Abstract：
:Two membrane bound guanylate cyclases are expressed in vertebrate photoreceptor cells. They serve a key function in photoreceptor physiology as they synthesize the intracellular transmitter of photoexcitation guanosine 3',5'-cyclic monophosphate (cGMP). Both cyclases named ROS-GC1 and ROS-GC2 form a subclass of membrane bound cyclases and differ in many aspects from hormone peptide receptor guanylate cyclases. One unique feature is their regulation by three small Ca2+-binding proteins called GCAPs. These regulatory proteins sense changes in the cytoplasmic Ca2+-concentration [Ca2+] during illumination and activate ROS-GCs when the [Ca2+] decreases below the value in a dark adapted cell of 500-600 nM. Recent work has identified the target regions of GCAP-1 in ROS-GC1. In addition to GCAPs several other proteins including aktin, tubulin, a glutamic-acid-rich protein and a GTPase accelerating protein (RGS9) were found to interact with ROS-GC1 and probably form a multiprotein complex.
journal_name
Mol Cell Biochemjournal_title
Molecular and cellular biochemistryauthors
Koch KW,Duda T,Sharma RKkeywords:
subject
Has Abstractpub_date
2002-01-01 00:00:00pages
97-106issue
1-2eissn
0300-8177issn
1573-4919journal_volume
230pub_type
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