1887

Abstract

-Alanyl--tyrosine and glycyl--phenylalanine labelled with C competed with each other and with the dipeptide antibiotic bacilysin for transport into NCTC 6571 in a medium which did not support growth. They also competed with other dipeptides and several tripeptides. The fast initial transport of the two labelled peptides appeared to show Michaelis–Menten kinetics. Neither was transported into a bacilysin-resistant mutant of NCTC 6571, although tyrosine was taken up by the mutant as readily as it was by the parent strain.

Uptake of alanyltyrosine or glycylphenylalanine was followed by rapid hydrolysis of the peptide and the excretion of tyrosine or phenylalanine. Glycine liberated from glycylphenylalanine was partly degraded and partly incorporated into the bacterial wall. The behaviour of these dipeptides paralleled the inactivation of bacilysin by suspensions of and the appearance of its C-terminal amino acid, anticapsin, in the extracellular fluid.

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1979-11-01
2021-07-28
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