Lecture_3_Supplement-Amino_Acids

Lecture_3_Supplement-Amino_Acids - BIOMOLECULES ~ 30 of the...

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AMINO ACIDS The Building Blocks of Peptides and Proteins BIOMOLECULES ~ 30 of the > 90 naturally occurring elements are biochemically important The four most abundant are Hydrogen Oxygen Nitrogen Carbon BIOMOLECULES H, O, N and C are good because they are light they form 1, 2, 3 and 4 bonds H C H H H R C N R R R H R C N R R R C O H R C O R R R BIOMOLECULES Carbon 1/2 weight of dry cells forms single, double and triple bonds forms very stable C C bonds
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BIOMOLECULES Carbons with 4 single bonds bond angle: 109.5° free rotation Avg. length 0.154 nm (1.54 Å) BIOMOLECULES Carbons with 4 single bonds bond angle: 109.5° free rotation Avg. length 0.154 nm (1.54 Å) BIOMOLECULES Carbons with a double bond bond angle of 120° rigid avg. bond length 0.134 nm (1.34 Å) double bond BIOMOLECULES Functional groups attached to carbons affect structural parameters H-bonding reactivity solubility
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20 Standard Amino acids Referred to as ! -amino acids THE AMINO ACIDS GENERAL STRUCTURE +H 3 N C C R O - O H Amino end Carboxyl end ‘R’ group or Sidechain α -carbon GENERAL STRUCTURE +H 3 N C C R O - O H +H 3 N C C CH 2 O - O CH 2 S CH 3 H ! -carbon " -carbon # -carbon $ -sulfur % -carbon THE AMINO ACIDS 20 Standard Amino acids Referred to as ! -amino acids All are of the L stereoisomer (think “L” for ‘life’) confguration is based on that oF glyceraldehyde
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THE AMINO ACIDS L vs. D glyceraldehyde PHYSICOCHEMICAL PROPERTIES 1. polarity 2. acidity 3. basicity 4. aromaticity 5. bulk 6. conformational Fexibility 7. crosslinking ability 8. hydrogen bonding ability
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This note was uploaded on 11/28/2011 for the course CHEM 340 taught by Professor T.baird during the Fall '11 term at S.F. State.

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Lecture_3_Supplement-Amino_Acids - BIOMOLECULES ~ 30 of the...

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