BIOL 150 Lecture Notes - Lecture 24: Adherens Junction, Tight Junction, Cell Membrane
Document Summary
Biol 150 principles of molecular & cellular biology. Besides sections 10. 4 and 11. 1, please look at chapter 13, pp. For the material on chromosome structure discussed today! We finished discussing the kinds of junctions that reinforce epithelial cells. Desmosomes and adherens junctions hold cells together, but do not prevent liquid or ions from squeezing across the membranes between epithelial cells. Located next to and a little more apical than adherens junctions, the protein occludin in the plasma membrane joins the membranes of adjacent cells so closely that ions cannot pass by. The tight junction also prevent membrane proteins on the apical side from diffusing to the basal side, so the tight junction really defines the boundary between. We saw a dramatic?demonstration of how cells can be held together by desmosomes, zipped up close by adherens junctions, and then sealed shut by tight junctions (thanks, jess and karam! the apical and basal sides of the cell membrane.
