文献类型： 外文期刊
作者： Zhou, Yidong 1 ; Gao, Siyuan 1 ; Zhang, Mingliang 1 ; Jiang, Wankui 1 ; Ke, Zhijian 1 ; Qiu, Jiguo 1 ; Xu, Jianhong 2 ; H 1 ;
作者机构： 1.Nanjing Agr Univ, Coll Life Sci, Minist Agr, Key Lab Agr Environm Microbiol, Nanjing 210095, Jiangsu, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, Jiangsu Key Lab Food Qual & Safety, State Key Lab Cultivat Base, Nanjing, Peoples R China
关键词： biodegradation; CoA mediated hydroxylation; Rhizobium sp; X9; salicylate
期刊名称：MOLECULAR MICROBIOLOGY （ 影响因子：3.501； 五年影响因子：3.996 ）
ISSN： 0950-382X
年卷期： 2021 年 116 卷 3 期
页码：
收录情况： SCI
摘要： Salicylate is a typical aromatic compound widely distributed in nature. Microbial degradation of salicylate has been well studied and salicylate hydroxylases play essential roles in linking the peripheral and ring-cleavage catabolic pathways. The direct hydroxylation of salicylate catalyzed by salicylate-1-hydroxylase or salicylate-5-hydroxylase has been well studied. However, the CoA mediated salicylate 5-hydroxylation pathway has not been characterized in detail. Here, we elucidate the molecular mechanism of the reaction in the conversion of salicylate to gentisate in the carbaryl-degrading strain Rhizobium sp. X9. Three enzymes (salicylyl-CoA ligase CehG, salicylyl-CoA hydroxylase CehH and gentisyl-CoA thioesterase CehI) catalyzed the conversion of salicylate to gentisate via a route, including CoA thioester formation, hydroxylation and thioester hydrolysis. Further analysis indicated that genes cehGHI are also distributed in other bacteria from terrestrial environment and marine sediments. These genomic evidences highlight the role of this salicylate degradation pathway in the carbon cycle of soil organic compounds and marine sediments. Our findings of this three-step strategy enhanced the current understanding of CoA mediated degradation of salicylate.
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