Uptake and Incorporation of Amino Acids and Peptides by Bacteroides amylophilus

AUTOR(ES)

Hullah, W. A.

RESUMO

Bacteroides amylophilus H-18 demonstrated a higher growth yield, a slightly higher growth rate, and a diminished lag period when Tryptose was added to the basal medium. This uptake of labeled amino acids was concentration-dependent, as the contribution of exogenous amino acid to the cell protein increased from 15.4 to 24.1% when the concentration of Casamino Acids in the medium was increased from 1.4 to 2.8 mg/ml. There was considerable redistribution of 14C-label to other amino acids. Tryptic peptides of casein competed effectively with the amino acids for uptake. The 14C-label from a protein was incorporated into B. amylophilus H-18 cells presumably after breakdown of the protein by the B. amylophilus H-18 protease.

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