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Related Concept Videos

Dose-Response Relationship: Selectivity and Specificity01:25

Dose-Response Relationship: Selectivity and Specificity

Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and β2-adrenergic receptors...
Adrenergic Receptors: ɑ Subtype01:31

Adrenergic Receptors: ɑ Subtype

Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase C—inositol-1,4,5-trisphosphate...
Adrenergic Receptors: β Subtype01:26

Adrenergic Receptors: β Subtype

β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
Isoprenaline > Adrenaline > Noradrenaline
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
β1-adrenoceptors: β1-adrenoceptors have equal affinities for...
The Two-State Receptor Model01:29

The Two-State Receptor Model

The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with one...
Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...
Spare Receptors01:30

Spare Receptors

Some receptors remain unoccupied even when an agonist produces a maximal response. Such empty ones are called spare receptors. In presence of spare receptors the maximum effect of an agonist drug is achieved with fewer than 100% of the receptors being occupied. To determine the presence of spare receptors, scientists often compare the concentration of the drug needed to produce 50% of the maximum effect (EC50) with the concentration of the drug needed to occupy 50% of the receptors (Kd). If the...

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Closely related receptor complexes differ in their ABA selectivity and sensitivity.

Izabela Szostkiewicz1, Klaus Richter, Michal Kepka

  • 1Lehrstuhl für Botanik, Technische Universität München, Am Hochanger 4, D-85354 Freising, Germany.

The Plant Journal : for Cell and Molecular Biology
|September 23, 2009
PubMed
Summary
This summary is machine-generated.

Researchers identified RCAR3, a novel abscisic acid (ABA) receptor component. RCAR3 enhances plant sensitivity to ABA, modulating abiotic stress responses by interacting with protein phosphatases 2C (PP2C).

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Area of Science:

  • Plant Biology
  • Molecular Plant Physiology
  • Abiotic Stress Response

Background:

  • Plant hormone abscisic acid (ABA) regulates responses to abiotic stress.
  • ABA perception occurs at the plasma membrane and cytosol.
  • Cytosolic ABA receptors are complexes of protein phosphatases 2C (PP2C) and ABA-binding regulatory components (RCAR/PYR/PYL).

Purpose of the Study:

  • Characterize a novel RCAR family member, RCAR3.
  • Investigate RCAR3's interaction with PP2Cs ABI1 and ABI2.
  • Elucidate RCAR3's role in ABA signaling and plant responses.

Main Methods:

  • Screening for PP2C interactors.
  • In vitro repression assays of ABI1 and ABI2 by RCAR3.
  • ABA signaling stimulation assays in protoplast cells.
  • Biochemical characterization of RCAR3's ABA sensitivity and stereo-selectivity.

Main Results:

  • RCAR3 interacts with and represses PP2Cs ABI1 and ABI2.
  • RCAR3 stimulates ABA signaling in plant cells.
  • RCAR3 confers greater ABA sensitivity and less stringent stereo-selectivity compared to RCAR1.
  • Differential regulation of PP2C activity by RCAR1 and RCAR3.

Conclusions:

  • RCAR3 is a novel component of the ABA receptor complex.
  • Differential expression and combinatorial assembly of RCARs fine-tune ABA responses.
  • Understanding RCAR3 provides insights into plant abiotic stress tolerance mechanisms.