The arrestin superfamily: cone arrestins are a fourth family.
Arrestins constitute a superfamily of regulatory proteins that down-regulate phosphorylated G-protein membrane receptors, including rod and cone photoreceptors and adrenergic receptors. The potential role of arrestin in color visual processes led us to identify a cDNA encoding a cone-like arrestin in Xenopus laevis, the principle amphibian biological model system. Alignment of 18 deduced amino acid sequences of all known arrestins from both invertebrate and vertebrate species reveals five arrestin families. Further analysis identifies 7 variable and 4 conservative arrestin structural motifs that may identify potential functional domains. The adaptive evolutionary relationship of Xenopus cone arrestin to the arrestin gene tree suggests high intrafamily homology and early gene duplication events.
Craft
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Department of Cell and Neurobiology, University of Southern California School of Medicine, Mary D. Allen Laboratories, Doheny Eye Research Institute, San Pablo, Los Angeles 90033, USA.
Whitmore
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D000595:Amino Acid Sequence; D000818:Animals; D000941:Antigens / Q000737:chemistry / Q000235:genetics*; D019393:Arrestin; D001483:Base Sequence; D005075:Biological Evolution; D017124:Conserved Sequence; D018076:DNA, Complementary / Q000032:analysis / Q000737:chemistry; D005136:Eye Proteins / Q000737:chemistry / Q000235:genetics*; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis / Q000737:chemistry; D012160:Retina / Q000737:chemistry; D017949:Retinal Cone Photoreceptor Cells / Q000737:chemistry*; D016415:Sequence Alignment; D014982:Xenopus laevis
D000941:Antigens; D019393:Arrestin; D018076:DNA, Complementary; D005136:Eye Proteins; D012333:RNA, Messenger