title: Volvoxrhodopsin, a light-regulated sensory photoreceptor of the spheroidal green alga Volvox carteri.
abstract: Somatic cells of the multicellular alga Volvox carteri contain a visual rhodopsin that controls the organism's phototactic behavior via two independent photoreceptor currents. Here, we report the identification of an opsinlike gene, designated as volvoxopsin (vop). The encoded protein exhibits homologies to the opsin of the unicellular alga Chlamydomonas reinhardtii (chlamyopsin) and to the entire animal opsin family, thus providing new perspectives on opsin evolution. Volvoxopsin accumulates within the eyes of somatic cells. However, the vop transcript is detectable only in the reproductive eyeless gonidia and embryos. vop mRNA levels increase 400-fold during embryogenesis, when embryos develop in darkness, whereas the vop transcript does not accumulate when embryos develop in the light. An antisense transformant, T3, was generated. This transformant produces 10 times less volvoxopsin than does the wild type. In T3, the vop transcript is virtually absent, whereas the antisense transcript is predominant and light regulated. It follows that vop expression is under light-dependent transcriptional control but that volvoxopsin itself is not the regulatory photoreceptor. Transformant T3 is phototactic, but its phototactic sensitivity is reduced 10-fold relative to the parental wild-type strain HK10. Thus, we offer definitive genetic evidence that a rhodopsin serves as the photoreceptor for phototaxis in a green alga.
authors.affiliation: Institut für Biochemie I, Universität Regensburg, 93040 Regensburg, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Ebnet
authors.forename: M
authors.initials: M
authors.lastname: Fischer
authors.forename: W
authors.initials: W
authors.lastname: Deininger
authors.forename: P
authors.initials: P
authors.lastname: Hegemann
mesh_terms: D020418:Algal Proteins; D000595:Amino Acid Sequence; D016375:Antisense Elements (Genetics); D001483:Base Sequence; D000460:Chlorophyta / Q000235:genetics* / Q000528:radiation effects*; D018076:DNA, Complementary / Q000235:genetics; D019143:Evolution, Molecular; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D008565:Membrane Proteins / Q000378:metabolism*; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000302:isolation & purification; D011994:Recombinant Proteins / Q000096:biosynthesis; D017299:Rod Opsins / Q000145:classification / Q000235:genetics; D012568:Schizosaccharomyces / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D014170:Transformation, Genetic
chemical_list: D020418:Algal Proteins; D016375:Antisense Elements (Genetics); D018076:DNA, Complementary; D008565:Membrane Proteins; D012333:RNA, Messenger; D011994:Recombinant Proteins; D017299:Rod Opsins