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The Requirement for the Protonated -amino Group for the Transport of Peptides in Escherichia Coli

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Journal Biochem J
Specialty Biochemistry
Date 1971 Jun 1
PMID 4942537
Citations 13
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Abstract

Many glycine peptides support growth of a glycine auxotroph of Escherichia coli. If the alpha-amino group of these peptides is methylated, the products are still utilized for growth, and also retain comparable ability with the unsubstituted peptides to compete with natural peptides for transport into the cell. In contrast, glycine peptides devoid of an alpha-amino group, or that have the alpha-amino group substituted by one of a number of acyl groups are not utilized, although E. coli possesses intracellular enzymic activity able to release glycine from such compounds; further, these derivatives do not compete with natural peptides for transport into the cell.

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