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Part 2 Structure and Catalysis

Chapter 7 The Three-Dimensional Structure of Proteins

  • Overview of Protein Structure
  • There Are Four Levels of Architecture in Proteins
  • A Protein's Conformation Is Stabilized Largely by Weak Interactions
  • Protein Secondary Structure
  • The Peptide Bond Is Rigid and Planar
  • The a Helix Is a Common Protein Secondary Structure
  • BOX 7-1 Knowing the Right Hand from the Left
  • Amino Acid Sequence Affects a Helix Stability
  • The ß Conformation Organizes Polypeptide Chains into Sheets
  • Other Secondary Structures Occur in Some Proteins
  • Secondary Structure Is Affected by Several Factors
  • Fibrous Proteins Are Adapted for a Structural Function
  • BOX 7-2 Permanent Waving Is Biochemical Engineering
  • Protein Tertiary Structure
  • X-Ray Analysis of Myoglobin R.evealed Its Tertiary Structure
  • X-Ray Diffraction
  • Proteins Differ in Tertiary Structure
  • Proteins Lose Structure and Function on Denaturation
  • Amino Acid Sequence Determines Tertiary Structure
  • Tertiary Structures Are Not Rigid
  • Polypeptides Fold Rapidly by a Stepwise Process
  • There Are a Few Common Tertiary Structural Patterns
  • Protein Quaternary Structure
  • X-Ray Analysis Revealed the Complete Structure of Hemoglobin
  • Conformational Changes in Hemoglobin Alter Its Oxygen-Binding Capacity
  • Hemoglobin Binds Oxygen in the Lungs and Releases It in Peripheral Tissues
  • There Are Limits to the Size of Proteins
  • Some Proteins Form Supramolecular Complexes
  • Summary
  • Further Reading
  • Problems

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