文献类型：期刊文献

英文题名：GlnR-mediated regulation of nitrogen metabolism in the actinomycete Saccharopolyspora erythraea

作者：Yao, Li-Li[1];Liao, Cheng-Heng[1];Huang, Gang[1];Zhou, Ying[1];Rigali, Sebastien[2];Zhang, Buchang[3];Ye, Bang-Ce[1]

机构：[1]E China Univ Sci & Technol, Lab Biosyst & Microanal, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[2]Univ Liege, Ctr Prot Engn, Inst Chim B6a, B-4000 Liege, Belgium;[3]Anhui Univ, Sch Life Sci, Inst Hlth Sci, Hefei 230601, Peoples R China

年份：2014

卷号：98

期号：18

起止页码：7935

外文期刊名：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY

收录：;EI(收录号：20143618143355);WOS:【SCI-EXPANDED(收录号:WOS:000341374700024)】；

基金：This study was supported by the China NSF 21276079, SRFDP 20120074110009 of the Chinese Ministry of Education, the National Key Technologies R&D Programs (2007AA02Z331 and 2014AA021502), and the Fundamental Research Funds for the Central Universities. SR is a Research Associate of the FRS-FNRS (Belgium).

语种：英文

外文关键词：Actinomycetes; Nitrogen metabolism; GlnR regulator; Erythromycin; Nitrogen utilization

摘要：Nitrogen source sensing, uptake, and assimilation are central for growth and development of microorganisms which requires the participation of a global control of nitrogen metabolism-associated genes at the transcriptional level. In soil-dwelling antibiotic-producing actinomycetes, this role is played by GlnR, an OmpR family regulator. In this work, we demonstrate that SACE_7101 is the ortholog of actinomycetes' GlnR global regulators in the erythromycin producer Saccharopolyspora erythraea. Indeed, the chromosomal deletion of SACE_7101 severely affects the viability of S. erythraea when inoculated in minimal media supplemented with NaNO3, NaNO2, NH4Cl, glutamine, or glutamate as sole nitrogen source. Combination of in silico prediction of cis-acting elements, subsequent in vitro (through gel shift assays) and in vivo (real-time reverse transcription polymerase chain reaction) validations of the predicted target genes revealed a very large GlnR regulon aimed at adapting the nitrogen metabolism of S. erythraea. Indeed, enzymes/proteins involved in (i) uptake and assimilation of ammonium, (ii) transport and utilization of urea, (iii) nitrite/nitrate, (iv) glutamate/glutamine, (v) arginine metabolism, (vi) nitric oxide biosynthesis, and (vii) signal transduction associated with the nitrogen source supplied have at least one paralog gene which expression is controlled by GlnR. Our work highlights a GlnR-binding site consensus sequence (t/gna/cAC-n(6)-GaAAc) which is similar although not identical to the consensus sequences proposed for other actinomycetes. Finally, we discuss the distinct and common features of the GlnR-mediated transcriptional control of nitrogen metabolism between S. erythraea and the model organism Streptomyces coelicolor.