BIOL 3150 Lecture Notes - Lecture 12: Glycosidic Bond, Gram-Negative Bacteria, Glycan

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G and m are held together by beta 1,4 glycosidic bond: m has a series of amino acids attached: l-alanine, d-alanine, dap and d- Depending on the species of organism dap is replaced by lysine: dap and lysines only differ in their tail (dap had cooh and lysine has. Dap found in gram negative and lysine found in gram positive: a series of these repeating g, m, g, m over and over again will form one strand of peptidoglycan layer. G and m together with their amino acids= glycan tetra peptide: lysine in gram pos and dap in gram neg. Instead of cross linking to this main tetra peptide stand, end up with interbridge (yellow) which is amino acids as well. Gram negative: amino acids that come off one strand will join to those from a strand that runs parallel (where this cross linking happens).

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