MICR 221 Lecture Notes - Lecture 8: Cell Membrane, Phototaxis, Membrane Protein

• School: Queen's University
• Department: Microbiology and Immunology
• Course: MICR 221
• Professor: Mixed

Document Summary

Tumbling can reorient cell so that it can swim off in a different direction. Increased attractant and decreased repellent = increase in length and number of runs = run. Movement towards or away from a chemical. Other taxes include aerotaxis (air), phototaxis (light) and magnetotaxis (magnetic fields). The signal is detected by a membrane protein and delivered through a series of chemotaxis proteins to the base of the flagella. Do not have to be metabolized to be effective. Chemoreceptors in the cytoplasmic membrane respond to very low levels. An attractant/ repellent can be chemically modified so as not to be able to be metabolized. This sti(cid:373)ulated the mcp"s (cid:449)hi(cid:272)h i(cid:374) tur(cid:374) i(cid:374)du(cid:272)es ru(cid:374)(cid:374)i(cid:374)g or tu(cid:373)(cid:271)li(cid:374)g. They are the binding site for different attractants and repellents. 5 mcp"s (cid:449)ell studied (cid:894)tsr, tar, trg, tap, aer(cid:895). 2 cytoplasmic che proteins (chea and chew) . Mcp and chew work toether to regulate the activity of chea.