| Title |
Neomycin biosynthesis is regulated positively by AfsA-g and NeoR in Streptomyces fradiae CGMCC 4.7387
|
|---|---|
| Published in |
Science China Life Sciences, August 2017
|
| DOI | 10.1007/s11427-017-9120-8 |
| Pubmed ID | |
| Authors |
Xiangxi Meng, Wenzhao Wang, Zhoujie Xie, Pengwei Li, Yue Li, Zhengyan Guo, Yingjian Lu, Jie Yang, Kaile Guan, Zhaoxin Lu, Huarong Tan, Yihua Chen |
| Abstract |
Neomycins are a group of aminoglycoside antibiotics with both clinical and agricultural applications. To elucidate the regulatory mechanism of neomycin biosynthesis, we completed draft genome sequencing of a neomycin producer Streptomyces fradiae CGMCC 4.7387 from marine sediments, and the neomycin biosynthesis gene cluster was identified. Inactivation of the afsA-g gene encoding a γ-butyrolactone (GBL) synthase in S. fradiae CGMCC 4.7387 resulted in a significant decrease of neomycin production. Quantitative RT-PCR analysis revealed that the transcriptional level of neoR and the aphA-neoGH operon were reduced in the afsA-g::aac(3)IV mutant. Interestingly, a conserved binding site of AdpA, a key activator in the GBL regulatory cascade, was discovered upstream of neoR, a putative regulatory gene encoding a protein with an ATPase domain and a tetratricopeptide repeat domain. When neoR was inactivated, the neomycin production was reduced about 40% in comparison with the WT strain. Quantitative RT-PCR analysis revealed that the transcriptional levels of genes in the aphA-neoGH operon were reduced clearly in the neoR::aac(3)IV mutant. Finally, the titers of neomycin were improved considerably by overexpression of afsA-g and neoR in S. fradiae CGMCC 4.7387. |
X Demographics
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United Kingdom | 1 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 1 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 12 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 12 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Doctoral Student | 3 | 25% |
| Student > Master | 2 | 17% |
| Student > Ph. D. Student | 2 | 17% |
| Other | 1 | 8% |
| Student > Bachelor | 1 | 8% |
| Other | 0 | 0% |
| Unknown | 3 | 25% |
| Readers by discipline | Count | As % |
|---|---|---|
| Biochemistry, Genetics and Molecular Biology | 3 | 25% |
| Pharmacology, Toxicology and Pharmaceutical Science | 1 | 8% |
| Environmental Science | 1 | 8% |
| Agricultural and Biological Sciences | 1 | 8% |
| Medicine and Dentistry | 1 | 8% |
| Other | 0 | 0% |
| Unknown | 5 | 42% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 17 August 2017.
All research outputs
#20,442,790
of 22,997,544 outputs
Outputs from Science China Life Sciences
#774
of 1,009 outputs
Outputs of similar age
#277,277
of 317,683 outputs
Outputs of similar age from Science China Life Sciences
#27
of 36 outputs
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