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Sci Rep. 2019 Nov 28;9(1):17851. doi: 10.1038/s41598-019-54229-4.

Transcriptional control of central carbon metabolic flux in Bifidobacteria by two functionally similar, yet distinct LacI-type regulators.

Author information

1
School of Microbiology & APC Microbiome Ireland, University College Cork, Ireland University College Cork, Cork, Ireland.
2
Sanford Burnham Prebys Medical Discovery Institute, La Jolla, United States.
3
A.A. Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia.
4
Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland.
5
School of Microbiology & APC Microbiome Ireland, University College Cork, Ireland University College Cork, Cork, Ireland. d.vansinderen@ucc.ie.

Abstract

Bifidobacteria resident in the gastrointestinal tract (GIT) are subject to constantly changing environmental conditions, which require rapid adjustments in gene expression. Here, we show that two predicted LacI-type transcription factors (TFs), designated AraQ and MalR1, are involved in regulating the central, carbohydrate-associated metabolic pathway (the so-called phosphoketolase pathway or bifid shunt) of the gut commensal Bifidobacterium breve UCC2003. These TFs appear to not only control transcription of genes involved in the bifid shunt and each other, but also seem to commonly and directly affect transcription of other TF-encoding genes, as well as genes related to uptake and metabolism of various carbohydrates. This complex and interactive network of AraQ/MalR1-mediated gene regulation provides previously unknown insights into the governance of carbon metabolism in bifidobacteria.

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