Assembly of a novel biosynthetic pathway for gentamicin B production in Micromonospora echinospora View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-12

AUTHORS

Xianpu Ni, Zhenpeng Sun, Yawen Gu, Hao Cui, Huanzhang Xia

ABSTRACT

BACKGROUND: Isepamicin is a weakly toxic but highly active aminoglycoside antibiotic derivative of gentamicin B. Gentamicin B is a naturally occurring minor component isolated from Micromonospora echinospora. 2'-NH2-containing gentamicin C complex is a dominant compound produced by wild-type M. echinospora; by contrast, 2'-OH-containing gentamicin B is produced as a minor component. However, the biosynthetic pathway of gentamicin B remains unclear. Considering that gentamicin B shares a unique C2' hydroxyl group with kanamycin A, we aimed to design a new biosynthetic pathway of gentamicin B by combining twelve steps of gentamicin biosynthesis and two steps of kanamycin biosynthesis. RESULTS: We blocked the biosynthetic pathway of byproducts and generated a strain overproducing JI-20A, which was used as a precursor of gentamicin B biosynthesis, by disrupting genK and genP. The amount of JI-20A produced in M. echinospora ∆K∆P reached 911 μg/ml, which was 14-fold higher than that of M. echinospora ∆P. The enzymes KanJ and KanK necessary to convert 2'-NH2 into 2'-OH from the kanamycin biosynthetic pathway were heterologously expressed in M. echinospora ΔKΔP to transform JI-20A into gentamicin B. The strain with kanJK under PermE* could produce 80 μg/ml of gentamicin B, which was tenfold higher than that of the wild-type strain. To enhance gentamicin B production, we employed different promoters and gene integration combinations. When a PhrdB promoter was used and kanJ and kanK were integrated in the genome through gene replacement, gentamicin B was generated as the major product with a maximum yield of 880 μg/ml. CONCLUSION: We constructed a new biosynthetic pathway of high-level gentamicin B production; in this pathway, most byproducts were removed. This method also provided novel insights into the biosynthesis of secondary metabolites via the combinatorial biosynthesis. More... »

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Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s12934-015-0402-6

DOI

http://dx.doi.org/10.1186/s12934-015-0402-6

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https://app.dimensions.ai/details/publication/pub.1030953437

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26729212


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