylation is blocked by the Src kinase family inhibitor, 4-amino-5-(4-chlorophenyl)-7-(t-butyl)pyrazolo[3,4-d]pyrimidine (PP2). Moreover, eNOS and c-Src can be coimmunoprecipitated from BAEC lysates by antibodies directed against either protein. Domain mapping and site-directed mutagenesis studies in COS-7 cells transfected with either eNOS alone and then treated with PV or cotransfected with eNOS and constitutively active v-Src identified Tyr-83 (bovine sequence) as the major eNOS tyrosine phosphorylation site. Tyr-83 phosphorylation is associated with a 3-fold increase in basal NO release from cotransfected cells. Furthermore, the Y83F eNOS mutation attenuated thapsigargin-stimulated NO production. Taken together, these data indicate that Src-mediated tyrosine phosphorylation of eNOS at Tyr-83 modulates eNOS activity in endothelial cells.
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UR - http://www.scopus.com/inward/citedby.url?scp=27744435806&partnerID=8YFLogxK
U2 - 10.1074/jbc.M504606200
DO - 10.1074/jbc.M504606200
M3 - Article
VL - 280
SP - 35943
EP - 35952
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 43
ER -