title: Biosynthesis of paromamine derivatives in engineered Escherichia coli by heterologous expression.
abstract: OBJECTIVE
  Paromamine is a vital and common intermediate in the biosynthesis of 4,5 and 4,6-disubstituted 2-deoxystreptamine (DOS)-containing aminoglycosides. Our aim is to develop an engineered Escherichia coli system for heterologous production of paromamine.
  
  
  RESULTS
  We have constructed a mutant of E. coli BL21 (DE3) by disrupting glucose-6-phosphate isomerase (pgi) of primary metabolic pathway to increase glucose-6-phosphate pool inside the host. Disruption was carried out by lambda Red/ET recombination following the protocol mentioned in the kit. Recombinants bearing 2-deoxy-scyllo-inosose (DOI), DOS and paromamine producing genes were constructed from butirosin gene cluster and heterologously expressed in engineered host designed as E. coli BL21 (DE3) Delta pgi. Secondary metabolites produced by the recombinants fermentated in 2YTG medium were extracted, and analysis of the extracts showed there is formation of DOI, DOS and paromamine.
  
  
  CONCLUSIONS
  Escherichia coli system is engineered for heterologous expression of paromamine derivatives of aminoglycoside biosynthesis.
  
  
  CONCLUSIONS
  This is the first report of heterologous expression of paromamine gene set in E. coli. Hence a new platform is established in E. coli system for the production of paromamine which is useful for the exploration of novel aminoglycosides by combinatorial biosynthesis of 4,5- and 4,6-disubtituted route of DOS-containing aminoglycosides.
authors.affiliation: Department of Pharmaceutical Engineering, Institute of Biomolecule Reconstruction, Sun Moon University, Asan-si, Chungnam, Korea.
authors.forename: N P
authors.initials: NP
authors.lastname: Kurumbang
authors.forename: K
authors.initials: K
authors.lastname: Liou
authors.forename: J K
authors.initials: JK
authors.lastname: Sohng
mesh_terms: D000617:Aminoglycosides / Q000096:biosynthesis* / Q000235:genetics*; D001407:Bacillus / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins / Q000235:genetics; D015870:Gene Expression; D005956:Glucose-6-Phosphate Isomerase / Q000235:genetics; D006595:Hexosamines / Q000096:biosynthesis / Q000235:genetics; D007294:Inositol / Q000031:analogs & derivatives / Q000096:biosynthesis / Q000235:genetics; D005810:Multigene Family; D015202:Protein Engineering
chemical_list: D000617:Aminoglycosides; D029968:Escherichia coli Proteins; D006595:Hexosamines; D007294:Inositol; C005936:paromamine; C075548:2-deoxyinosose; D005956:Glucose-6-Phosphate Isomerase; C554958:pgi protein, E coli; C007265:2-deoxystreptamine