1HW9

COMPLEX OF THE CATALYTIC PORTION OF HUMAN HMG-COA REDUCTASE WITH SIMVASTATIN

• PDB DOI: https://doi.org/10.2210/pdb1HW9/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2001-01-09 Released: 2001-05-11 
• Deposition Author(s): Istvan, E.S., Deisenhofer, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.33 Å
• R-Value Free: 0.248 
• R-Value Work: 0.222 

Starting Model: experimental

Literature

Structural mechanism for statin inhibition of HMG-CoA reductase.

Istvan, E.S., Deisenhofer, J.

(2001) Science 292: 1160-1164

• PubMed: 11349148 
• DOI: https://doi.org/10.1126/science.1059344
• Primary Citation of Related Structures:  
  1HW8, 1HW9, 1HWI, 1HWJ, 1HWK, 1HWL


• PubMed Abstract: 
  

  HMG-CoA (3-hydroxy-3-methylglutaryl-coenzyme A) reductase (HMGR) catalyzes the committed step in cholesterol biosynthesis. Statins are HMGR inhibitors with inhibition constant values in the nanomolar range that effectively lower serum cholesterol levels and are widely prescribed in the treatment of hypercholesterolemia. We have determined structures of the catalytic portion of human HMGR complexed with six different statins. The statins occupy a portion of the binding site of HMG-CoA, thus blocking access of this substrate to the active site. Near the carboxyl terminus of HMGR, several catalytically relevant residues are disordered in the enzyme-statin complexes. If these residues were not flexible, they would sterically hinder statin binding.

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Organizational Affiliation: 

Department of Biochemistry, Howard Hughes Medical Institute, University of Texas Southwestern Medical Center at Dallas, TX 75390-9050, USA.

Biological Assembly 1  

Global Symmetry: Dihedral - D2  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 203.97 kDa 
• Atom Count: 12,185 
• Modelled Residue Count: 1,583 
• Deposited Residue Count: 1,868 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HMG-COA REDUCTASE	A, B, C, D	467	Homo sapiens	Mutation(s): 1  Gene Names: HMGCR EC: 1.1.1.34
UniProt & NIH Common Fund Data Resources
Find proteins for P04035 (Homo sapiens) Explore P04035  Go to UniProtKB:  P04035
PHAROS:  P04035 GTEx:  ENSG00000113161

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SIM	F [auth A], I [auth B], K [auth C], L [auth C]	Simvastatin acid C25 H40 O6 XWLXKKNPFMNSFA-HGQWONQESA-N
ADP	E [auth A], G [auth B], H [auth B], J [auth C], M [auth D]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
SIM	BindingDB:  1HW9	IC50: min: 4.3, max: 18 (nM) from 2 assay(s)
		EC50: 6.2 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.33 Å
• R-Value Free: 0.248 
• R-Value Work: 0.222 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.55	α = 90
b = 172.817	β = 117.56
c = 80.033	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-05-11 
Deposition Author(s): Istvan, E.S., Deisenhofer, J.

Revision History  

• Version 1.0: 2001-05-11
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2021-10-27
  Changes: Database references, Derived calculations
• Version 1.4: 2023-08-09
  Changes: Data collection, Refinement description