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• W2106772044 endingPage "6184" @default.
• W2106772044 startingPage "6176" @default.
• W2106772044 abstract "Bacteriochlorophyll (BChl) c is the major photosynthetic pigment in the green sulfur bacterium Chlorobaculum tepidum, in which it forms protein-independent aggregates that function in light harvesting. BChls c, d, and e are found only in chlorosome-producing bacteria and are unique among chlorophylls because of methylations that occur at the C-8(2) and C-12(1) carbons. Two genes required for these methylation reactions were identified and designated bchQ (CT1777) and bchR (CT1320). BchQ and BchR are members of the radical S-adenosylmethionine (SAM) protein superfamily; each has sequence motifs to ligate a [4Fe-4S] cluster, and we propose that they catalyze the methyl group transfers. bchQ, bchR, and bchQ bchR mutants of C. tepidum were constructed and characterized. The bchQ mutant produced BChl c that was not methylated at C-8(2), the bchR mutant produced BChl c that was not methylated at C-12(1), and the double mutant produced [8-ethyl, 12-methyl]-BChl c that lacked methylation at both the C-8(2) and C-12(1) positions. Compared to the wild type, the Qy absorption bands for BChl c in the mutant cells were narrower and blue shifted to various extents. All three mutants grew slower and had a lower cellular BChl c content than the wild type, an effect that was especially pronounced at low light intensities. These observations show that the C-8(2) and C-12(1) methylations of BChl c play important roles in the adaptation of C. tepidum to low light intensity. The data additionally suggest that these methylations also directly or indirectly affect the regulation of the BChl c biosynthetic pathway." @default.
• W2106772044 created "2016-06-24" @default.
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• W2106772044 date "2007-09-01" @default.
• W2106772044 modified "2023-09-23" @default.
• W2106772044 title "Bacteriochlorophyllide <i>c</i> C-8 ² and C-12 ¹ Methyltransferases Are Essential for Adaptation to Low Light in <i>Chlorobaculum tepidum</i>" @default.
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• W2106772044 doi "https://doi.org/10.1128/jb.00519-07" @default.
• W2106772044 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1951906" @default.
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