Dimer

Definition

A dimer is a complex formed when two molecules (often identical) bind together, typically through non-covalent interactions. In cell communication, dimers play a crucial role in signal propagation by activating receptor proteins.

5 Must Know Facts For Your Next Test

1. Dimers can form between two identical molecules (homodimers) or two different molecules (heterodimers).
2. Receptor tyrosine kinases often function as dimers to propagate signals inside the cell.
3. Dimerization can be essential for the activation of certain receptors and their subsequent signaling pathways.
4. Ligand binding to receptors often induces dimerization, which is critical for signal transduction.
5. Inhibiting dimer formation can block signal propagation and is a basis for some therapeutic interventions.

Review Questions

Related terms

Ligand: A molecule that binds specifically to another molecule, usually a larger one, such as a receptor.

Receptor Tyrosine Kinase:

A type of cell surface receptor that becomes activated through dimerization upon ligand binding.

Signal Transduction: The process by which a cellular signal is transmitted from the cell membrane to its interior through a series of molecular events.