Identification and analysis of four candidate symbiosis genes from 'Chlorochromatium aggregatum', a highly developed bacterial symbiosis.
Identification and analysis of four candidate symbiosis genes from 'Chlorochromatium aggregatum', a highly developed bacterial symbiosis.
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高度发达的细菌共生体“Chlorochromatiumaggregatum”中四个候选共生基因的鉴定和分析
DOI:
10.1111/j.1462-2920.2008.01709.x
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发表时间:
2008
影响因子:
5.1
通讯作者:
Overmann
中科院分区:
文献类型:
--
作者:
Wenter;Dressen;Schlickenrieder;Plöscher;Eichacker;Overmann
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 βγ‐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 Ca2+‐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 detected by45Ca2+autoradiography, indicating a low abundance of the corresponding protein in the cells. The RTX‐type C‐terminus coded by Cag1919 exhibited a significant similarity to RTX modules of various proteobacterial proteins, suggesting that this putative symbiosis gene has been acquired via horizontal gene transfer from a proteobacterium.
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影响因子:
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作者:
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作者:
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通讯作者:
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DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
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通讯作者:
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