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Titolo:
Phosphorylation-independent association of CXCR2 with the protein phosphatase 2A core enzyme
Autore:
Fan, GH; Yang, W; Sai, JQ; Richmond, A;
Indirizzi:
Vanderbilt Univ, Sch Med, Dept Canc Biol, Nashville, TN 37232 USA Vanderbilt Univ Nashville TN USA 37232 Canc Biol, Nashville, TN 37232 USA Dept Vet Affairs, Nashville, TN 37212 USA Dept Vet Affairs Nashville TN USA 37212 Affairs, Nashville, TN 37212 USA
Titolo Testata:
JOURNAL OF BIOLOGICAL CHEMISTRY
fascicolo: 20, volume: 276, anno: 2001,
pagine: 16960 - 16968
SICI:
0021-9258(20010518)276:20<16960:PAOCWT>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
OKADAIC ACID; RECEPTOR INTERNALIZATION; CHEMOKINE RECEPTORS; SIGNAL-TRANSDUCTION; CALYCULIN-A; SUBCELLULAR-DISTRIBUTION; CROSS-REGULATION; IL-8 RECEPTOR; DESENSITIZATION; DEPHOSPHORYLATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Richmond, A Vanderbilt Univ, Sch Med, Dept Canc Biol, 221 Kirkland Hall, Nashville, TN37232 USA Vanderbilt Univ 221 Kirkland Hall Nashville TN USA 37232 2 USA
Citazione:
G.H. Fan et al., "Phosphorylation-independent association of CXCR2 with the protein phosphatase 2A core enzyme", J BIOL CHEM, 276(20), 2001, pp. 16960-16968

Abstract

Protein phosphatase 2A (PP2A) is postulated to be involved in the dephosphorylation of G protein-coupled receptors, In the present study, we demonstrate that the carboxyl terminus of CXCR2, physically interacts with the PP2Acore enzyme, a dimer formed by PP2Ac and PR65, but not with the PP2Ac monomer, suggesting direct interaction of the receptor with PR65, The integrityof a sequence motif in the C terminus of CXCR2, KFRHGL, which is conservedin all CC and CXC chemokine receptors, is required for the receptor binding to the PP2A core enzyme. CXCR2 co-immunoprecipitates with the PP2A core enzyme in HEK293 cells and in human neutrophils, Overexpression of dominant negative dynamin 1 (dynamin 1 K44A) in CXCR2-expressing cells blocks the receptor association with the PP2A core enzyme, and an internalization-deficient mutant form of CXCR2 (I323A,L324A) also exhibits impaired association with the PP2A core enzyme, suggesting that the receptor internalization is required for the receptor binding to PP2A. A phosphorylation-deficient mutant of CXCR2 (331T), which has previously been shown to undergo internalization in HEK293 cells, binds to an almost equal amount of the PP2A core enzymein comparison with the wild-type CXCR2, suggesting that the interaction ofthe receptor with PP2A is phosphorylation-independent. The dephosphorylation of CXCR2 is reversed by treatment of the cells with okadaic acid. Moreover, pretreatment of the cells with okadaic acid increases basal phosphorylation of CXCR2 and attenuates CXCR2-mediated calcium mobilization and chemotaxis, Taken together, these data indicate that PP2A is involved in the dephosphorylation of CXCR2, We postulate that this interaction results from direct binding of the regulatory subunit A (PR65) of PP2A to the carboxyl terminus of CXCR2 after receptor sequestration and internalization.

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Documento generato il 05/04/20 alle ore 02:45:14