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Lecture 16

BIOL 1000 Lecture 16: Lecture 16

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Biological Sciences
BIOL 1000
Kevin G.Scott

OS82 The steroid cholesterol helps stabilize the membrane at warm temperatures & helps it stay fluid at  lower temperatures (in animal cell membranes) Mosaic refers to diverse proteins that are embedded in the fluid framework Also refers to varied function of the proteins 6 major functions performed by cellular membrane proteins 1. Help maintain cell shape & coordinate changes inside/outside cell through their attachment to the cytoskeleton & extracellular matrix (ECM) 2. Signal transduction Act as recetors for chemical messengers “signaling molecules” from  other cells  Binding of a signaling molecule triggers a change in the protein, relaying the message into the cell, activating molecules that perform specific functions = transduction 3. Enzyme activity  Some membrane proteins are enzymes  Maybe grouped in a membrane to carry out steps of a metabolic pathway o 4. Cell-  cell recognition  Membrane glycoproteins have attached crbohydrates that function as identification tags that are recognized by membrane proteins of other cells Recognition allows cells in an embryo to sort into tissues, enables cells of immune  system to recognize & reject foreign cells 5. Intercellular junctions Mebraneproteinsformintercellularjunctions frommembraneofonecell to membrane of neighboring cell 6. Transport of substances across
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