MBB 222 Study Guide - Final Guide: Catabolite Activator Protein, Allolactose, Glycosidic Bond

• School: Simon Fraser University
• Department: Molec Biol & Biochem
• Course: MBB 222
• Professor: Edgar Young

Document Summary

Molecule in which a sugar is bound to another functional group via a glycosidic bond. A glycoside is a complicated molecule that contains a sugar within it. Galactose and glucose are products of lactose through hydrolysis. Can also be broken down into glucose to be used for energy. Gene transcribed to break down arabinose is absent when glucose levels are high. Process of changing one structure to another structure with the same formula. Mechanism for glycosidic bond formation during polysaccharide synthesis. Lactose undergoes isomerization (or transglycosylation) by the beta- galactosidase enzyme to make allolactose. When lactose is high, it becomes metabolized making allolactose levels high as well. The allolactose inducer molecule binds to the lac repressor which then shuts off the function of the lac repressor. As a result the gene expression for lac genes increases. Type of molecule: glucose molecule with a glycosidic bond to a sulfur. Inducer that binds lac repressor and disrupts its dna binding.