A Putative Type II Secretion System Is Involved in Cellulose Utilization in Cytophaga hutchisonii.

A Putative Type II Secretion System Is Involved in Cellulose Utilization in Cytophaga hutchisonii.
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一种假定的 II 型分泌系统参与了 Cytophaga hutchisonii 的纤维素利用

DOI:
10.3389/fmicb.2017.01482
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发表时间:
2017
影响因子:
5.2
通讯作者:
Liu W
Liu W
中科院分区:
生物学2区
文献类型:
--
作者:
Wang X;Han Q;Chen G;Zhang W;Liu W

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Cytophaga hutchinsonii是一种滑行的纤维素分解细菌,以底物接触依赖的方式降解纤维素。推测特异性蛋白质被转运至其细胞外环境或外膜表面,以参与与纤维素的粘附和进一步消化。在这项研究中,我们表明,三个orthopathic基因编码的主要成分(T2 S-D,-F,和-G)的II型分泌系统(T2 SS)参与纤维素降解,但不参与细胞运动。三个t2 s基因的单独破坏导致在纤维二糖、再生无定形纤维素和Avicel纤维素上的生长显著延迟。酶分析表明,与WT细胞相比,t2 s突变体细胞的内切葡聚糖酶活性增加,而β-葡糖苷酶活性显著降低。进一步的分析表明,t2 s突变细胞不仅表现出不同的配置文件的纤维素结合的外膜蛋白从野生型细胞,但也显示出显着下降,他们的能力,以坚持纤维素。这些结果表明,假定的T2 SS和纤维素利用之间的功能联系存在于C。hutchinsonii,从而为理解C. hutchinsonii同化纤维素。
Cytophaga hutchinsonii is a gliding cellulolytic bacterium that degrades cellulose in a substrate contact-dependent manner. Specific proteins are speculated to be translocated to its extracellular milieu or outer membrane surface to participate in adhesion to cellulose and further digestion. In this study, we show that three orthologous genes encoding the major components (T2S-D, -F, and -G) of type II secretion system (T2SS) are involved in cellulose degradation but not in cell motility. The individual disruption of the three t2s genes results in a significantly retarded growth on cellobiose, regenerated amorphous cellulose, and Avicel cellulose. Enzymatic analyses demonstrate that, whereas the endoglucanase activity of the t2s mutant cells is increased, the β-glucosidase activity is remarkably reduced compared to that of WT cells. Further analyses reveal that the t2s mutant cells not only exhibit a different profile of cellulose-bound outer membrane proteins from that of wild-type cells, but also display a significant decrease in their capability to adhere to cellulose. These results indicate that a functional link exits between the putative T2SS and cellulose utilization in C. hutchinsonii, and thus provide a conceptual framework to understand the unique strategy deployed by C. hutchinsonii to assimilate cellulose.
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