title: Independent evolution of the prochlorophyte and green plant chlorophyll a/b light-harvesting proteins.
abstract: The prochlorophytes are oxygenic prokaryotes differing from other cyanobacteria by the presence of a light-harvesting system containing both chlorophylls (Chls) a and b and by the absence of phycobilins. We demonstrate here that the Chl a/b binding proteins from all three known prochlorophyte genera are closely related to IsiA, a cyanobacterial Chl a-binding protein induced by iron starvation, and to CP43, a constitutively expressed Chl a antenna protein of photosystem II. The prochlorophyte Chl a/b protein (pcb) genes do not belong to the extended gene family encoding eukaryotic Chl a/b and Chl a/c light-harvesting proteins. Although higher plants and prochlorophytes share common pigment complements, their light-harvesting systems have evolved independently.
authors.affiliation: Brookhaven National Laboratory, Upton, NY 11973, USA.
authors.forename: J
authors.initials: J
authors.lastname: La Roche
authors.forename: G W
authors.initials: GW
authors.lastname: van der Staay
authors.forename: F
authors.initials: F
authors.lastname: Partensky
authors.forename: A
authors.initials: A
authors.lastname: Ducret
authors.forename: R
authors.initials: R
authors.lastname: Aebersold
authors.forename: R
authors.initials: R
authors.lastname: Li
authors.forename: S S
authors.initials: SS
authors.lastname: Golden
authors.forename: R G
authors.initials: RG
authors.lastname: Hiller
authors.forename: P M
authors.initials: PM
authors.lastname: Wrench
authors.forename: A W
authors.initials: AW
authors.lastname: Larkum
authors.forename: B R
authors.initials: BR
authors.lastname: Green
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D000458:Cyanobacteria / Q000737:chemistry / Q000235:genetics*; D017343:Genes, Plant; D045342:Light-Harvesting Protein Complexes; D008969:Molecular Sequence Data; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry* / Q000235:genetics*; D045332:Photosystem II Protein Complex; D010802:Phylogeny; D010944:Plants / Q000235:genetics*; D017386:Sequence Homology, Amino Acid
chemical_list: D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex