Evidence for the presence of an alternative glucose transport system in Clostridium beijerinckii NCIMB 8052 and the solvent-hyperproducing mutant BA101

Jieun Lee, Wilfrid J. Mitchell, Martin Tangney, H. P. Blaschek

Research output: Contribution to journalArticle

Abstract

The effects of substrate analogs and energy inhibitors on glucose uptake and phosphorylation by Clostridium beijerinckii provide evidence for the operation of two uptake systems: a previously characterized phosphoenol- pyruvate-dependent phosphotransferase system (PTS) and a non-PTS system probably energized by the transmembrane proton gradient. In both wild-type C. beijerinckii NCIMB 8052 and the butanol-hyperproducing mutant BA101, PTS activity declined at the end of exponential growth, while glucokinase activity increased in the later stages of fermentation. The non-PTS uptake system, together with enhanced glucokinase activity, may provide an explanation for the ability of the mutant to utilize glucose more effectively during fermentation despite the fact that it is partially defective in PTS activity. Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Original languageEnglish
Pages (from-to)3384-3387
Number of pages4
JournalApplied and Environmental Microbiology
Volume71
Issue number6
DOIs
Publication statusPublished - Jun 2005

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