20 Questions
What is the main function of aquaporins in the cell membrane?
Passage of water
Which type of membrane proteins span the complete depth of the membrane?
Integral membrane proteins
What is the role of GPCRs in membrane proteins?
Transduce extracellular signals to the intracellular environment
In which type of proteins are beta barrels made of folded beta sheets commonly seen?
Integral membrane proteins
What is the function of MHC complexes in membrane proteins?
Expression of cell identity
What type of proteins can associate with other membrane proteins but are considered soluble?
Soluble proteins
How do peripheral membrane proteins interact with the lipid bilayer?
Associate a part of themselves with a single leaflet
What is the key role of transporters among membrane proteins?
Transport of nutrients
What is the main function of tetraspanins in membrane proteins?
Connection with other cells or extracellular matrix
What distinguishes soluble proteins that associate with other membrane proteins at the membrane?
They can associate with other membrane proteins
What are the two types of lipid anchoring mentioned in the text?
Fatty acid tail and GPI anchor
Why is lipid anchoring important?
To attach specific parts of membrane proteins to the membrane and ensure proper positioning for intracellular signaling.
What is the function of GPI anchor in membrane proteins?
GPI anchor allows attachment of lipid and sugar components to the extracellular side of the membrane.
How do membrane protein associated proteins interact with membrane proteins?
Via non-covalent interactions such as ionic charges.
What is the role of lipid rafts in the cell membrane?
To allow a more directed or concentrated response to specific stimuli in certain areas of the membrane.
How does self-assembly of membrane proteins facilitate cell-cell adhesion?
By restricting the movement of proteins across the cell membrane and aiding in cell shape.
What is the significance of integral membrane proteins recognizing ligands outside the cell?
Recognition of ligands outside the cell requires enzymes to metabolize them before recognition by membrane proteins.
Why do some membrane proteins attach to the cytoskeleton?
To restrict their movement across the cell membrane and aid in shaping the cell.
How do membrane proteins and soluble proteins help organize each other?
By interacting via non-covalent interactions like ionic charges.
What is the main function of membrane protein associated proteins?
To interact with other membrane proteins and participate in signaling pathways.
Explore the diverse functions of membrane proteins such as controlling what enters and exits a cell, transporting nutrients, passing water, selective molecule transport, cell identity expression, and connecting with other cells. Learn about different types of membrane proteins and their roles.
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