5KMD

Structure of CavAb in complex with amlodipine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Structural basis for inhibition of a voltage-gated Ca(2+) channel by Ca(2+) antagonist drugs.

Tang, L.El-Din, T.M.Swanson, T.M.Pryde, D.C.Scheuer, T.Zheng, N.Catterall, W.A.

(2016) Nature 537: 117-121

  • DOI: https://doi.org/10.1038/nature19102
  • Primary Citation of Related Structures:  
    5KLB, 5KLG, 5KLS, 5KMD, 5KMF, 5KMH

  • PubMed Abstract: 

    Ca 2+ antagonist drugs are widely used in therapy of cardiovascular disorders. Three chemical classes of drugs bind to three separate, but allosterically interacting, receptor sites on Ca V 1.2 channels, the most prominent voltage-gated Ca 2+ (Ca V ) channel type in myocytes in cardiac and vascular smooth muscle. The 1,4-dihydropyridines are used primarily for treatment of hypertension and angina pectoris and are thought to act as allosteric modulators of voltage-dependent Ca 2+ channel activation, whereas phenylalkylamines and benzothiazepines are used primarily for treatment of cardiac arrhythmias and are thought to physically block the pore. The structural basis for the different binding, action, and therapeutic uses of these drugs remains unknown. Here we present crystallographic and functional analyses of drug binding to the bacterial homotetrameric model Ca V channel Ca V Ab, which is inhibited by dihydropyridines and phenylalkylamines with nanomolar affinity in a state-dependent manner. The binding site for amlodipine and other dihydropyridines is located on the external, lipid-facing surface of the pore module, positioned at the interface of two subunits. Dihydropyridine binding allosterically induces an asymmetric conformation of the selectivity filter, in which partially dehydrated Ca 2+ interacts directly with one subunit and blocks the pore. In contrast, the phenylalkylamine Br-verapamil binds in the central cavity of the pore on the intracellular side of the selectivity filter, physically blocking the ion-conducting pathway. Structure-based mutations of key amino-acid residues confirm drug binding at both sites. Our results define the structural basis for binding of dihydropyridines and phenylalkylamines at their distinct receptor sites on Ca V channels and offer key insights into their fundamental mechanisms of action and differential therapeutic uses in cardiovascular diseases.


  • Organizational Affiliation

    Department of Pharmacology, University of Washington, Seattle, Washington 98195-7280, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ion transport protein
A, B, C, D
285Aliarcobacter butzleri RM4018Mutation(s): 0 
Gene Names: Abu_1752
Membrane Entity: Yes 
UniProt
Find proteins for A8EVM5 (Aliarcobacter butzleri (strain RM4018))
Explore A8EVM5 
Go to UniProtKB:  A8EVM5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA8EVM5
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MC3
Query on MC3

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
H [auth A]
I [auth A]
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth B],
M [auth B],
N [auth B],
P [auth C],
Q [auth C],
T [auth D],
U [auth D]
1,2-DIMYRISTOYL-RAC-GLYCERO-3-PHOSPHOCHOLINE
C36 H72 N O8 P
CITHEXJVPOWHKC-UUWRZZSWSA-N
6UB
Query on 6UB

Download Ideal Coordinates CCD File 
R [auth C]amlodipine
C20 H25 Cl N2 O5
HTIQEAQVCYTUBX-KRWDZBQOSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
O [auth C],
S [auth D]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.235 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.64α = 90
b = 125.53β = 90
c = 191.7γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesR01HL112808
National Research Service AwardUnited StatesT32GM008268

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-31
    Type: Initial release
  • Version 1.1: 2016-09-07
    Changes: Database references
  • Version 1.2: 2016-09-14
    Changes: Database references
  • Version 1.3: 2017-09-06
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.4: 2019-12-04
    Changes: Author supporting evidence
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Experimental preparation, Refinement description