The myo-inositol/proton symporter IolT1 contributes to d-xylose uptake in Corynebacterium glutamicum

Christian Brüsseler, Andreas Radek, Niklas Tenhaef, Karin Krumbach, Stephan Noack, Jan Marienhagen*

*Korrespondierende/r Autor/-in für diese Arbeit

Abstract

Corynebacterium glutamicum has been engineered to utilize d-xylose as sole carbon and energy source. Recently, a C. glutamicum strain has been optimized for growth on defined medium containing d-xylose by laboratory evolution, but the mutation(s) attributing to the improved-growth phenotype could not be reliably identified. This study shows that loss of the transcriptional repressor IolR is responsible for the increased growth performance on defined d-xylose medium in one of the isolated mutants. Underlying reason is derepression of the gene for the glucose/myo-inositol permease IolT1 in the absence of IolR, which could be shown to also contribute to d-xylose uptake in C. glutamicum. IolR-regulation of iolT1 could be successfully repealed by rational engineering of an IolR-binding site in the iolT1-promoter. This minimally engineered C. glutamicum strain bearing only two nucleotide substitutions mimics the IolR loss-of-function phenotype and allows for a high growth rate on d-xylose-containing media (µmax = 0.24 ± 0.01 h-1).
OriginalspracheEnglisch
ZeitschriftBioresource technology
Jahrgang249
Seiten (von - bis)953-961
Seitenumfang9
ISSN0960-8524
DOIs
PublikationsstatusVeröffentlicht - 02.2018
Extern publiziertJa

DFG-Fachsystematik

  • 2.11-01 Biochemie

Fingerprint

Untersuchen Sie die Forschungsthemen von „The myo-inositol/proton symporter IolT1 contributes to d-xylose uptake in Corynebacterium glutamicum“. Zusammen bilden sie einen einzigartigen Fingerprint.

Zitieren