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- Title
Characterization of guanylate cyclase in squid photoreceptors.
- Authors
Robinson, Phyllis R.; Cote, Richard H.
- Abstract
Light causes a rapid, 1.7-fold increase in cyclic GMP concentration in intact squid retinas (Johnson et al. (1986)). To determine whether light-induced changes in cyclic GMP concentration result from activation of guanylate cyclase, we have studied the regulation of guanylate cyclase activity in squid (Loligo pealei) photoreceptors. The enzyme is membrane-associated and activity is enhanced by the detergents Triton X-100 or digitonin. The enzyme requires divalent cations, Mn2+ being preferred over Mg2+. The dependence of enzyme activity on the MnGTP concentration deviates from simple Michaelis-Menten kinetics. Under conditions where a light-induced binding of GTP to the guanine nucleotide regulatory protein can be observed, no light-induced change in guanylate cyclase could be detected.
- Publication
Visual Neuroscience, 1989, Vol 3, Issue 1, p1
- ISSN
0952-5238
- Publication type
Article
- DOI
10.1017/S0952523800012451