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Chapter 3 Proteins
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Purpose Mostly for structure: skin, muscle, fingernails, hair
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What is the “R” group? Variable part of the amino acid Amino Acid Chart (handout)Amino Acid Chart
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Forming/Breaking Peptide Bonds
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Type of Proteins 8. Receptor Proteins Intercellular communication Bind to specific proteins (like hormones) Receptor Proteins
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Note the H-bonds (between -O of carbonyl and -H of amino): coiling and pleating
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Tertiary Folding: disulfide bridges Disulfide bridges formed between cysteine amino acids (Look at cysteine’s structure)
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Disulfide Bridges Formed when cysteine’s sulfur join You Tube Videos Disulfide Bonds
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Use the Amino Acid Reference Sheet Select the type of tertiary interaction as (1) disulfide(2) ionic (3) H bonds(4) hydrophobic A.Leucine and valine B.Two cysteines C.Aspartic acid and lysine D. Serine and threonine
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ANSWERS Select the type of tertiary interaction as (1) disulfide(2) ionic (3) H bonds(4) hydrophobic A.4 Leucine and valine B.1 Two cysteines C.2 Aspartic acid and lysine D. 3 Serine and threonine
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Two Basic Shapes Fibrous Strands Like hair, nails,skin, muscle fibers Globular Blobs Like hemoglobin, insulin, hormones, antibodies
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Quaternary: combination of other shapes collagen
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Identify the level of protein structure 1. Primary2. Secondary 3. Tertiary 4. Quaternary A. Beta pleated sheet B. Order of amino acids in a protein C. A protein with two or more peptide chains D. The shape of a globular protein E. Disulfide bonds between R groups
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Identify the level of protein structure 1. Primary2. Secondary 3. Tertiary 4. Quaternary ANSWERS 2 Beta pleated sheet 1 Order of amino acids in a protein 4 A protein with two or more peptide chains 3 The shape of a globular protein 3 Disulfide bonds between R groups
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Video Stuff Protein Denaturation Video (McGraw-Hill) Interactive Animations: Protein FoldingInteractive Animations Protein Structures Animation No Sound,but great molecular models
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Denaturation Disruption of secondary, tertiary and quaternary protein structure by: heat/organics (Break apart H bonds and disrupt hydrophobic attractions) acids/ bases(Break H bonds between polar R groups and ionic bonds) heavy metal ions (React with S-S bonds to form solids) agitation (Stretches chains until bonds break)
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NOTE: Denaturation does not break the primary structure Denaturation of an egg with a strong acid videoDenaturation of an egg with a strong acid video
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Protein Extra Credit OPP Can bring in up to 5 labels (no repeats) for 1 point each with a protein term circled: – protein – peptide – amino
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Proteins are Active DO PROTEIN ACTIVITY
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