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The uptake of amino acids and peptides by Streptococcus lactis

Published online by Cambridge University Press:  01 June 2009

G. H. Rice ,
F. H. C. Stewart ,
A. J. Hillier  and
G. R. Jago
G. H. Rice
Affiliation:
Russell Grimwade School of Biochemistry, University of Melbourne, Parkville, Victoria 3052, Australia
F. H. C. Stewart
Affiliation:
Division of Protein Chemistry, CSIRO, Parkville, Victoria 3052, Australia
A. J. Hillier
Affiliation:
Dairy Research Laboratory, Division of Food Research, CSIRO, Highett, Victoria 3190, Australia
G. R. Jago
Affiliation:
Dairy Research Laboratory, Division of Food Research, CSIRO, Highett, Victoria 3190, Australia
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Summary

Peptide and amino acid transport in Streptococcus lactis was both energy-and temperature-dependent. Separate systems were present for the transport of amino acids, dipeptides and oligopeptides as well as for individual amino acids. Both tri- and tetra-peptides were readily transported while an apparent size restriction at the point of uptake resulted in a relatively low rate of uptake of the pentapeptide. The effects of pH, temperature and salt concentration on the uptake of amino acids and peptides were studied. Exchange reactions played a significant role in the uptake of both peptides and amino acids.

Type
Original Articles
Information
Journal of Dairy Research , Volume 45 , Issue 1 , February 1978 , pp. 93 - 107
Copyright
Copyright © Proprietors of Journal of Dairy Research 1978

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