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D-amino acids in the cell pool of bacteria

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Abstract

About 30 different bacterial species were tested for the possible presence of freed-amino acids in their cell pool. Gram-positive bacteria particularly the species of the genusBacillus have a fairly large pool of freely extractabled-amino acids. Varied quantities of freed-amino acids were detected inBacillus subtilis B3,Bacillus subtilis Marburg,Bacillus licheniformis, Bacillus brevis, Bacillus stearothermophilus, Lactobacillus fermenti, Lactobacillus delbrueckii, Staphylococcus aureus andClostridium acetobutylicum. The individual components ofd-amino acids were identified in 5Bacillus species referred to above,d-alanine is the major component; the otherd-amino acids identified are aspartic acid, glutamic acid, histidine, leucines, proline, serine and tyrosine. Thed-amino acid pool size inBacillus subtilis B3 varies with different culture conditions. The pool size is maximum when growth temperature is 30°C and it fluctuates with change in pH of the medium. The maximum quantity ofd-amino acids could be recovered when the culture was at mid log phase. O2 supply to the medium has little effect ond-amino acid pool size. The starvation of cells leads to depletion of thed-amino acid pool which is exhausted almost completely within 4 hours by incubation in nutrient-free medium.

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Bhattacharyya, S.K., Banerjee, A.B. D-amino acids in the cell pool of bacteria. Folia Microbiol 19, 43–50 (1974). https://doi.org/10.1007/BF02874501

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