TAMU BICH 410 - Amino acids (3 pages)

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Amino acids

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Amino acids


Exploring amino acids

Lecture number:
Lecture Note
Texas A&M University
Bich 410 - Comprehen Biochem I

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F BICH 410 1st Edition Lecture 4 Outline of Last Lecture Enthalpy Entropy Free Energy Outline of Current Lecture Free energy can be determined at any temp as long as the equilb constant and deltaG 0 were measured at that temp too Amino Acids and the Peptide Bond o Contains amino and carboxyl group o Alpha amino acid an amino acid AA which the amino group is attached to the carbon adjacent to the carboxyl group o All proteins are composed of 20AA o At physiological conditions amino is protonated and carboxyl deprotonated o Fully protonated is found only at low pH o AA consists of amino H carboxyl and R side chain group o Side chains determine structural and physical characteristics Nonpolar Hydrophobic polar hydrophilic o All AA are hydrophilic its their side chain that could be hydrophobic o Types of AA noncharged positive charged negative charged Margret Dayhoff pioneer of bioinformatics and created 1 letter code Non polar o Will not form H bond bc need polar bond o Want to associate with hydrophobic group o Will not participate in ionic dipole interactions o All AA chiral except Gly and Gly can also be classified as polar noncharged o Pro cyclic means 2nd amine group o Ile has 2 chiral centers o Nonpolar AA Glycine Gly G side chain H Alanine Ala A side chain CH3 Proline Pro P side chain cyclic pentagon attaching amino group with 3 CH2 These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Valine Val V side chain CH with CH3 attached in shaped of V Leucine Leu L side chain CH2 CH CH3 2 Isoleucine Ile I side chain CH with Ch3 and CH2 CH3 attached Methionine Met M side chain CH2 CH2 S CH3 o Aromatic R Groups Phenylalanine Phe F side chain CH2 benzene ring Nonpolar Tyrosine Tyr Y side chain CH2 benzene ring CH Polar noncharged Tryptophan Trp W side chain CH2 CYCLIC C double bond CH NH attached to benzene ring Nonpolar Aromaticity is used for protein detection since

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