BIOL 3150 Lecture Notes - Lecture 16: Periplasm, Phospholipid, Peptidoglycan
Document Summary
Core polysaccharide (r polysaccharide: attached to only one of those glucosamines, not to both, includes heptose, ketodeoxyoctonate acid (kdo), glucose, galactose and n- acetyl glucosamine, kdo unique to gram negative (not found in gram positive) O-polysaccharide: directly attached to the core polysaccharide, repeating sequences of oligosaccharide subunits. How many of these groups you end up with varies considerably and depends on the species. Typically get 3-5 of these chains: biggest variation between strains of gram negative is in how many of the groups you have in this o region and the actual types of sugars can vary. So both number and types can vary: helps to distinguish between different types of bacteria (i. e. salmonella vs. e coli, function: contributes to virulence of gram-negative stains because when removed loose virulence ability of that specific bacteria. Helps bacteria infect an organism: chains may be branched. Pores allow things to pass into that periplasmic space.
