Light-harvesting II (B800-B850 complex) structural genes from Rhodopseudomonas capsulata
AUTOR(ES)
Youvan, Douglas C.
RESUMO
The light-harvesting II (LHII) structural genes coding for the (B800-B850 complex) β- and α-polypeptides have been cloned and the nucleotide and deduced polypeptide sequences have been determined. This completes the sequencing of all seven structural genes coding for the structural polypeptides of the photosynthetic apparatus that bind the pigments and cofactors participating in the primary light reactions of photosynthesis. Unlike the structural genes coding for the reaction center L, M, and H subunits and the light-harvesting I (LHI) (B870 complex) structural polypeptides, the LHII structural genes are not within the 46-kilobase photosynthetic gene cluster carried by the R-prime plasmid pRPS404. Identical organization of the β and α structural genes for both LHI and LHII and sequence homologies between the two β-polypeptides and between the two α-polypeptides suggests that both complexes arose by gene duplication from a single ancestral light-harvesting complex and that the putative bacteriochlorophyll binding sequence Ala-X-X-X-His has been absolutely conserved.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=396970Documentos Relacionados
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