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. 1967 May;93(5):1499–1508. doi: 10.1128/jb.93.5.1499-1508.1967

Oligopeptide Uptake by Bacteroides ruminicola1

Kenneth A Pittman a, Sitarama Lakshmanan b, Marvin P Bryant c
PMCID: PMC276640  PMID: 5337842

Abstract

Bacteroides ruminicola did not take up 14C from exogenous 14C-labeled l-proline or 14C-labeled l-glutamic acid and took up very little 14C from exogenous 14C-labeled l-valine. Growing cultures of B. ruminicola rapidly took up 14C from 14C-proline-labeled peptides of molecular weights up to 2,000 and incorporated it into trichloroacetic acid-insoluble cell material. Uptake and incorporation did not occur at 0 C and were reduced or eliminated in glucose-starved cells, depending upon the length of time the cells were starved. The initial rate of uptake of peptides seemed to exhibit saturation kinetics, but it was impossible to establish this conclusively. The initial uptake of 14C from peptides was not affected by chloramphenicol but the incorporation of it into trichloroacetic acid-insoluble cell material was virtually eliminated. Only moderate amounts of trichloroacetic acid-extractable, labeled material were present in cells during peptide uptake, whether or not chloramphenicol was present. 14C-proline was rapidly released from labeled peptides during uptake, whether or not chloramphenicol was present. The amount of 14C fixed into trichloroacetic acid-insoluble cell material was directly related to the size of peptides originally supplied in the medium. It is concluded that B. ruminicola possesses a general system for the uptake of peptides, that peptides are rapidly hydrolyzed during or after uptake, and that oligopeptides function only to supply amino acids in a form available to the organism.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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