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D-Alanine Metabolism


The bacterial cell wall is a unique biopolymer, containing both D- and L-Amino acids. Its basic structure is a carbohydrate backbone of alternating units of N-Acetyl Glucosamine and N-Acetyl Muramic Acid. The N-Acetyl Muramic Acid residues are cross-linked with oligopeptides. The terminal peptide is D-Alanine although other amino acids are present as D- isomers and this is the only known biological molecule that contains D-Amino acids, which are responsible for the building of peptidoglycan. The cell wall of Gram-positive bac...




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