Incorporation of C14 from amino acids and peptides into protein by Clostridium perfringens type D.

Hauschild, Andreas H. W. (University of Toronto, Toronto, Ontario, Canada). Incorporation of C(14) from amino acids and peptides into protein by Clostridium perfringens type D. J. Bacteriol. 90:1569-1574. 1965.-Uptake of C(14) from C(14)-labeled amino acids and peptides by Clostridium perfringens was measured in culture media containing acid or papain hydrolysates of C(14)-labeled Chlorella protein. Between 2 and 4 hr of growth, the rate of C(14) uptake from peptides was higher than from free amino acids. Peptides extracted from cells with hot ethyl alcohol contained six to nine times more C(14) after 4 hr of growth with C(14)-labeled peptides than with C(14)-labeled amino acids. Incorporation of C(14)-labeled glycine, serine, threonine, alanine, and proline into both cellular and exocellular protein was two to five times higher when these were supplied as components of dialyzable peptides rather than as free amino acids.