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The NH(2)-terminal amino acid distribution of Streptococcus faecalis R soluble and ribosomal proteins isolated from cells at different stages of growth on either folate-sufficient or folate-deficient medium was determined by the dinitrophenyl method. The NH(2)-terminal residues do not follow the random distribution observed for the total amino acid composition of S. faecalis soluble and ribosomal proteins. Methionine and alanine occur most frequently; serine, threonine, aspartic and glutamic acids, and glycine are also present at the NH(2)-terminal position of S. faecalis R proteins. The absence of folic acid yields cells that are incapable of formylating methionyl-transfer ribonucelic acid tRNA(f) (Met), but does not affect either the qualitative or quantitative NH(2)-terminal distribution of total soluble or total ribosomal proteins compared to cells grown with folate. A small quantitative difference was observed in the frequency of distribution of certain amino acids at the NH(2)-termini between log and stationary phase soluble proteins. The amino acid residues found at the NH(2)-terminal position of S. faecalis proteins are qualitatively similar to those reported for several other organisms.

NH2-Terminal Amino Acid Distribution and Amino Acid Composition ofStreptococcus faecalisR Soluble and Ribosomal Proteins

NH₂-Terminal Amino Acid Distribution and Amino Acid Composition ofStreptococcus faecalisR Soluble and Ribosomal Proteins