NDLI: Role of guanylate cyclase-activating proteins (GCAPs) in setting the flash sensitivity of rod photoreceptors

Content Provider	PubMed Central
Author	Mendez, Ana Burns, Marie E. Sokal, Izabela Dizhoor, Alexander M. Baehr, Wolfgang Palczewski, Krzysztof Baylor, Denis A. Chen, Jeannie
Copyright Year	2001
Abstract	The retina's photoreceptor cells adjust their sensitivity to allow photons to be transduced over a wide range of light intensities. One mechanism thought to participate in sensitivity adjustments is Ca2+ regulation of guanylate cyclase (GC) by guanylate cyclase-activating proteins (GCAPs). We evaluated the contribution of GCAPs to sensitivity regulation in rods by disrupting their expression in transgenic mice. The GC activity from GCAPs−/− retinas showed no Ca2+ dependence, indicating that Ca2+ regulation of GCs had indeed been abolished. Flash responses from dark-adapted GCAPs−/− rods were larger and slower than responses from wild-type rods. In addition, the incremental flash sensitivity of GCAPs−/− rods failed to be maintained at wild-type levels in bright steady light. GCAP2 expressed in GCAPs−/− rods restored maximal light-induced GC activity but did not restore normal flash response kinetics. We conclude that GCAPs strongly regulate GC activity in mouse rods, decreasing the flash sensitivity in darkness and increasing the incremental flash sensitivity in bright steady light, thereby extending the rod's operating range.
Related Links	http://dx.doi.org/10.1073/pnas.171308998
Ending Page	9953
Page Count	6
Starting Page	9948
File Format	PDF
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	17
Volume Number	98
Language	English
Publisher	National Academy of Sciences
Publisher Date	2001-08-14
Access Restriction	Open
Rights Holder	National Academy of Sciences
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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