DPT - Bacterial cell structure

Microbiology

1. Bacterial Cell Structure Areesha Ahmad B.Sc (H), M.Sc , M.Phil Ph.D scholar (Microbiology)

2. The Bacteria Bacterial Cell Structure

3. Peptidoglycan functions

4. Teichoic acids Teichoic acids are polymers of polyribitol phosphate or polyglycerol phosphate containing ribitol and glycerol . Teichoic acids are connected to either peptidoglycan or to Plasma membrane. Absent in gram negative bacteria Teichoic acids are of two types — W all teichoic acid (WTA ) lipoteichoic acids (LTA). They are connected to the peptidoglycan by a covalent bond with the six hydroxyl of N- acetylmuramic acid in the WTA and to plasma membrane lipids in LTA.

5. Teichoic acids

6. Teichoic acids functions: They constitute major surface antigens of those Gram-positive species that possess them. e.g , In   Streptococcus   pneumoniae , the teichoic acids bear the antigenic determinants called Forssman antigen. They are also used as antigen for serological classification of bacteria. They bind magnesium ion and may play a role in supply of this ion to the cell. They play a role in normal functioning of the cell wall and provide an external permeability barrier to Gram-positive  bacteria. Regulate normal cell division

7. Plasma Membrane

8. Various examples of inclusion bodies are : Starch/Glycogen granules Nitrogen-reserve granules Sulphur inclusions Lipid inclusions

9. Cytoplasmic inclusion bodies

10. Thank you..