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Proteins. Proteins. Polymers composed of amino acids Protein = Polypeptide (polymer) Monomer = Amino acids Peptide bonds Amino acid Amine Group (NH2) Basic Carboxylic Acid Group (COOH) Acidic. Protein Functions. 4 Levels of Protein Structure. Primary level Sequence of amino acids

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Presentation Transcript
proteins1
Proteins
  • Polymers composed of amino acids
  • Protein = Polypeptide (polymer)
      • Monomer = Amino acids
  • Peptide bonds
  • Amino acid
    • Amine Group (NH2)
      • Basic
    • Carboxylic Acid Group (COOH)
      • Acidic
4 levels of protein structure
4 Levels of Protein Structure
  • Primary level
      • Sequence of amino acids
      • Polar covalent bonds link the amino acids
      • Only level that doesn’t use hydrogen bonds
  • Secondary
      • Hydrogen bonding between amino acid side groups
      • The sequence of amino acids converts into 1 of 2 forms
          • α-helix
          • β-pleated sheets
1 2 animations
1’ & 2’ Animations
  • 05_21aPrimaryStructure.swf
  • 05_21bSecondaryStructure.swf
3 4 structure
3’ & 4’ Structure
  • Tertiary
      • 3D shape of a polypeptide
      • Many types of bonds/interactions between side groups
      • Disulfide bridges are most significant here
  • Quaternary
      • 2 or more polypeptides (subunits) of a protein
      • Not found in all proteins
      • Same bonds/interactions as tertiary level
3 4 animations
3’ & 4’ Animations
  • 05_21cTertiaryStructure.swf
  • 05_21dQuaternaryStructure.swf
  • Animation-03-01.swf
protein denaturation1
Protein Denaturation
  • Denaturation
      • Protein unravels and loses its native conformation
  • Structure & Function
      • Change in the protein’s structure = loss of function
  • Denaturation occurs:
    • Organic solvent
    • Any chemical that disrupts the tertiary structure
    • Heat (excessive)
chaperonins
Chaperonins
  • Proteins that assist the proper folding of other proteins
  • Provide stable, insulated environment for polypeptide to achieve the correct conformation
protein questions
Protein Questions
  • Name all of the bonds in primary protein structure?
  • What bonds hold together secondary structure?
  • What about tertiary level? Quaternary?
  • Which level of protein structure is NOT found in all proteins?
protein questions answers
Protein Questions (Answers)
  • Name all of the bonds in primary protein structure?
    • Polar Covalent or peptide
  • What bonds hold together secondary structure?
    • Hydrogen bonds, though not really bonds
  • What about tertiary level? Quaternary?
    • Hydrogen, Disulfide bridges, Hydrophobic interactions, Ionic bonds, etc.
  • Which level of protein structure is NOT found in all proteins? Quaternary
protein questions page 2
Protein Questions (Page 2)
  • What is the name of a protein’s monomer?
  • What is the name of a protein’s polymeric form?
  • What are the 2 functional groups on an Amino Acid?
protein questions page 21
Protein Questions (Page 2)
  • What is the name of a protein’s monomer?
    • Amino Acid
  • What is the name of a protein’s polymeric form?
    • Polypeptide
  • What are the 2 functional groups on an Amino Acid?
    • Amino – (basic) & Carboxyl – (acidic)
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