NADH plays the vital role for chiral pure D‐(−)‐2, 3‐butanediol production in Bacillus subtilis under limited oxygen conditions. Issue 10 (28th May 2014)

• Record Type: Journal Article
• Authors: Fu, Jing; Wang, Zhiwen; Chen, Tao; Liu, Weixi; Shi, Ting; Wang, Guanglu; Tang, Ya‐jie; Zhao, Xueming
• Is Part Of: Biotechnology and bioengineering. Volume 111:Issue 10(2014:Oct.)
• Page Start: 2126
• Page End: 2131
• Publication Date: 2014-05-28
• Subjects: Biotechnology -- Periodicals; Bioengineering -- Periodicals; 660.6
• DOI: 10.1002/bit.25265
• Languages: English
• ISSNs: 0006-3592

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>ABSTRACT</title> <sec id="bit25265-sec-0001" sec-type="section"> <p>Compared with traditional pathogenic producers, <italic>Bacillus subtilis</italic> as a Class I microorganism offers many advantages for industrial‐scale 2, 3‐butanediol production. Unlike previous reports in which two stereoisomers (with a ratio of 3:2) were produced, we first found that wild type <italic>B. subtilis</italic> 168 generates only D‐(−)‐2, 3‐butanediol (purity &gt;99%) under low oxygen conditions. The total high yield of 2, 3‐butanediol and acetoin, and acetoin reductase enzyme assay indicate that it is the high level of NADH availability, instead of high acetoin reductase activity, contributes more to 2, 3‐butanediol production in <italic>B. subtilis</italic>. The strategy for increasing the pool of NADH availability, the key factor for 2, 3‐butanediol production, was designed through low dissolved oxygen control, adding reducing substrates and rationally metabolic engineering. A transhydrogenase encoded by <italic>udhA</italic> was introduced to provide more NADH from NADPH and allowed enhanced 2, 3‐butanediol production. Finally, BSF20 produced 49.29 g/L D(−)‐2, 3‐butanediol. These results demonstrated that <italic>B. subtilis</italic> is a competitive producer for chiral 2, 3‐butanediol production. Biotechnol. Bioeng. 2014;111: 2126–2131. © 2014 Wiley Periodicals, Inc.</p> </sec> </abstract>