Suppr超能文献

参与组氨酸和色氨酸生物合成的一种假定的类古异构体酶的出现。

Occurrence of a putative ancient-like isomerase involved in histidine and tryptophan biosynthesis.

作者信息

Barona-Gómez Francisco, Hodgson David A

机构信息

Department of Biological Sciences, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.

出版信息

EMBO Rep. 2003 Mar;4(3):296-300. doi: 10.1038/sj.embor.embor771.

Abstract

We report the occurrence of an isomerase with a putative (betaalpha)(8)-barrel structure involved in both histidine and trypto-phan biosynthesis in Streptomyces coelicolor A3(2) and Mycobacterium tuberculosis HR37Rv. Deletion of a hisA homologue (SCO2050) putatively encoding N'-[(5'-phosphoribosyl)-formimino]-5 amino-imidazole-4-carboxamide ribonucleotide isomerase from the chromosome of S. coelicolor A3(2) generated a double auxotrophic mutant for histidine and tryptophan. The bifunctional gene SCO2050 and its orthologue Rv1603 from M. tuberculosis complemented both hisA and trpF mutants of Escherichia coli. Expression of the E. coli trpF gene in the S. coelicolor mutant only complemented the tryptophan auxo-trophy, and the hisA gene only complemented the histidine auxotrophy. The discovery of this enzyme, which has a broad-substrate specificity, has implications for the evolution of metabolic pathways and may prove to be important for understanding the evolution of the (betaalpha)(8)-barrels.

摘要

我们报道了在天蓝色链霉菌A3(2)和结核分枝杆菌HR37Rv中存在一种具有假定的(betaalpha)(8)-桶状结构的异构酶,该异构酶参与组氨酸和色氨酸的生物合成。从天蓝色链霉菌A3(2)染色体上缺失一个假定编码N'-[(5'-磷酸核糖基)-甲脒基]-5-氨基咪唑-4-甲酰胺核糖核苷酸异构酶的hisA同源物(SCO2050),产生了一个组氨酸和色氨酸双营养缺陷型突变体。来自结核分枝杆菌的双功能基因SCO2050及其直向同源物Rv1603补充了大肠杆菌的hisA和trpF突变体。在天蓝色链霉菌突变体中表达大肠杆菌trpF基因仅补充了色氨酸营养缺陷,而hisA基因仅补充了组氨酸营养缺陷。这种具有广泛底物特异性的酶的发现,对代谢途径的进化具有启示意义,并且可能被证明对理解(betaalpha)(8)-桶状结构的进化很重要。

相似文献

引用本文的文献

本文引用的文献

5
Divergent evolution of (betaalpha)8-barrel enzymes.(βα)8桶状酶的趋异进化。
Biol Chem. 2001 Sep;382(9):1315-20. doi: 10.1515/BC.2001.163.
9
Massive gene decay in the leprosy bacillus.麻风杆菌中的大规模基因衰退。
Nature. 2001 Feb 22;409(6823):1007-11. doi: 10.1038/35059006.

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验