A Novel Iron Transporter SPD_1590 in Streptococcus pneumoniae Contributing to Bacterial Virulence Properties.

A Novel Iron Transporter SPD_1590 in Streptococcus pneumoniae Contributing to Bacterial Virulence Properties.
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肺炎链球菌中一种新型铁转运蛋白 SPD_1590 有助于细菌毒力特性

DOI:
10.3389/fmicb.2018.01624
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发表时间:
2018
影响因子:
5.2
通讯作者:
Sun X
Sun X
中科院分区:
生物学2区
文献类型:
--
作者:
Miao X;He J;Zhang L;Zhao X;Ge R;He QY;Sun X

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肺炎链球菌是一种革兰氏阳性的人类病原体,已进化出三种主要的从宿主获取铁的转运蛋白:PiaABC、PiuABC和PitABC。我们先前的研究表明,在ΔpiuA/ΔpiaA/ΔpITA三个突变体中,Spd_1590的基因和蛋白水平显著上调,提示Spd_1590可能是肺炎链球菌中一种新的铁转运蛋白。在本研究中,利用spd_1590基因敲除、互补和过表达的菌株和纯化的Spd_1590蛋白,我们证明Spd_1590可以与氯化血红素结合,可能补充了PiuABC的功能,为细菌提供必要的铁。此外,iTRAQ定量蛋白质组学和细胞感染研究的结果表明,与其他金属离子摄取蛋白类似,Spd_1590对细菌的毒力特性是重要的。总体而言,这些结果提供了对这种临床重要细菌的生物学更好的理解。
Streptococcus pneumoniae, a Gram-positive human pathogen, has evolved three main transporters for iron acquisition from the host: PiaABC, PiuABC, and PitABC. Our previous study had shown that the mRNA and protein levels of SPD_1590 are significantly upregulated in the ΔpiuA/ΔpiaA/ΔpitA triple mutant, suggesting that SPD_1590 might be a novel iron transporter in S. pneumoniae. In the present study, using spd1590-knockout, -complemented, and -overexpressing strains and the purified SPD_1590 protein, we show that SPD_1590 can bind hemin, probably supplementing the function of PiuABC, to provide the iron necessary for the bacterium. Furthermore, the results of iTRAQ quantitative proteomics and cell-infection studies demonstrate that, similarly to other metal-ion uptake proteins, SPD_1590 is important for bacterial virulence properties. Overall, these results provide a better understanding of the biology of this clinically important bacterium.
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