Abstract
The cDNAs for two membrane guanylyl cyclases, designated E (GC-E) and F (GC-F, were isolated from a rat eye cDNA library. Their deduced topographic structures correspond to known members of the guanylyl cyclase receptor family, containing an extracellular domain, a single membrane-spanning domain, a protein kinase-like domain, and a cyclase catalytic domain. GC-E was expressed in the eye and the pineal gland, whereas GC-F expression was confined to the eye. Overproduction of GC-E and GC-F in COS cells resulted in expression of guanylyl cyclase activity, but ligands known to activate other guanylyl cyclase receptors failed to stimulate enzyme activity. Thus, both GC-E and GC-F remain orphan receptors. Amino acid sequence similarity between GC-E and GC-F in the extracellular region and homology with a cyclase expressed in olfactory neurons and retGC, a rod outer-segment-specific cyclase, suggest that there is another subfamily of guanylyl cyclase receptors, possibly restricted to sensory tissues.
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