9-8-08_protein_structureA

9-8-08_protein_structureA - The important thing is not to...

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The important thing is not to stop questioning. Curiosity ha structure of reality. It is enough if one tries merely to comprehe – Albert Einstein Mistakes are at the very base of human thought feeding the structure like root nodules. If we were not provided with the knack of being wrong, we could never get anything useful done.” – Lewis Thomas
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Announcements The second online quiz will become available by 10 AM after class and will be due Friday, Sept. 12, by noon.
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Sugars are linked by glycosidic bonds that can come in alpha or beta forms • Bond joining sugars together called glycosidic (–C—O—C–); • Forms by reaction between C1 of one sugar & OH of another Alpha or beta determined by conformation of C1 carbon. • Sugars can be joined by a variety of different glycosidic linkages • 2 monosaccharides covalently bond together to form disaccharide ; serve primarily as readily available energy stores, such as sucrose and lactose. • Sucrose linked by alpha bonds between the 1 and 2 carbons. Lactose linked by beta bonds between the 1 and 4 carbons
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Carbohydrate summary Monosaccharides are (CH2O) repeated 3-7 times with double bonded oxygen at end (aldose) or in middle Can form rings in α (hydroxyl on C1 below ring) or β (hydroxyl on C1 above ring) conformations Linked by glycosidic bonds to form di- or polysaccharides Glycosidic bonds can be in α or β , depending on conformation of C1 carbon The conformations of carbohydrates strongly influence their functional properties and their recognition by other molecules (e.g. glycogen, starch, cellulose).
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Lipids can be saturated or unsaturated. If unsaturated, can be cis or trans Saturated=all single carbon bonds Unsaturated, 1+ double bonds in chain. Double bonds do not rotate.
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