Enhancing solubility of deoxyxylulose phosphate pathway enzymes for microbial isoprenoid production View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2012-12

AUTHORS

Kang Zhou, Ruiyang Zou, Gregory Stephanopoulos, Heng-Phon Too

ABSTRACT

BACKGROUND: Recombinant proteins are routinely overexpressed in metabolic engineering. It is well known that some over-expressed heterologous recombinant enzymes are insoluble with little or no enzymatic activity. This study examined the solubility of over-expressed homologous enzymes of the deoxyxylulose phosphate pathway (DXP) and the impact of inclusion body formation on metabolic engineering of microbes. RESULTS: Four enzymes of this pathway (DXS, ISPG, ISPH and ISPA), but not all, were highly insoluble, regardless of the expression systems used. Insoluble dxs (the committed enzyme of DXP pathway) was found to be inactive. Expressions of fusion tags did not significantly improve the solubility of dxs. However, hypertonic media containing sorbitol, an osmolyte, successfully doubled the solubility of dxs, with the concomitant improvement in microbial production of the metabolite, DXP. Similarly, sorbitol significantly improved the production of soluble and functional ERG12, the committed enzyme in the mevalonate pathway. CONCLUSION: This study demonstrated the unanticipated findings that some over-expressed homologous enzymes of the DXP pathway were highly insoluble, forming inclusion bodies, which affected metabolite formation. Sorbitol was found to increase both the solubility and function of some of these over-expressed enzymes, a strategy to increase the production of secondary metabolites. More... »

PAGES

148

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/1475-2859-11-148

DOI

http://dx.doi.org/10.1186/1475-2859-11-148

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051753805

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/23148661


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