Identification and characterization of inosine 5-monophosphate dehydrogenase in Streptococcus suis type 2

文献类型： 外文期刊

第一作者： Zhang, Xue-han

作者： Zhang, Xue-han;He, Kong-wang;Duan, Zhi-tao;Zhou, Jun-ming;Yu, Zheng-yu;Ni, Yan-xiu;Zhang, Xue-han;He, Kong-wang;Duan, Zhi-tao;Zhou, Jun-ming;Yu, Zheng-yu;Ni, Yan-xiu;Zhang, Xue-han;He, Kong-wang;Duan, Zhi-tao;Zhou, Jun-ming;Yu, Zheng-yu;Ni, Yan-xiu;Lu, Cheng-ping

作者机构：

关键词： Molecular Genetics: Biochemistry and Molecular Biophysics

期刊名称：MICROBIAL PATHOGENESIS （ 影响因子：3.738； 五年影响因子：3.663 ）

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收录情况： SCI

摘要： Streptococcus suis type 2 is a swine pathogen responsible for diverse diseases. Although many virulent factors have been identified and studied, relatively little is known about the pathogenic mechanisms of type 2. The aim of the study was to identify and understand the characterization of Inosine 5-monophosphate dehydrogenase (IMPDH). A 957-bp gene, impdh, was identified in the virulent S. suis serotype 2 (SS2), and analysis of the predicted IMPDH sequence revealed IMP dehydrogenase/GMP reductase domain. The gene encoding for the IMPDH of S. suis was cloned and sequenced. The DNA sequence contained an open reading frame encoding for a 318 amino acid polypeptide exhibiting 23% sequence identity with the IMPDH from Streptococcus pyogenes (YP281355) and Streptococcus pneumoniae (ZP00404150). Using the pET(32) expression plasmid, the impdh gene was inducibly overexpressed in Escherichia coli to produce IMPDH with a hexahistidyl N-terminus to permit its purification. The (His)6 IMPDH protein was found to possess functional IMPDH enzymatic activity after the purification.The impdh-knockout SS2 mutant (Delta IMPDH) constructed in this study was slower in growth and one pH unit higher than SS2-H after 6 h of culturing, and found to be attenuated in mouse models of infection for 2.5 times and not be capable of causing death in porcine models of infection in contrast with the parent SS2-H.

分类号： R3

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