Rhodomicrobium vannielii

Heising S. and Schink B. (1998) Phototrophic oxidation of ferrous iron by a Rhodomicrobium vannielii strain. Microbiology 144, 2263 -2269. 

New Structures.—Monocyclic Carotenoids. A poly-cw-isomer of y-carotene carotene (1)], isolated from Tangerine tomato fruits, may be similar to pro-y-carotene from Pyracantha angustifolia. Two compounds from the Delta tomato mutant have been identified as l, 2 -epoxy-r,2 -dihydro-j8, /f-carotene (2) and l, 2 -epoxy-l, 2 -dihydro-e,j/ -carotene (3), epoxides of y- and 5-carotene respectively. Evidence has been presented for the structure (4) (r-methoxy-3, 4 -didehydro-l, 2 -dihydro-jS, / -carotene) for a minor carotenoid of Rhodomicrobium vannielii. On the basis of its light absorption spectrum and chemical reactions, a minor compound from the yeast Phaffia rhodozyma has been assigned structure (5), 3-hydroxy-3, 4 -didehydro-j8, / -caroten-4-one. ... 

In the photosynthetic bacteria Rhodomicrobium vannielii, which normally contains acyclic carotenoids with tertiary hydroxy- and methoxy-groups at C-1 and C-T, phytoene only accumulated when diphenylamine was present, but the occurrence of hydroxy-derivatives of phytofluene, 7,8,11,12-tetrahydrolycopene, neurosporene, and lycopene in the presence of the inhibitor indicated that hydroxylation could take place at any level of desaturation although only the more desaturated half of the molecule was so substituted. 

Inhibitor studies with the photosynthetic bacterium Rhodomicrobium vannielii showed that both nicotine and CPTA [2-(4-chlorophenylthio)triethylammonium chloride] block the formation of both /3-carotene and the major acyclic carotenoids such as rhodopin [l,2-dihydro- /r,i/f-caroten-l-ol (184)] and spirillo-xanthin [l,T-dimethoxy-3,4,3, 4 -tetradehydro-1,2,1, 2 -tetrahydro-i/, t/r-caro-... 

Britton G, Singh RK, Goodwin TW and Ben-Aziz A (1975) The carotenoids of Rhodomicrobium vannielii (Rhodospirillaceae) and the effect of diphenylamine on the carotenoid composition. Phytochemistry 14 2427-2433... 

Branched alkenes from bacteria The highly unsaturated isoprenoid squalene is the major constituent of the branched and cyclic fraction in the photosynthetic bacteria Rhodospirillum rubrum and Rhodomicrobium vannielii (Han and Calvin, 1969). 

Fig. 1. Reversed phase HPLC chromatograms of pigment extracts of A. Rhodocyclus qelatinosus 151 B. Rhodomicrobium vannielii RB4...

Rhodospirillum rubrum Rhodomicrobium vannielii Thiobacillus A2 Thiobacillus ferrooxidans Thiobacillus thiooxidans... 

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