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Murein, also known as mucopeptide, peptidoglycan orViscous complex(mucocomplex): When bacteriacell surfaceIt is believed that there are several polymer layers, and the reason why bacterial cells can withstand strong osmotic pressure and maintain their unique shape is that there is a layer called cell wall or cell sacculus surrounding the cells.
Murein, also known as mucopeptide, peptidoglycan orViscous complex（mucocomplex）：
Parietal cytoplasm
In bacteriacell surfaceIt is believed that there are several polymer layers, and the reason why bacterial cells can withstand strong osmotic pressure and maintain their unique shape is that there is a layer called cell wall or cell sacculus surrounding the cells.This layer is a pocket shaped giant molecular structure called cytoplasm.Although there are slight structural differences in almost all bacteria, the cytoplasm basically has a very similar structure.Peptide glycan units are mostly arranged by the bridging structure connecting their peptide chains, and then combine with phosphoteichoic acid through the cell wall acid residues to form a huge three-dimensional structure.The bridging of this peptide can vary depending on the type of bacteria.It is known that when bacteria divide, the highly controlled part of the cytoplasm, namely, the three-dimensional spatial structural unit, will undergo repeated decomposition and biosynthesis, and biosynthesis includesUridine diphosphateN-acetyl muramyl peptide units on UDP are transferred to cell membrane componentsBacterial terpene alcoholThe process at the end of the peptide chaind-alanine Biosynthesis ends at the stage when (alanine) residues form a bridge.The transpeptidase catalyzing this final stage can be strongly blocked by penicillin, which is the reason for the antibacterial effect of penicillin.
