Patterns of peptide metabolism by rumen microorganisms

R. J. Wallace, C. J. Newbold, N. McKain

Research output: Chapter in Book/Report/Conference proceedingChapter


Some fundamental microbiology and biochemistry of peptide breakdown in the rumen is described. Peptides are extensively broken down in the rumen and only small quantities of peptide-N were found in rumen fluid from sheep 7 h after feeding. The main determinant affecting the rate of hydrolysis of different peptides added to rumen fluid in vitro was the structure of the N-terminus of the peptide chain. Neutral and basic peptides also tended to be hydrolysed more rapidly than acidic peptides. Peptide hydrolysis was carried out mainly by rumen bacteria, apparently by a dipeptidyl peptidase type I (DP-1) mechanism. Bacteroides ruminicola was the only rumen bacterial species found to possess significant DP-1 activity.
Original languageEnglish
Title of host publicationThe Rumen Ecosystem
Subtitle of host publicationThe Microbial Metabolism and its Regulation
EditorsS. Hoshino, R. Onodera, H. Minato, H. Itabashi
Place of PublicationTokyo
PublisherJapanese Scientific Societies Press-Springer Verlag
Number of pages8
ISBN (Print)978-0387531335
Publication statusPublished - 1990

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