MIMG 101 Lecture Notes - Lecture 23: Aliivibrio Fischeri, Quorum Sensing, List Of The Underland Chronicles Characters

• 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

Similar bacteria can team up and work together as a group -> competitive advantage. Absent in some bacteria, required in others for cell-cell signaling. Chemical signals (autoinducers: ahl (lactone) class of quorum signals (gram -, many diff types of ahl signals -> communication with/between different species, diffuses in and out of cells, peptide class of quorum signals (gram +) Quorum = min # of members needed to make action valid. Cells can detect how many other similar cells are present. Found in symbiotic and parasitic relationships with host i. e. biofilm formation controlled by microbial population. Found in symbiotic and parasitic relationships with host i. e. biofilm formation controlled by microbial population i. e. vibrio fischeri produce light. Quorum sensing in many gram negative bacteria w/ lux alternatives: all lactone based signals i. e. spore formation as peptide signaling. Also used within cells to control cell differentiation vibrio fischeri light production is cell density dependent/requires quorum.