Rapid engineering of polyketide overproduction by gene transfer to industrially optimized strains.

Abstract:

:Development of natural products for therapeutic use is often hindered by limited availability of material from producing organisms. The speed at which current technologies enable the cloning, sequencing, and manipulation of secondary metabolite genes for production of novel compounds has made it impractical to optimize each new organism by conventional strain improvement procedures. We have exploited the overproduction properties of two industrial organisms- Saccharopolyspora erythraea and Streptomyces fradiae, previously improved for erythromycin and tylosin production, respectively-to enhance titers of polyketides produced by genetically modified polyketide synthases (PKSs). An efficient method for delivering large PKS expression vectors into S. erythraea was achieved by insertion of a chromosomal attachment site ( attB) for phiC31-based integrating vectors. For both strains, it was discovered that only the native PKS-associated promoter was capable of sustaining high polyketide titers in that strain. Expression of PKS genes cloned from wild-type organisms in the overproduction strains resulted in high polyketide titers whereas expression of the PKS gene from the S. erythraea overproducer in heterologous hosts resulted in only normal titers. This demonstrated that the overproduction characteristics are primarily due to mutations in non-PKS genes and should therefore operate on other PKSs. Expression of genetically engineered erythromycin PKS genes resulted in production of erythromycin analogs in greatly superior quantity than obtained from previously used hosts. Further development of these hosts could bypass tedious mutagenesis and screening approaches to strain improvement and expedite development of compounds from this valuable class of natural products.

authors

Rodriguez E,Hu Z,Ou S,Volchegursky Y,Hutchinson CR,McDaniel R

doi

10.1007/s10295-003-0045-1

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

480-8

issue

8

eissn

1367-5435

issn

1476-5535

journal_volume

30

pub_type

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