Independent evolution of the prochlorophyte and green plant chlorophyll a/b light-harvesting proteins.
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.
La Roche
J
J
Brookhaven National Laboratory, Upton, NY 11973, USA.
van der Staay
G W
GW
Partensky
F
F
Ducret
A
A
Aebersold
R
R
Li
R
R
Golden
S S
SS
Hiller
R G
RG
Wrench
P M
PM
Larkum
A W
AW
Green
B R
BR
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
D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D045332:Photosystem II Protein Complex