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Biochem Biophys Res Commun. 1994 Aug 30;203(1):121-7.

Inhibition of rhodopsin phosphorylation by non-myristoylated recombinant recoverin.

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1
Department of Physiology, Keio University School of Medicine, Tokyo, Japan.

Abstract

Bovine recoverin regulates rhodopsin phosphorylation and controls photoreceptor light sensitivity in a Ca(2+)-dependent manner. Recoverin is post-translationally modified with lipids (myristic acid or related lipids) at its N-terminus. Since with this lipid modification (N-myristoylation), recoverin associates with rod outer segment membranes in a Ca(2+)-dependent manner, N-myristoylation has been suggested to be important for the function of this protein. To study the role of this modification, we obtained recombinant non-myristoylated recoverin in E. coli and studied its functional properties. Here, we report that recombinant non-myristoylated recoverin inhibits rhodopsin phosphorylation at Ca2+ concentrations of 30 nM-10 microM in a similar way as native N-myristoylated recoverin does. Thus, our result showed that N-myristoylation is not essential for the Ca(2+)-dependent inhibition of rhodopsin phosphorylation by recoverin.

PMID:
8074645
DOI:
10.1006/bbrc.1994.2157
[Indexed for MEDLINE]
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