On the origin of photosynthesis as inferred from sequence analysis - A primordial UV-protector as common ancestor of reaction centers and antenna proteins

Autor(en): Mulkidjanian, AY
Junge, W 
Stichwörter: BACTERIAL REACTION CENTERS; bacteriorhodopsin; CHLOROFLEXUS-AURANTIACUS; CYANOBACTERIUM SYNECHOCYSTIS-6803; evolution; Heliobacillus mobilis; II REACTION-CENTER; LIGHT-HARVESTING COMPLEX; NUCLEOTIDE-SEQUENCE; photosynthetic reaction center; Photosystem I; Photosystem II; PHOTOSYSTEM-II; Plant Sciences; RHODOBACTER-SPHAEROIDES R-26; Rhodopseudomonas viridis; RHODOPSEUDOMONAS-VIRIDIS; SECONDARY STRUCTURE; UV-protection
Erscheinungsdatum: 1997
Herausgeber: KLUWER ACADEMIC PUBL
Journal: PHOTOSYNTHESIS RESEARCH
Volumen: 51
Ausgabe: 1
Startseite: 27
Seitenende: 42
Zusammenfassung: 
Sequence alignments between membrane-spanning segments of pheophytin-quinone-type photosynthetic reaction centers, FeS-type photosynthetic reaction centers, core chlorophyll-proteins of PS II, chlorophyll a/b-containing antenna proteins of plants and light-harvesting complexes of purple bacteria led us to postulate a large common ancestral pigment-carrying protein with more than 10 membrane spans. Its original function as a UV-protector of the primordial cell is discussed. It is conceivable that a purely dissipative photochemistry started still in the context of the UV-protection. We suggest that mutations causing the loss of certain porphyrin-type pigments led to the acquisition of redox cofactors and paved the way for a gradual transition from dissipative to productive photochemistry.
ISSN: 01668595
DOI: 10.1023/A:1005726809084

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