Hong YS, Jung DH, Chung WH, Nam YD, Kim YJ, Seo DH, Park CS. Human gut commensal bacterium
Ruminococcus species FMB-CY1 completely degrades the granules of resistant starch.
Food Sci Biotechnol 2022;
31:231-241. [PMID:
35186353 PMCID:
PMC8818079 DOI:
10.1007/s10068-021-01027-2]
[Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2021] [Revised: 12/16/2021] [Accepted: 12/19/2021] [Indexed: 01/12/2023] Open
Abstract
Resistant starch (RS) in the diet reaches the large intestine and is fermented by the gut microbiota, providing beneficial effects on human health. The human gut bacterium FMB-CY1 was isolated and identified as a new species closest to Ruminococcus bromii. Ruminococcus sp. FMB-CY1 completely degraded RS including commercial RS types 2, 3, and 4, and generated glucose and maltose; however, it did not assimilate glucose. Genome analysis revealed 15 amylolytic enzymes (Amy) present in FMB-CY1. The evolutionary trees revealed that the Amys were well divided each other. All Amys (4, 9, 10, 12, and 16) containing cohesin and/or dockerin and scaffolding proteins known to be involved in constituting the amylosome, were identified. A new species of Ruminococcus, strain FMB-CY1, was considered to have the ability to form amylosomes for the degradation of RS. This new RS-degrading Ruminococcus species provides insights into the mechanism(s) underlying RS degradation in the human gut.
SUPPLEMENTARY INFORMATION
The online version contains supplementary material available at 10.1007/s10068-021-01027-2.
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