Why Do Some Membrane Proteins Require Lipid Rafts to Function?

💡 The Answer

• Lipid rafts are cholesterol- and sphingolipid-rich microdomains within the plasma membrane.
• They concentrate certain membrane proteins, such as signaling receptors and GPI-anchored proteins.
• Rafts create ordered platforms that modulate protein activity and trafficking.
• Many viral entry processes, like HIV infection, depend on raft integrity.
• Disruption of rafts impairs T-cell receptor signaling.