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Degradation of complex arabinoxylans by human colonic Bacteroidetes.

Abstract：

:Some Bacteroidetes and other human colonic bacteria can degrade arabinoxylans, common polysaccharides found in dietary fiber. Previous work has identified gene clusters (polysaccharide-utilization loci, PULs) for degradation of simple arabinoxylans. However, the degradation of complex arabinoxylans (containing side chains such as ferulic acid, a phenolic compound) is poorly understood. Here, we identify a PUL that encodes multiple esterases for degradation of complex arabinoxylans in Bacteroides species. The PUL is specifically upregulated in the presence of complex arabinoxylans. We characterize some of the esterases biochemically and structurally, and show that they release ferulic acid from complex arabinoxylans. Growth of four different colonic Bacteroidetes members, including Bacteroides intestinalis, on complex arabinoxylans results in accumulation of ferulic acid, a compound known to have antioxidative and immunomodulatory properties.

journal_name

Nat Commun

journal_title

Nature communications

authors

Pereira GV,Abdel-Hamid AM,Dutta S,D'Alessandro-Gabazza CN,Wefers D,Farris JA,Bajaj S,Wawrzak Z,Atomi H,Mackie RI,Gabazza EC,Shukla D,Koropatkin NM,Cann I

doi

10.1038/s41467-020-20737-5

subject

Has Abstract

pub_date

2021-01-19 00:00:00

pages

459

issue

1

issn

2041-1723

pii

10.1038/s41467-020-20737-5

journal_volume

12

pub_type

杂志文章

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