Phototropins 1 and 2: versatile plant blue-light receptors.
Blue and ultraviolet-A light regulate a wide range of responses in plants, including phototropism, chloroplast migration and stomatal opening. However, the photoreceptors for these light responses have been identified only recently. The phototropins (phot1 and phot2) represent a new class of receptor kinases that appear to be exclusive to plants. Recent genetic analysis has shown that phot1 and phot2 exhibit partially overlapping functions in mediating phototropism, chloroplast migration, and stomatal opening in Arabidopsis. Although significant progress has been made in understanding the early photochemical and biochemical events that follow phototropin excitation, the details of how this excitation activates such different responses remain to be elucidated.
Briggs
Winslow R
WR
Dept Plant Biology, Carnegie Institution of Washington, Stanford, CA 94305, USA. briggs@andrew2.stanford.edu
Christie
John M
JM
D017360:Arabidopsis / Q000235:genetics / Q000502:physiology / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology; D002736:Chloroplasts / Q000502:physiology; D056931:Cryptochromes; D029721:Drosophila Proteins; D005136:Eye Proteins; D005420:Flavoproteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D008027:Light; D009154:Mutation; D010100:Oxygen / Q000502:physiology; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology; D017956:Photoreceptor Cells, Invertebrate; D018524:Phototropism / Q000502:physiology / Q000528:radiation effects; D010944:Plants / Q000235:genetics / Q000378:metabolism / Q000528:radiation effects*; D017346:Protein Serine-Threonine Kinases; D043562:Receptors, G-Protein-Coupled; D013053:Spectrophotometry; D014466:Ultraviolet Rays
D029681:Arabidopsis Proteins; C538962:CRY1 protein, Arabidopsis; D056931:Cryptochromes; D029721:Drosophila Proteins; D005136:Eye Proteins; D005420:Flavoproteins; C423903:PHOT2 protein, Arabidopsis; D010750:Phosphoproteins; D043562:Receptors, G-Protein-Coupled; C119828:cry protein, Drosophila; C103646:NPH1 protein, Arabidopsis; D017346:Protein Serine-Threonine Kinases; D010100:Oxygen