细菌脂蛋白是一种脂质修饰的膜蛋白,参与细胞膜合成等多种重要生理过程。脂蛋白形成过程依赖于Lol转运系统,该蛋白最先在细胞质中以前体的形式合成,然后在细胞膜上被加工为成熟脂蛋白,锚定于细菌外膜周质侧。Lol系统由LolA-E五种蛋白组...细菌脂蛋白是一种脂质修饰的膜蛋白,参与细胞膜合成等多种重要生理过程。脂蛋白形成过程依赖于Lol转运系统,该蛋白最先在细胞质中以前体的形式合成,然后在细胞膜上被加工为成熟脂蛋白,锚定于细菌外膜周质侧。Lol系统由LolA-E五种蛋白组成,其中脂蛋白在周质空间中依赖伴侣蛋白LolA进行转运,LolA将脂蛋白以"mouth to mouth"的方式从LolCDE转运至LolB,进而完成脂蛋白定位。重点对周质分子伴侣LolA结构、参与的转运体系及其生物学功能进行综述,旨在通过对脂蛋白转运分子机制的理解为感染性疾病的治疗提供更多的药物靶点。展开更多
Flagellar biosynthesis and motility are subject to a four-tiered transcriptional regulatory circuit in Pseudomonas,and the master regulator FleQ appears to be the highest-level regulator in this hierarchical regulator...Flagellar biosynthesis and motility are subject to a four-tiered transcriptional regulatory circuit in Pseudomonas,and the master regulator FleQ appears to be the highest-level regulator in this hierarchical regulatory cascade.Pseudomonas stutzeri A1501 is motile by a polar flagellum;however,the motility and regulatory mechanisms involved in this process are unknown.Here,we searched the A1501 genome for flagella and motility genes and found that approximately 50 genes,which were distributed in three non-contiguous chromosomal regions,contribute to the formation,regulation and function of the flagella.The non-polar mutation of fleQ impaired flagellar biosynthesis,motility and root colonization but enhanced biofilm formation.FleQ positively regulates the expression of flagellar class Ⅱ-Ⅳ genes,suggesting a regulatory cascade that is coordinated similar to that of the well-known P.aeruginosa.Based on our results,we propose that flagellar genes in P.stutzeri A1501 are regulated in a cascade regulated by FleQ and that flagellum-driven motility properties may be necessary for competitive rhizosphere colonization.展开更多
文摘细菌脂蛋白是一种脂质修饰的膜蛋白,参与细胞膜合成等多种重要生理过程。脂蛋白形成过程依赖于Lol转运系统,该蛋白最先在细胞质中以前体的形式合成,然后在细胞膜上被加工为成熟脂蛋白,锚定于细菌外膜周质侧。Lol系统由LolA-E五种蛋白组成,其中脂蛋白在周质空间中依赖伴侣蛋白LolA进行转运,LolA将脂蛋白以"mouth to mouth"的方式从LolCDE转运至LolB,进而完成脂蛋白定位。重点对周质分子伴侣LolA结构、参与的转运体系及其生物学功能进行综述,旨在通过对脂蛋白转运分子机制的理解为感染性疾病的治疗提供更多的药物靶点。
基金supported by grants from the National Basic Research(973) Program of China(2015CB755700)the National High-Tech R&D(863) Program of China (2012AA02A703)+2 种基金the National Natural Science Foundation of China(31170081)the Special Fund for Agro-scientific Research in the Public Interest,China(201103007)the Guangdong Innovative and Entrepreneurial Research Team Program,China(2013S033).
文摘Flagellar biosynthesis and motility are subject to a four-tiered transcriptional regulatory circuit in Pseudomonas,and the master regulator FleQ appears to be the highest-level regulator in this hierarchical regulatory cascade.Pseudomonas stutzeri A1501 is motile by a polar flagellum;however,the motility and regulatory mechanisms involved in this process are unknown.Here,we searched the A1501 genome for flagella and motility genes and found that approximately 50 genes,which were distributed in three non-contiguous chromosomal regions,contribute to the formation,regulation and function of the flagella.The non-polar mutation of fleQ impaired flagellar biosynthesis,motility and root colonization but enhanced biofilm formation.FleQ positively regulates the expression of flagellar class Ⅱ-Ⅳ genes,suggesting a regulatory cascade that is coordinated similar to that of the well-known P.aeruginosa.Based on our results,we propose that flagellar genes in P.stutzeri A1501 are regulated in a cascade regulated by FleQ and that flagellum-driven motility properties may be necessary for competitive rhizosphere colonization.
