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Adrenergic Receptors (Adrenoceptors): Classification01:27

Adrenergic Receptors (Adrenoceptors): Classification

2.7K
Adrenergic receptors, or adrenoceptors, respond to the autonomic neurotransmitter noradrenaline and other endogenous catecholamine agonists. They are classified into two main families, α and β, based on their pharmacological response and are further subdivided depending on their location, elicited response, and affinity to specific agonists or antagonists.
α-Adrenoceptors
α-Adrenoceptors are classified into two main subtypes: α1 and α2. The α1 adrenoceptors,...
2.7K
Adrenergic Receptors: ɑ Subtype01:31

Adrenergic Receptors: ɑ Subtype

1.6K
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...
1.6K
Adrenergic Receptors: β Subtype01:26

Adrenergic Receptors: β Subtype

1.7K
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...
1.7K
Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

3.1K
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...
3.1K
Sympathetic Signaling01:32

Sympathetic Signaling

1.0K
Sympathetic signaling, a vital part of the autonomic nervous system, plays a crucial role in mobilizing the body's resources in response to stress or emergencies. It involves the transmission of nerve impulses from sympathetic preganglionic fibers to postganglionic fibers. This results in the release of specific neurotransmitters and activation of adrenergic receptors.
Sympathetic preganglionic fibers release the neurotransmitter acetylcholine (ACh) onto the ganglionic neurons in the...
1.0K
Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers01:17

Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers

928
Adrenergic antagonists, or sympatholytics, inhibit adrenoceptor activation driven by catecholamines or agonists. Based on their adrenoceptor specificity, adrenergic blockers can be categorized into two primary groups: α-adrenergic blockers (α-blockers) and β-adrenergic blockers (β-blockers). α-blockers interact with α1 and α2 subtypes of α-adrenoceptors.
Nonselective α-blockers: Nonselective α-blockers contain haloalkylamine or imidazoline...
928

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Related Experiment Video

Updated: Jul 23, 2025

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
10:13

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

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Structures of Adrenoceptors.

Lukas Helfinger1, Christopher G Tate2

  • 1MRC Laboratory of Molecular Biology, Cambridge, UK.

Handbook of Experimental Pharmacology
|July 17, 2023
PubMed
Summary

Structural biology has revealed 78 adrenoceptor (AR) structures, detailing ligand binding and activation mechanisms. These insights into beta- and alpha-ARs advance our understanding of receptor function and drug development.

Area of Science:

  • Structural biology
  • Biochemistry
  • Pharmacology

Background:

  • The first adrenoceptor (AR) structure, human β2-adrenoceptor (hβ2AR), was determined in 2007.
  • Since then, 78 AR structures have been elucidated using X-ray crystallography and cryo-electron microscopy (cryo-EM).
  • These structures encompass all three βAR subtypes and four αAR subtypes, providing comprehensive insights.

Purpose of the Study:

  • To provide an overview of determined adrenoceptor structures.
  • To detail receptor activation mechanisms and ligand-binding modes.
  • To compare different adrenoceptor subfamilies and identify common ligand-receptor interaction patterns.

Main Methods:

  • X-ray crystallography
  • Electron cryo-microscopy (cryo-EM)
Keywords:
Cryo-EMStructureX-ray

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  • Structural analysis of ligand-bound states (antagonist, agonist, G protein, arrestin, nanobody).

    • Main Results:

    • 78 adrenoceptor structures determined, revealing diverse conformational states.
    • Detailed molecular insights into orthosteric binding pocket interactions for 19 antagonists and 18 agonists.
    • Elucidation of binding modes for three small molecule allosteric modulators.
    • Identification of molecular determinants for receptor activation and transducer coupling.

    Conclusions:

    • Adrenoceptor structural data provides a molecular basis for understanding receptor activation and signaling.
    • Structural insights facilitate the design of novel therapeutics targeting adrenoceptors.
    • Comparative analysis reveals conserved and distinct features across adrenoceptor subfamilies.