title: G-proteins in etiolated Avena seedlings. Possible phytochrome regulation.
abstract: The molecular mechanism of light signal transduction in plants mediated by the photosensor phytochrome is not well understood. The possibility that phytochrome initiates the signal transduction chain by modulating a G-protein-like receptor is examined in the present work. Etiolated Avena seedlings contain G-proteins as examined in terms of the binding of GTP as well as by cross-reaction with mammalian G-protein antibodies. The binding of GTP was regulated in vivo by red/far-red light. The possible involvement of G-proteins in the phytochrome-mediated signal transduction in etiolated Avena seedlings has been implicated from the study of the light regulated expression of the Cab and phy genes.
authors.affiliation: Institute for Cellular and Molecular Photobiology, University of Nebraska-Lincoln 68588-0304.
authors.forename: L C
authors.initials: LC
authors.lastname: Romero
authors.forename: D
authors.initials: D
authors.lastname: Sommer
authors.forename: C
authors.initials: C
authors.lastname: Gotor
authors.forename: P S
authors.initials: PS
authors.lastname: Song
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000378:metabolism; D015152:Blotting, Northern; D002772:Cholera Toxin / Q000494:pharmacology; D019204:GTP-Binding Proteins / Q000276:immunology / Q000502:physiology*; D005786:Gene Expression Regulation / Q000187:drug effects; D017343:Genes, Plant; D006160:Guanosine Triphosphate / Q000378:metabolism; D008027:Light; D010834:Phytochrome / Q000235:genetics*; D006109:Poaceae / Q000502:physiology*; D012333:RNA, Messenger / Q000235:genetics; D015398:Signal Transduction
chemical_list: D012333:RNA, Messenger; D010834:Phytochrome; D000246:Adenosine Diphosphate Ribose; D006160:Guanosine Triphosphate; D002772:Cholera Toxin; D019204:GTP-Binding Proteins