Over-expression of xylulokinase in a xylose-metabolising recombinant strain of Zymomonas mobilis

Yae Jeon. Jeon, Charles J. Svenson, Peter L. Rogers

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The broad host range vector pBBR1MCS-2 has been evaluated as an expression vector for Zymomonas mobilis. The transformation efficiency of this vector was 2 × 103 CFU per 'g of DNA in a recombinant strain of Z. mobilis ZM4/AcR containing the plasmid pZB5. Stable replication for this expression vector was demonstrated for 50 generations. This vector was used to study xylose metabolism in acetate resistant Z. mobilis ZM4/AcR (pZB5) by over-expression of xylulokinase (XK), as previous studies had suggested that XK could be the rate-limiting enzyme for such strains. Based on the above vector, a recombinant plasmid pJX1 harboring xylB (expressing XK) under control of a native Z. mobilis promotor Ppdc was constructed. When this plasmid was introduced into ZM4/AcR (pZB5) a 3-fold higher XK expression was found compared to the control strain. However, fermentation studies with ZM4/AcR (pZB5, pJX1) on xylose medium did not result in any increase in rate of growth or xylose metabolism, suggesting that XK expression was not rate-limiting for ZM4/AcR (pZB5) and related strains.
Original languageEnglish
Pages (from-to)85-92
Number of pages8
JournalFEMS Microbiology Letters
Volume244
Issue number1
DOIs
Publication statusPublished - 2005

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