Membrane Structure/Proteins

The sections in this article are: 1 Environment 2 What do Proteins Look Like? Information Derived from Water-Soluble Proteins 2.1 Hierarchy of Structures 2.2 Subunit Molecular Weights 2.3 Conformational Flexibility 2.4 Structural Families 3 Membrane Proteins 3.1 Bacteriorhodopsin 3.2 Porin 3.3 Photosynthetic Reaction Centers 3.4 Light-Harvesting Complex 3.5 Concluding Comment 4 Speculative Structures 5 Structure-Function Relationship—Minimal Requirements 5.1 Conformational Change 5.2 Transport Pathway Across the Membrane 5.3 Absorption of Light 6 Structure-Function Relationship—Speculative Models 6.1 Voltage-Sensitive Ion Channels 6.2 Light-Driven Proton Pump 6.3 ATP-Driven Ca2+ Pump 6.4 G-Protein Coupled Receptors 7 Appendix: Methods for Structure Determination 7.1 Primary Structure 7.2 Molecular Weight 7.3 Secondary Structure 7.4 Tertiary and Quaternary Structure 7.5 X-ray Diffraction 7.6 Electron Microscopy 7.7 Nuclear Magnetic Resonance Spectroscopy 7.8 Compilations of Protein Structures