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Sci Rep. 2016 Oct 19;6:35045. doi: 10.1038/srep35045.

A novel gene cluster allows preferential utilization of fucosylated milk oligosaccharides in Bifidobacterium longum subsp. longum SC596.

Author information

1
Department of Viticulture &Enology, University of California, One Shields Ave. Davis, CA 95616, United States.
2
Department of Foods for Health Institute and University of California, One Shields Ave. Davis, CA 95616, United States.
3
Department of Chemical and Bioprocess Engineering, School of Engineering, Pontificia Universidad Catolica de Chile, Av. Vicuña Mackenna 4860, Santiago, Chile.
4
Department of Chemistry, University of California, One Shields Ave. Davis, CA 95616, United States.
5
Genome Center, University of California, One Shields Ave. Davis, CA 95616, United States.
6
Centro de Genetica y Genomica, Facultad de Medicina, Clinica Alemana, Universidad del Desarrollo, Santiago, Chile.
7
Department of Food Science &Technology, University of California, One Shields Ave. Davis, CA 95616, United States.

Abstract

The infant intestinal microbiota is often colonized by two subspecies of Bifidobacterium longum: subsp. infantis (B. infantis) and subsp. longum (B. longum). Competitive growth of B. infantis in the neonate intestine has been linked to the utilization of human milk oligosaccharides (HMO). However, little is known how B. longum consumes HMO. In this study, infant-borne B. longum strains exhibited varying HMO growth phenotypes. While all strains efficiently utilized lacto-N-tetraose, certain strains additionally metabolized fucosylated HMO. B. longum SC596 grew vigorously on HMO, and glycoprofiling revealed a preference for consumption of fucosylated HMO. Transcriptomes of SC596 during early-stage growth on HMO were more similar to growth on fucosyllactose, transiting later to a pattern similar to growth on neutral HMO. B. longum SC596 contains a novel gene cluster devoted to the utilization of fucosylated HMO, including genes for import of fucosylated molecules, fucose metabolism and two α-fucosidases. This cluster showed a modular induction during early growth on HMO and fucosyllactose. This work clarifies the genomic and physiological variation of infant-borne B. longum to HMO consumption, which resembles B. infantis. The capability to preferentially consume fucosylated HMO suggests a competitive advantage for these unique B. longum strains in the breast-fed infant gut.

PMID:
27756904
PMCID:
PMC5069460
DOI:
10.1038/srep35045
[Indexed for MEDLINE]
Free PMC Article

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