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  • Title: Differential modulation of adenylyl cyclases I and II by various G beta subunits.
    Author: Bayewitch ML, Avidor-Reiss T, Levy R, Pfeuffer T, Nevo I, Simonds WF, Vogel Z.
    Journal: J Biol Chem; 1998 Jan 23; 273(4):2273-6. PubMed ID: 9442071.
    Abstract:
    The accepted dogma concerning the regulation of adenylyl cyclase (AC) activity by G beta gamma dimers states that the various isoforms of AC respond differently to the presence of free G beta gamma. It has been demonstrated that AC I activity is inhibited and AC II activity is stimulated by G beta gamma subunits. This result does not address the possible differences in modulation that may exist among the different G beta gamma heterodimers. Six isoforms of G beta and 12 isoforms of G gamma have been cloned to date. We have established a cell transfection system in which G beta and G gamma cDNAs were cotransfected with either AC isoform I or II and the activity of these isoforms was determined. We found that while AC I activity was inhibited by both G beta 1/gamma 2 and G beta 5/gamma 2 combinations, AC II responded differentially and was stimulated by G beta 1/gamma 2 and inhibited by G beta 5/gamma 2. This finding demonstrates differential modulatory activity by different combinations of G beta gamma on the same AC isoform and demonstrates another level of complexity within the AC signaling system.
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