MIMG 101 Study Guide - Midterm Guide: Cell Envelope, Lipid Bilayer, Bacillus Subtilis

• School: UCLA
• Department: Microbiology, Immunology, and Molecular Genetics
• Course: MIMG 101
• Professor: G U N S A L U S& B R A D L E Y

Document Summary

Peptidoglycan (thin) 1 layer: dap, directly linked. Periplasm (space) i. e. e coli gram positive. Cell envelope: teichoic acids vertically crosslink to peptidoglycan layers. Peptidoglycan (thick: protects from swelling up, many layers (up to 50) = stronger = withstand more pressure. Cyto membrane i. e. b. subtilis bacteria cyto membrane. Lipid bilayer: hydrophilic side chains different in gram +/, fatty acid chain length varies, high temps -> longer chain -> more fluidity. Specialized proteins for cell motility, atp, cell envelope biosynthesis, intake and output. Embeds motors (mot, ms and c rings) for cell motility peptidoglycan. Aa chains cross link sugar backbone strands. Pentaglycine cross link: connected to l-lysine and d-alanine. Direct cross link (shorter: l-dap connected to d-alanine, lpp in outer membrane also connects to dap. Ribose and glycerol sugars w/ aa attached. Can be membrane linked (to peptidoglycan aa chains) Lpp selective permeability: anchors outer membrane to peptidoglycan layer, most abundant protein. Lps: decreases envelope permeability to some molecules, water rich.