Lack of a surface layer in Tannerella forsythia mutants deficient in the type IX secretion system.

Lack of a surface layer in Tannerella forsythia mutants deficient in the type IX secretion system.
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连翘坦纳菌突变体缺乏表面层,缺乏 IX 型分泌系统。

DOI:
10.1099/mic.0.080192-0
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发表时间:
2014-10
期刊:
Microbiology (Reading, England)
影响因子:
--
通讯作者:
Nakayama K
Nakayama K
中科院分区:
其他
文献类型:
--
作者:
Narita Y;Sato K;Yukitake H;Shoji M;Nakane D;Nagano K;Yoshimura F;Naito M;Nakayama K

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连翘Tannerella forsythia是一种革兰氏阴性厌氧菌,是牙周病的重要病原体。这种细菌拥有编码IX型分泌系统(T9SS)所有已知成分的基因。构建了缺乏t9ss编码基因porK、porT和sov同源基因的连翘突变体。所有的porK、porT和sov单突变体都缺乏s层,表达较少糖基化的s层糖蛋白TfsA和TfsB。此外,这些突变体表现出血液凝集减少和生物膜形成增加。猪肉和WT菌株分泌的蛋白质比较表明,含有c末端结构域(CTD)样序列的一些蛋白质的分泌依赖于猪肉基因。这些结果表明,T9SS在连翘中起作用,并参与CTD蛋白向细胞表面或细胞外环境的易位。
Tannerella forsythia, a Gram-negative anaerobic bacterium, is an important pathogen in periodontal disease. This bacterium possesses genes encoding all known components of the type IX secretion system (T9SS). T. forsythia mutants deficient in genes orthologous to the T9SS-encoding genes porK, porT and sov were constructed. All porK, porT and sov single mutants lacked the surface layer (S-layer) and expressed less-glycosylated versions of the S-layer glycoproteins TfsA and TfsB. In addition, these mutants exhibited decreased haemagglutination and increased biofilm formation. Comparison of the proteins secreted by the porK and WT strains revealed that the secretion of several proteins containing C-terminal domain (CTD)-like sequences is dependent on the porK gene. These results indicate that the T9SS is functional in T. forsythia and contributes to the translocation of CTD proteins to the cell surface or into the extracellular milieu.
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