Differential modulation of adenylyl cyclases I and II by various G beta subunits.
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.
Bayewitch
M L
ML
Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel.
Avidor-Reiss
T
T
Levy
R
R
Pfeuffer
T
T
Nevo
I
I
Simonds
W F
WF
Vogel
Z
Z
D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D019556:COS Cells; D019204:GTP-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding; D011487:Protein Conformation; D014162:Transfection
D019204:GTP-Binding Proteins; D000262:Adenylyl Cyclases; C106670:adenylyl cyclase 1; C100622:adenylyl cyclase 2