Quantitative proteomics of Chlorobaculum tepidum: insights into the sulfur metabolism of a phototrophic green sulfur bacterium

被引:14
作者
Falkenby, Lasse G. [2 ]
Szymanska, Monika [2 ]
Holkenbrink, Carina
Habicht, Kirsten S. [3 ]
Andersen, Jens S. [2 ]
Miller, Mette [2 ]
Frigaard, Niels-Ulrik [1 ]
机构
[1] Univ Copenhagen, Sect Marine Biol, Dept Biol, DK-3000 Helsingor, Denmark
[2] Univ So Denmark, Dept Biochem & Mol Biol, Odense, Denmark
[3] Univ So Denmark, Inst Biol, Odense, Denmark
关键词
quantitative proteomics; photosynthetic bacteria; sulfur metabolism; dissimilatory sulfite reductase; SOX enzyme system; sulfite oxidation; CHLOROBIUM-TEPIDUM; MASS-SPECTROMETRY; GENE-CLUSTER; OXIDATION; PROTEINS;
D O I
10.1111/j.1574-6968.2011.02370.x
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Chlorobaculum (Cba.) tepidum is a green sulfur bacterium that oxidizes sulfide, elemental sulfur, and thiosulfate for photosynthetic growth. To gain insight into the sulfur metabolism, the proteome of Cba. tepidum cells sampled under different growth conditions has been quantified using a rapid gel-free, filter-aided sample preparation (FASP) protocol with an in-solution isotopic labeling strategy. Among the 2245 proteins predicted from the Cba. tepidum genome, approximately 970 proteins were detected in unlabeled samples, whereas approximately 630-640 proteins were detected in labeled samples comparing two different growth conditions. Wild-type cells growing on thiosulfate had an increased abundance of periplasmic cytochrome c-555 and proteins of the periplasmic thiosulfate-oxidizing SOX enzyme system when compared with cells growing on sulfide. A dsrM mutant of Cba. tepidum, which lacks the dissimilatory sulfite reductase DsrM protein and therefore is unable to oxidize sulfur globules to sulfite, was also investigated. When compared with wild type, the dsrM cells exhibited an increased abundance of DSR enzymes involved in the initial steps of sulfur globule oxidation (DsrABCL) and a decreased abundance of enzymes putatively involved in sulfite oxidation (Sat-AprAB-QmoABC). The results show that Cba. tepidum regulates the cellular levels of enzymes involved in sulfur metabolism and other electron-transferring processes in response to the availability of reduced sulfur compounds.
引用
收藏
页码:142 / 150
页数:9
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