Signal Regulation and Contact Activation

Flashcards covering key vocabulary related to signal regulation, contact activation, and related biochemical processes.

Phosphorylation Cascade

A series of enzymatic reactions where each enzyme activates the next, leading to amplification of the signal.

Signal Regulation: Amplification

The process by which one initial signal can lead to the activation of multiple downstream signaling molecules.

Specificity in Signal Regulation

The ability of a signaling molecule to affect only certain cells with the appropriate receptors, as seen with Acetylcholine and Estrogen.

Termination in Signal Regulation

Processes that lead to the degradation or removal of a ligand or blocking of a receptor to stop the signaling.

Contact Activation

A process involving zymogens being activated by contact with a specific activating agent, relevant in coagulation.

Zymogen

An inactive precursor of an enzyme that requires a biochemical change to become an active enzyme.

Activated Thrombin

An enzyme that plays a critical role in the coagulation cascade by activating other zymogens.

Signal Regulation: Efficiency

The ability to fold proteins and organize interactions to enhance the efficiency of downstream signaling.

Estrogen Receptor (ER)

A cellular receptor that mediates the effects of estrogen through various intracellular signaling routes.

Intracellular Signaling Proteins

Proteins within the cell that are activated by receptors to propagate and amplify signals.

Scaffold Protein

A protein that helps organize various signaling molecules in a pathway to enhance their interactions.

Apoptosis

The programmed cell death that can be triggered as a termination response in signaling pathways.