Biochemical Basis of Xylooligosaccharide Utilisation by Gut Bacteria

Xylan is one of the major structural components of the plant cell wall. Xylan present in the human diet reaches the large intestine undigested and becomes a substrate to species of the gut microbiota. Here, we characterised the capacity of and strains to utilise xylan derivatives. We showed that ATC...

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Veröffentlicht in:International journal of molecular sciences 2022-03, Vol.23 (6), p.2992
Hauptverfasser: Singh, Ravindra Pal, Bhaiyya, Raja, Thakur, Raksha, Niharika, Jayashree, Singh, Chandrajeet, Latousakis, Dimitrios, Saalbach, Gerhard, Nepogodiev, Sergey A, Singh, Praveen, Sharma, Sukesh Chander, Sengupta, Shantanu, Juge, Nathalie, Field, Robert A
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container_issue 6
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container_title International journal of molecular sciences
container_volume 23
creator Singh, Ravindra Pal
Bhaiyya, Raja
Thakur, Raksha
Niharika, Jayashree
Singh, Chandrajeet
Latousakis, Dimitrios
Saalbach, Gerhard
Nepogodiev, Sergey A
Singh, Praveen
Sharma, Sukesh Chander
Sengupta, Shantanu
Juge, Nathalie
Field, Robert A
description Xylan is one of the major structural components of the plant cell wall. Xylan present in the human diet reaches the large intestine undigested and becomes a substrate to species of the gut microbiota. Here, we characterised the capacity of and strains to utilise xylan derivatives. We showed that ATCC 53608 and ATCC 27340 produced β-D-xylosidases, enabling growth on xylooligosaccharide (XOS). The recombinant enzymes were highly active on artificial ( -nitrophenyl β-D-xylopyranoside) and natural (xylobiose, xylotriose, and xylotetraose) substrates, and showed transxylosylation activity and tolerance to xylose inhibition. The enzymes belong to glycoside hydrolase family 120 with Asp as nucleophile and Glu as proton donor, as shown by homology modelling and confirmed by site-directed mutagenesis. In silico analysis revealed that these enzymes were part of a gene cluster in but not in strains, and quantitative proteomics identified other enzymes and transporters involved in XOS utilisation. Based on these findings, we proposed a model for an XOS metabolism pathway in and strains. Together with phylogenetic analyses, the data also revealed the extended xylanolytic potential of the gut microbiota.
doi_str_mv 10.3390/ijms23062992
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source MDPI - Multidisciplinary Digital Publishing Institute; MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central
subjects Bacteria
Bacteria - genetics
Bacteria - metabolism
Cell walls
Digestive system
Enzymes
Genes
Genomes
Glucuronates
Glycosidases
Glycoside hydrolase
Gram-positive bacteria
Homology
Humans
Hydrolase
Intestinal microflora
Intestine
Large intestine
Microbiota
Oligosaccharides
Phylogeny
Proteomics
Site-directed mutagenesis
Strains (organisms)
Substrate Specificity
Xylan
Xylans - metabolism
Xylopyranoside
Xylosidases - metabolism
title Biochemical Basis of Xylooligosaccharide Utilisation by Gut Bacteria
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