Abstract
The effects of exogenous vitamin B12 on the green sulfur photosynthetic bacterium Chlorobium (Chl.) tepidum were examined. Wild-type cells and mutant cells lacking a gene CT0388 (denoted as VB0388) of Chl.tepidum were grown in liquid cultures containing different concentrations of vitamin B12. The VB0388 cells hardly grew in vitamin B12-limited media, indicating that the product of CT0388 actually played an important role in vitamin B12 biosynthesis in Chl. tepidum. Both wild-type and VB0388 cells in vitamin B12-limited media exhibited absorption bands and CD signals at the Qy region that were shifted to a shorter wavelength than those of cells grown in normal media. BChl c isomers that had S-stereochemistry at the 31-position tended to increase in Chl. tepidum grown in vitamin B12-limited media.
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This paper was published as part of the themed issue of contributions from the 7th International Conference on Tetrapyrrole Photoreceptors in Photosynthetic Organisms held in Kyoto, December 2007.
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Saga, Y., Harada, J., Hattori, H. et al. Spectroscopic properties and bacteriochlorophyll c isomer composition of extramembranous light-harvesting complexes in the green sulfur photosynthetic bacterium Chlorobium tepidum and its CT0388-deleted mutant under vitamin B12-limited conditions. Photochem Photobiol Sci 7, 1210–1215 (2008). https://doi.org/10.1039/b802354a
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DOI: https://doi.org/10.1039/b802354a