Murein(peptidoglycan)is a polymer with a backbone of 1-4 and N-acetyl 2.7,the lactyl group of which is cross-linked through tetrapeptide 2.8 some gram-positive bacteria,including lacto,are resistant to lysozyme since they have murei o-axe at the 6-oh of N.
D-gluta and D-ala occupy the 2nd and 4th positions of the tetrapeptide in most cases,and L-ser or glycine the 1st position depending on the species. Various amino acids are found in the 3rd position including L-orni,L-ly,L,L-dia,meso-dia and rarely L-homo. The 3rd amino acids in the murein tetrapeptide is a key criterion used for bacterial classification. The degree of cross-linking differs depending on the species,and is low at the growing tip of a single bacterial cell. Murein with reduced cross-linking is more susceptible to hydrolyzing enzymes.
gram-positive bacteria do not have an outer membrane but have a much thicker cell wall containing teichoic acid,lipoteichoic acid and lipoglycan in addition to murein.
Murein(peptidoglycan)is a polymer with a backbone of 1-4 and N-acetyl 2.7,the lactyl group of which is cross-linked through tetrapeptide 2.8 some gram-positive bacteria,including lacto,are resistant to lysozyme since they have murei o-axe at the 6-oh of N.
D-gluta and D-ala occupy the 2nd and 4th positions of the tetrapeptide in most cases,and L-ser or glycine the 1st position depending on the species. Various amino acids are found in the 3rd position including L-orni,L-ly,L,L-dia,meso-dia and rarely L-homo. The 3rd amino acids in the murein tetrapeptide is a key criterion used for bacterial classification. The degree of cross-linking differs depending on the species,and is low at the growing tip of a single bacterial cell. Murein with reduced cross-linking is more susceptible to hydrolyzing enzymes.
gram-positive bacteria do not have an outer membrane but have a much thicker cell wall containing teichoic acid,lipoteichoic acid and lipoglycan in addition to murein.
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