2.2 Prokaryotic Cell Wall Cytoplasm Nucleoid Ribosomes ●0 ●●9 Cell Wall Cytoplasmic membrane
2.2 Prokaryotic Cell Wall Cell Wall
The cell wall of the bacterial cell is a complex, semi-rigid structure that is responsible for the characteristic shape of the cell.The cell wall surrounds the underlying,fragile plasma (cytoplasmic)membrane and protects it and internal parts of the cell from adverse changes in the surrounding environment. Almost all prokaryotes have cell walls
• The cell wall of the bacterial cell is a complex, semi-rigid structure that is responsible for the characteristic shape of the cell. The cell wall surrounds the underlying, fragile plasma (cytoplasmic) membrane and protects it and internal parts of the cell from adverse changes in the surrounding environment. • Almost all prokaryotes have cell walls
Schematic diagram of bacterial cell walls Gram Gram Peptidoglycan Peptidoglycan Membrane Membrane Periplasm Lipopolysaccharide and protein Bacteria can be divided into two major groups,called gram-positive and gram-negative.The original distinction between gram-positive and gram-negative was based on a special staining procedure,the Gram stain
Gram+ GramSchematic diagram of bacterial cell walls Bacteria can be divided into two major groups, called gram-positive and gram-negative. The original distinction between gram-positive and gram-negative was based on a special staining procedure, the Gram stain
Gram-positive Cell Wall The Gram-positive cell wall has a peptidoglycan layer that is relatively thick (ca.40 nm)and comprises approximately 90%of the cell wall.The cell walls of most Gram-positive eubacteria also have teichoic acids Peptidoglycan structure Teichoic acid Cell wall (peptidoglycan) Cytoplasmic membrane Teichoic acid structure
The Gram-positive cell wall has a peptidoglycan layer that is relatively thick (ca. 40 nm) and comprises approximately 90% of the cell wall. The cell walls of most Gram-positive eubacteria also have teichoic acids. Gram-positive Cell Wall
Structure of the Repeating Unit in Peptidoglycan Peptidoglycan is composed of two sugar derivatives,N- acetylglucosamine (NAG)and N-acetylmuramic acid (NAM),and a small group of amino acids consisting of L-alanine,D-alanine,D-glutamic acid,and either lysine or diaminopimelic acid (DAP). These constituents are connected to form a repeating structure,the glycan tetrapeptide amind acid side chain
Structure of the Repeating Unit in Peptidoglycan These constituents are connected to form a repeating structure, the glycan tetrapeptide. Peptidoglycan is composed of two sugar derivatives, Nacetylglucosamine (NAG) and N-acetylmuramic acid (NAM), and a small group of amino acids consisting of L-alanine, D-alanine, D-glutamic acid, and either lysine or diaminopimelic acid (DAP)