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OALib Journal期刊
ISSN: 2333-9721
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枯草芽孢杆菌中多聚-γ-谷氨酸的生物合成及其调控机制
DOI: 10.3724/SP.J.1145.2013.00575, PP. 575-580
Keywords: 多聚-γ-谷氨酸,芽孢杆菌,群体感应,双组份调节系统,群聚运动
Abstract:
芽孢杆菌属（bacillus）细菌及少数其他细菌可产生多聚-γ-谷氨酸（poly-γ-glutamicacids，缩写为γ-pga），这是一类可溶、能降解、有多种用途的生物高分子材料，这种高分子物质还参与某些细菌的荚膜形成.pga合成酶复合体与细胞质膜相连，在枯草芽孢杆菌（包括纳豆菌）和炭疽菌中分别由pgsbcae和capbcade基因簇编码.在枯草芽孢杆菌中pgsbcae的表达和γ-pga生物合成受到群体感应（quorumsensing）系统及其它信号转导途径构成的复杂网络所调控，与细菌芽孢形成、自然感受态诱导、次生代谢物质合成和群聚运动等重要过程相互关联，共同对芽孢杆菌的环境适应和生存发挥着关键的作用.本文总结和评述了芽孢杆菌γ-pga生物合成及相关调控机制研究的新进展，特别是信号转导网络中两个小分子多肽degq和swra的功能.这两个小分子介导群体感应系统和degs-degu二组分系统之间的相互作用，共同调控γ-pga的生物合成.对pga合成调控机制的了解可为γ-pga高产工程菌株的构建和生产工艺设计等提供参考.图3参48
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