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细菌硫化离子通道的识别和表征

Bryan K Czyzewski¹, Da-Neng Wang

¹The Helen L. and Martin S. Kimmel Center for Biology and Medicine at the Skirball Institute of Biomolecular Medicine, New York University School of Medicine, 540 First Avenue, New York, New York 10016, USA.

|March 13, 2012

概括

研究人员在Clostridium difficile中发现了一种新的硫化离子通道,对于出口有毒硫化 (H(2) S) 和硫化离子 (HS(-)) 维持细胞功能至关重要.

科学领域:

微生物学微生物学
生物化学生物化学
分子生物学分子生物学

背景情况:

硫化 (H(2) S) 和硫化离子 (HS(-)) 在细胞信号和新陈代谢中至关重要,特别是在无氧细菌生长中.
这些化合物是硫酸盐还原途径的产物,在高度下可能有毒,需要细胞出口机制.

研究的目的:

识别和描述病原体Clostridium difficile中对硫化离子出口负责的分子机制.
了解新发现的HS(-) 通道的结构和功能.

主要方法:

用基因,生化和功能分析来识别和验证HS(-) 通道.
结晶结构的确定揭示了该通道的保存离子选择性过器和结构特征.

主要成果:

在Clostridium difficile中发现了一种新型的硫化离子通道,属于酸盐/酸盐输送体家族.
该通道对HS(-) 离子,酸盐和酸盐具有透性,由于其保存的离子选择性过器,它表现出多特异性.
该通道显示低开放概率和严格调节以保持质子梯度.

结论:

已识别的HS(-) 通道对于控制Clostridium difficile中有毒硫化物水平至关重要.
这一发现扩大了已知的甲酸盐/亚酸盐输送器子家族,包括专门的HS(-) 通道.
该通道的调节性和多特异性为细胞平衡和潜在的治疗点提供了洞察力.

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