Rapid and reproducible deactivation of rhodopsin requires multiple phosphorylation sites

Ana Mendez, Marie E Burns, Angela Roca, Janis Lem, Lan Wing Wu, Melvin I. Simon, Denis A. Baylor, Jeannie Chen

Research output: Contribution to journalArticlepeer-review

207 Scopus citations


Efficient single-photon detection by retinal rod photoreceptors requires timely and reproducible deactivation of rhodopsin. Like other G protein-coupled receptors, rhodopsin contains multiple sites for phosphorylation at its COOH-terminal domain. Transgenic and electrophysiological methods were used to functionally dissect the role of the multiple phosphorylation sites during deactivation of rhodopsin in intact mouse rods. Mutant rhodopsins bearing zero, one (S338), or two (S334/S338) phosphorylation sites generated single-photon responses with greatly prolonged, exponentially distributed durations. Responses from rods expressing mutant rhodopsins bearing more than two phosphorylation sites declined along smooth, reproducible time courses; the rate of recovery increased with increasing numbers of phosphorylation sites. We conclude that multiple phosphorylation of rhodopsin is necessary for rapid and reproducible deactivation.

Original languageEnglish (US)
Pages (from-to)153-164
Number of pages12
Issue number1
StatePublished - 2000
Externally publishedYes

ASJC Scopus subject areas

  • Neuroscience(all)


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