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1-15-10ProteinStructureEnzymesJunctions

1-15-10ProteinStructureEnzymesJunctions - BIOL13100 Biology...

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BIOL13100 Biology II: Development, Structure, and Function of Organisms January 15, 2010 Dr. Nancy Pelaez Lilly G-224 [email protected]
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Table 3-1
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Amino Acids R C C O OH H 2 N H The alpha carbon
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Amino Acid in Water at pH 7 R C C O O H 2 N H The alpha carbon 3
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Figure 3-2 Non-ionized form of amino acid Ionized form of amino acid Amino group Amino group Carboxyl group Carboxyl group Side chain Side chain Non-ionized Non-ionized Ionized Ionized
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Figure 3-3 Nonpolar side chains Polar side chains Electrically charged side chains Glycine (G) Gly Alanine (A) Ala Valine (V) Val Leucine (L) Leu Isoleucine (I) Ile Methionine (M) Met Phenylalanine (F) Phe Tryptophan (W) Trp Proline (P) Pro Serine (S) Ser Threonine (T) Thr Cysteine (C) Cys Tyrosine (Y) Tyr Asparagine (N) Asn Glutamine (Q) Gln Acidic Basic Aspartate (D) Asp Glutamate (E) Glu Lysine (K) Lys Arginine (R) Arg Histidine (H) His No charged or electronegative atoms to form hydrogen bonds; not soluble in water Charged side chains form hydrogen bonds; highly soluble in water Partial charges can form hydrogen bonds; soluble in water
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Figure 3-5 Polymer Polymerization (bonding together of monomers)
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Peptide Bond Formation Between Two Amino Acids R C C O OH H 2 O H 2 N H 1 R C C O OH H 2 N H 2 + R C H 2 N H 1 R C C O OH H 2 +
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A Tri-peptide in water at pH 7 Alanine Aspartic acid Valine
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Proteins are polymers of amino acids. A protein has an N-terminus and a C- terminus. N-Glu-Ala-Ile-Thr-…..Gly-Ala-Ala-Ala-Thr-Ser-C The primary structure of a protein is the sequence of the amino acids.
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Figure 3-6 (Water) (Water) Condensation reaction: monomer in, water out Hydrolysis: water in, monomer out
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Figure 3-7 Carboxyl group Amino group Peptide bond Electrons shared between carbonyl group and peptide bond offer some characteristics of double bonds
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