title: Time-dependent changes in the carotenoid composition and preferential binding of spirilloxanthin to the reaction center and anhydrorhodovibrin to the LH1 antenna complex in Rhodobium marinum.
abstract: Carotenoids were isolated from the cells of Rhodobium marinum, and their structures were determined by mass spectrometry and 1H nuclear magnetic resonance spectroscopy; the carotenoids include lycopene, rhodopin, anhydrorhodovibrin, rhodovibrin and spirilloxanthin. Time-dependent changes in the carotenoid composition in the reaction center (RC) and the light-harvesting complex 1 (LH1) were traced by high-performance liquid chromatography analysis of the extracts. The carotenoid composition changed according to the spirilloxanthin biosynthetic pathway. However, spirilloxanthin having the longest conjugated chain was always preferentially bound to the RC, and anhydrorhodovibrin and other precursors to the LH1.
authors.affiliation: Faculty of Science, Kwansei Gakuin University, Uegahara, Nishinomiya 662-8501, Japan.
authors.forename: P
authors.initials: P
authors.lastname: Qian
authors.forename: K
authors.initials: K
authors.lastname: Saiki
authors.forename: T
authors.initials: T
authors.lastname: Mizoguchi
authors.forename: K
authors.initials: K
authors.lastname: Hara
authors.forename: T
authors.initials: T
authors.lastname: Sashima
authors.forename: R
authors.initials: R
authors.lastname: Fujii
authors.forename: Y
authors.initials: Y
authors.lastname: Koyama
mesh_terms: D020561:Alphaproteobacteria / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D001665:Binding Sites; D002338:Carotenoids / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D045342:Light-Harvesting Protein Complexes; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010777:Photochemistry; D045322:Photosynthetic Reaction Center Complex Proteins / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D011487:Protein Conformation; D024341:Xanthophylls / Q000737:chemistry / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D045342:Light-Harvesting Protein Complexes; D045322:Photosynthetic Reaction Center Complex Proteins; D024341:Xanthophylls; C094744:light-harvesting complex 1, Rhodospirillum; D002338:Carotenoids; C055255:spirilloxanthin