[The hormone-sensitive adenylyl cyclase system of the ciliate Dileptus anser].
The hormone-sensitive adenylyl cyclase system (AC system) was found and characterized for unicellular eukaryotes--the ciliatae Dileptus anser. It has been first shown that hormones of higher eukaryotes--biogenic amines (adrenalin, isoproterenol and serotonin) and peptide glucagon--stimulate in dose-dependent manner the activity of adenylyl cyclase (AC) of D. anser. The enzymatic activity was stimulated also by guanine nucleotides--GTP and their non-hydrolysable analogue Gpp[NH]p. Stimulating effects of hormones and guanine nucleotides strongly depend on the level of AC basal activity, which is relatively easy to reach (1430 to 3900 pmol cAMP/min per 1 mg of protein). The sensitivity of D. anser AC system to hormones and guanine nucleotides shows the presence of receptor or receptor-related molecules, capable of interacting with the hormone and activating AC through heterotrimeric G-proteins, in ciliatae. On the base of obtained data, a conclusion is made about the similarity of the structural-functional organization of AC systems of D. anser and higher eukaryotes.
Derkach
K V
KV
Institute of Evolutionary Physiology and Biochemistry RAS, St. Petersburg.
Shpakov
A O
AO
Kuznetsova
L A
LA
Plesneva
S A
SA
Uspenskaia
Z I
ZI
Pertseva
M N
MN
D000262:Adenylyl Cyclases / Q000737:chemistry / Q000378:metabolism*; D000818:Animals; D016798:Ciliophora / Q000187:drug effects / Q000201:enzymology*; D004789:Enzyme Activation / Q000187:drug effects; D004837:Epinephrine / Q000494:pharmacology; D005934:Glucagon / Q000494:pharmacology; D006160:Guanosine Triphosphate / Q000494:pharmacology; D006165:Guanylyl Imidodiphosphate / Q000494:pharmacology; D007545:Isoproterenol / Q000494:pharmacology; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012701:Serotonin / Q000494:pharmacology; D013329:Structure-Activity Relationship
D011500:Protein Synthesis Inhibitors; D012701:Serotonin; D006165:Guanylyl Imidodiphosphate; D006160:Guanosine Triphosphate; D005934:Glucagon; D000262:Adenylyl Cyclases; D007545:Isoproterenol; D004837:Epinephrine