1990
DOI: 10.1073/pnas.87.1.288
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Identification of a noncatalytic cGMP-binding domain conserved in both the cGMP-stimulated and photoreceptor cyclic nucleotide phosphodiesterases.

Abstract: Partial amino acid sequence has been determined for the cone, a' subunit of the bovine photoreceptor cyclic nucleotide phosphodiesterase (PDE) and deduced from nucleotide sequences of a partial cDNA clone. These sequences identify the at' subunit as the product of a gene that is distinct from those encoding the a or .3 subunits of the membraneassociated rod photoreceptor PDE. Comparisons between the recently determined cGMP-stimulated-PDE sequence and those of the a and a' photoreceptor PDE subunits reveal an … Show more

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Cited by 162 publications
(62 citation statements)
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References 27 publications
(18 reference statements)
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“…Since a truncated form of the p-subunit would be produced in the rd retina, the 88-kDa immunoreactive component described must be the a-subunit. The presence of a 230-residue domain that is conserved in cyclic nucleotide PDEs in the normal a-and p-subunits (18,23) raised the possibility that the two subunits may be independently active enzymes that can be activated by transducin-a/GTP and inhibited by the PDE t-subunit. The presence of the a-subunit and most likely the y-subunit in the rd retina but the absence of PDE activity strongly suggest that the a-and y-subunits alone are unable to effectively regulate cGMP levels in photoreceptors.…”
Section: Methodsmentioning
confidence: 99%
“…Since a truncated form of the p-subunit would be produced in the rd retina, the 88-kDa immunoreactive component described must be the a-subunit. The presence of a 230-residue domain that is conserved in cyclic nucleotide PDEs in the normal a-and p-subunits (18,23) raised the possibility that the two subunits may be independently active enzymes that can be activated by transducin-a/GTP and inhibited by the PDE t-subunit. The presence of the a-subunit and most likely the y-subunit in the rd retina but the absence of PDE activity strongly suggest that the a-and y-subunits alone are unable to effectively regulate cGMP levels in photoreceptors.…”
Section: Methodsmentioning
confidence: 99%
“…In mammals, GAF domains are mostly found in cyclic nucleotide phosphodiesterases (PDEs), which are crucial cellular enzymes controlling cGMP and cAMP second-messenger levels. Five of the 11 mammalian PDE families contain two GAF domains (PDE2, -5, -6, -10, and -11), all in tandem and N-terminal to the catalytic domain (3)(4)(5). So far, two separate functions, namely cyclic nucleotide binding and dimerization, have been described for different PDE GAF domains.…”
Section: G Af Domains (Named For Cyclic Gmp Adenylyl Cyclasementioning
confidence: 99%
“…However, this cGMP regulation of PDE2 depends on a number of factors: the cellular levels of cGMP and cAMP, the affinity of cGMP for the allosteric site on PDE2, the cellular concentration of PDE2, and the catalytic activity of PDE2. Furthermore, reports that recombinant GAF domains can bind cGMP with high affinity, the activation constant for PDE2 is much higher (ϳ0.2-0.5 M) (43,44). Based on all of these variables, it is challenging to intuitively predict the effect of cGMP on PDE2 activity and GluA1 trafficking.…”
Section: Pde2 Inhibition Enhances Surface Glua1mentioning
confidence: 99%