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An unexpectedly branched biosynthetic pathway for bacteriochlorophyll b capable of absorbing near-infrared light
The present data indicate that the plasticity of the nitrogenase-like enzyme caused the branched pathways of BChls a and b biosynthesis, ultimately leading to ecologically different niches of B Chl a- and b-based photosynthesis differentiated by more than 150 nm wavelength. Expand
Identification of the bacteriochlorophylls, carotenoids, quinones, lipids, and hopanoids of "Candidatus Chloracidobacterium thermophilum".
Two major xanthophyll carotenoids, echinenone and canthaxanthin, may confer enhanced protection against reactive oxygen species and could represent a specific adaptation to the highly oxic natural environment in which "Ca. Chloracidobacterium thermophilum" occurs. Expand
Phylogenetic Distribution of Unusual Triheme to Tetraheme Cytochrome Subunit in the Reaction Center Complex of Purple Photosynthetic Bacteria
Phylogenetic relationships among Rhodovulum species based on the pufC gene products were basically consistent with those based on 16S rRNA sequences, suggesting that the basic characteristics of the triheme cytochrome subunit have been conserved during the evolutionary process of the Rhodvulum species. Expand
Ultrastructural analysis and identification of envelope proteins of "Candidatus Chloracidobacterium thermophilum" chlorosomes.
Although "Ca. Chloracidobacterium thermophilum" is an aerobe, energy transfer among the BChls in these chlorosomes was very strongly quenched in the presence of oxygen (as measured by quenching of fluorescence emission). Expand
Completion of biosynthetic pathways for bacteriochlorophyll g in Heliobacterium modesticaldum: The C8-ethylidene group formation.
The finding led to plausible biosynthetic pathways for 8(1)-hydroxy-chlorophyll a, a primary electron acceptor from the special pair in heliobacterial reaction centers, and proposed catalytic mechanisms on hydrogenation reaction of the ethylidene synthase-type CORs are discussed. Expand
Absorption linear dichroism measured directly on a single light-harvesting system: the role of disorder in chlorosomes of green photosynthetic bacteria.
Experiments on chlorosome of a triple mutant of Chlorobaculum tepidum show that the mutant chlorosomes have significantly less inner structural disorder and higher symmetry, compatible with a model of well-ordered concentric cylinders. Expand
Comparison of the physical characteristics of chlorosomes from three different phyla of green phototrophic bacteria.
Spectral imaging revealed significant heterogeneity in the fluorescence emission of individual chlorosomes, likely reflecting the variations in BChl c homolog composition and internal arrangements of the stacked BChls within each chlorosome. Expand
Specific Gene bciD for C7-Methyl Oxidation in Bacteriochlorophyll e Biosynthesis of Brown-Colored Green Sulfur Bacteria
The gene named bciD, which encodes the enzyme involved in C7-formylation in bacteriochlorophyll e biosynthesis, was found and investigated by insertional inactivation in the brown-colored greenExpand
Structural variability in wild-type and bchQ bchR mutant chlorosomes of the green sulfur bacterium Chlorobaculum tepidum.
It is proposed that relaxation of the pseudosymmetry observed for the wild type and a related BChl d mutant leads to extended domains of alternating syn and anti stacks in the bchQ bchR chlorosomes. Expand
Isolation and Characterization of Homodimeric Type-I Reaction Center Complex from Candidatus Chloracidobacterium thermophilum, an Aerobic Chlorophototroph*
This is the first description of aerotolerant type-I homodimeric RCs from the only known chlorophototrophic member of the phylum Acidobacteria and the isolated RC was photoactive in the presence of oxygen. Expand