4.4 The Structure and Functions of Membrane Proteins

Membrane proteins are categorized into integral, peripheral, and lipid-anchored types, each playing distinct roles in cellular function. Integral proteins span the lipid bilayer and function as receptors, channels, or transporters, while peripheral proteins attach via noncovalent bonds, providing structural support and participating in signaling. Lipid-anchored proteins are covalently linked to lipids within the membrane, contributing to processes like signal transduction; techniques such as freeze-fracture analysis, hydropathy plots, and site-directed mutagenesis help researchers study their structure and function.