Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Adrenergic Receptors: β Subtype01:26

Adrenergic Receptors: β Subtype

3.1K
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...
3.1K
Adrenergic Receptors (Adrenoceptors): Classification01:27

Adrenergic Receptors (Adrenoceptors): Classification

4.2K
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,...
4.2K
Adrenergic Receptors: ɑ Subtype01:31

Adrenergic Receptors: ɑ Subtype

2.5K
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...
2.5K
Sympathetic Signaling01:31

Sympathetic Signaling

1.9K
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...
1.9K
Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

3.7K
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...
3.7K
Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers01:25

Adrenergic Antagonists: Chemistry and Classification of β-Receptor Blockers

1.1K
β-adrenergic antagonists, or β-blockers, modulate the sympathetic nervous system by targeting β-adrenoceptors and inhibiting catecholamine-mediated sympathetic responses. β-blockers differ in their adrenoceptor subtype affinity, lipophilicity, and α-blocking capabilities. The history of β-blocker development began with the prototype, dichloroisoprenaline, which exhibited partial agonist activity. As a result, propranolol was developed as a pure antagonist but...
1.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A Selectfluor-based Polonovski Rearrangement Leading to Novel Entities for Synthetic and Medicinal Applications.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same author

Neurotensin receptor 2 agonism attenuates adverse cardiac remodeling in preclinical models.

Science translational medicine·2026
Same author

Structurally defining neurokinin selectivity to improve NK2R agonists.

Nature structural & molecular biology·2026
Same author

Toward a Random Background for Ligand Optimization.

bioRxiv : the preprint server for biology·2026
Same author

A negative survival pressure selection system enables GPCR antagonist screening.

Cell discovery·2026
Same author

Single-molecule localization and diffusivity microscopy reveals dynamic biomolecular organization in living cells.

Nature methods·2026

Related Experiment Video

Updated: Dec 4, 2025

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
07:16

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission

Published on: August 16, 2018

13.9K

Binding pathway determines norepinephrine selectivity for the human β1AR over β2AR.

Xinyu Xu1,2, Jonas Kaindl3, Mary J Clark4

  • 1Beijing Advanced Innovation Center for Structural Biology, Tsinghua University, Beijing, 100084, China.

Cell Research
|October 23, 2020
PubMed
Summary
This summary is machine-generated.

Structural differences in the extracellular vestibule of beta-1 adrenergic receptors (β1AR) explain norepinephrine

More Related Videos

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
12:03

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors

Published on: June 7, 2016

18.3K
Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
08:21

Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery

Published on: June 28, 2019

7.2K

Related Experiment Videos

Last Updated: Dec 4, 2025

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
07:16

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission

Published on: August 16, 2018

13.9K
Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
12:03

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors

Published on: June 7, 2016

18.3K
Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
08:21

Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery

Published on: June 28, 2019

7.2K

Area of Science:

  • Pharmacology
  • Structural Biology
  • Biochemistry

Background:

  • Beta adrenergic receptors (βARs) are key mediators of sympathetic nervous system responses.
  • Norepinephrine exhibits higher affinity for β1AR compared to epinephrine, a critical physiological distinction.
  • Understanding βAR selectivity is crucial for developing targeted therapeutics.

Purpose of the Study:

  • To elucidate the structural basis for norepinephrine's selectivity towards the β1AR over the β2AR.
  • To investigate the role of extracellular vestibule differences in catecholamine binding.
  • To provide insights into the molecular mechanisms governing βAR agonist binding and affinity.

Main Methods:

  • X-ray crystallography was employed to determine the structures of human β1AR bound to carazolol and various agonists (norepinephrine, epinephrine, BI-167107).
  • Comparative structural analysis of β1AR and β2AR was performed.
  • Metadynamics simulations and mutagenesis studies were utilized to probe ligand-receptor interactions and dynamics.

Main Results:

  • The orthosteric catecholamine-binding pockets of β1AR and β2AR are structurally conserved.
  • Significant differences in the shape and electrostatic properties of the extracellular vestibules between β1AR and β2AR were identified.
  • These vestibule differences were shown to influence norepinephrine's access pathway and contribute to differential association rates and affinities.

Conclusions:

  • Extracellular vestibule variations, not the orthosteric pocket, underlie the selectivity of norepinephrine for β1AR.
  • Ligand access pathways and association kinetics, modulated by vestibule properties, are critical determinants of βAR agonist affinity.
  • These findings offer a structural framework for understanding βAR signaling and designing selective adrenergic drugs.