title: The spectral tuning in the short wavelength-sensitive type 2 pigments.
abstract: Using site-directed mutagenesis and multiple regression analysis, we have studied the molecular genetics and evolution of short wavelength-sensitive (SWS2) pigments in vertebrates. These analyses suggest that the SWS2 pigment in the vertebrate ancestor had the wavelength of maximum absorption (lambda(max)) of approximately 440 nm and that various lambda(max)'s of the contemporary SWS2 pigments in vertebrates are caused mainly by additive effects of amino acid replacements at ten sites.
authors.affiliation: Department of Biology, Biological Research Laboratories, Syracuse University, 130 College Place, Syracuse, NY 13244, USA. syokoyam@mailbox.syr.edu
authors.forename: Shozo
authors.initials: S
authors.lastname: Yokoyama
authors.forename: Takashi
authors.initials: T
authors.lastname: Tada
mesh_terms: D000818:Animals; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D010802:Phylogeny; D012168:Retinal Pigments / Q000737:chemistry* / Q000235:genetics*; D013053:Spectrophotometry; D014714:Vertebrates
chemical_list: D012168:Retinal Pigments