Catabolite repression and feedback inhibition of protease in Streptococcus faecalis var. liquefaciens

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Abstract
Five amino acids, isoleucine, leucine, phenylalanine, tryptophan, and valine, specifically and individually repressed the formation of the extracellular protease of Streptococcus faecalis var. liquefaciens. Neither the protease itself, nor the synthesis of β-galactosidase, nor the growth of the organism was affected adversely by the presence of these amino acids. Several di- and tri-peptides containing these inhibitory amino acids also specifically repressed proteinase biosynthesis.Proline is involved in the feedback inhibition of the protease.

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