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- W2066261311 abstract "Following up the results from previous studies on chemical fragmentation of TPA-treated, [32P]phosphate labeled adenylyl cyclase type II (AC II) (Böl, G. F., Hülster, A., and Pfeuffer, T. in press) we have replaced serine 871 or threonine 1057 by alanine using site directed mutagenesis. Both mutants had unimpaired catalytic activity, however enhancement by phorbolester TPA was reduced by 60–80 % in the T1057A mutant, but not in the S871A mutant. The stimulation of adenylyl cyclase type II by βγ subunits of heterotrimeric G-pro teins and that by PKC have been previously shown to be mutually exclusive (Zimmermann and Taussig (1996), J. Biol. Chem.271,27161-27166). This is in line with the present findings that AC II expressed in COS-1 cells was only barely stimulated (10%) by coexpressed βγ-subunits in presence of TPA. Mutation of threonine 1057 to alanine however caused partial regain of βγ-stimulation in the presence of TPA by 40%, as compared to that of WT adenylyl cyclase type II which was 70% in the absence of TPA. These data strongly implicate the importance of threonine 1057 as phosphate acceptor following PKC-mediated sensitisation of adenylyl cyclase type II." @default.
- W2066261311 created "2016-06-24" @default.
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- W2066261311 date "1997-08-01" @default.
- W2066261311 modified "2023-10-14" @default.
- W2066261311 title "Phorbol Ester-Induced Sensitisation of Adenylyl Cyclase Type II Is Related to Phosphorylation of Threonine 1057" @default.
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- W2066261311 doi "https://doi.org/10.1006/bbrc.1997.7123" @default.
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