Identification and analysis of four candidate symbiosis genes from 'Chlorochromatium aggregatum', a highly developed bacterial symbiosis

Environmental Microbiology
Kajetan VoglJ Overmann

Abstract

The consortium 'Chlorochromatium aggregatum' currently represents the most highly developed interspecific association between prokaryotes. It consists of green sulfur bacteria, so-called epibionts, which surround a central, motile, chemotrophic bacterium. Four putative symbiosis genes of the epibiont were recovered by suppression subtractive hybridization and bioinformatics approaches. These genes are transcribed constitutively and do not occur in the free-living relatives of the epibiont. The haemagglutinin-like putative gene products of open reading frames (ORFs) Cag0614 and Cag0616 are unusually large and contain repetitive regions and RGD tripeptides. Cag0616 harbours two betagamma-crystalline Greek key motifs. Cag1920 codes for a putative haemolysin whereas the gene product of Cag1919 is a putative RTX-like protein. Based on detailed analyses of Cag1919, the C-terminal amino acid sequence comprises six repetitions of the motif GGXGXD predicted to form a Ca(2+)-binding beta roll. Intact 'C. aggregatum' consortia disaggregated upon the addition of EGTA or pyrophosphate, but stayed intact in the presence of various lectine-binding sugars or proteolytic enzymes. Unlike other RTX toxins, a gene product of Cag1919 could not be d...Continue Reading

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Dec 22, 2010·Molecular Biology and Evolution·Klaus SchliepEric Bapteste
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