title: Isolation and characterization of Delftia tsuruhatensis ZJB-05174, capable of R-enantioselective degradation of 2,2-dimethylcyclopropanecarboxamide.
abstract: R-Enantioselective amidases are of considerable industrial interest due to potential applications in the production of optically active compounds. Strain ZJB-05174, capable of R-enantioselective degradation of 2,2-dimethylcyclopropanecarboxamide, was isolated employing a newly established colorimetric screening method. Based on morphology, physiological tests, ATB system (ID 32 GN) and the 16S rRNA sequence, this strain was identified as Delftia tsuruhatensis. The intracellular amidase exhibited excellent thermostability and was not inhibited by urea, a known inhibitor of many amidases. The enantiomeric ratio of intracellular amidase decreased from 27 to 5 when the reaction temperature was increased from 30 to 46 degrees C. A novel temperature-dependent reversal of stereospecificity was observed when the temperature was increased to 56 degrees C. Interestingly, when the reaction was performed at 46 degrees C, cell suspensions pre-incubated at 56 degrees C exhibited the same inversion of stereospecificity.
authors.affiliation: Institute of Bioengineering, Zhejiang University of Technology, Area 6, Chaohui, Hangzhou 310014, PR China.
authors.forename: Ren-Chao
authors.initials: RC
authors.lastname: Zheng
authors.forename: Yuan-Shan
authors.initials: YS
authors.lastname: Wang
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: Liu
authors.forename: Liang-Ying
authors.initials: LY
authors.lastname: Xing
authors.forename: Yu-Guo
authors.initials: YG
authors.lastname: Zheng
authors.forename: Yin-Chu
authors.initials: YC
authors.lastname: Shen
mesh_terms: D000581:Amidohydrolases / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002384:Catalysis / Q000187:drug effects; D003521:Cyclopropanes / Q000737:chemistry / Q000378:metabolism*; D042742:Delftia / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D004795:Enzyme Stability / Q000187:drug effects; D007700:Kinetics; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013237:Stereoisomerism; D013696:Temperature; D014508:Urea / Q000494:pharmacology
chemical_list: C522704:2,2-dimethylcyclopropanecarboxamide; D001426:Bacterial Proteins; D003521:Cyclopropanes; D012336:RNA, Ribosomal, 16S; D014508:Urea; D000581:Amidohydrolases; C019665:amidase