1LQV

Crystal structure of the Endothelial protein C receptor with phospholipid in the groove in complex with Gla domain of protein C.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 

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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

The crystal structure of the endothelial protein C receptor and a bound phospholipid.

Oganesyan, V.Oganesyan, N.Terzyan, S.Qu, D.Dauter, Z.Esmon, N.L.Esmon, C.T.

(2002) J Biol Chem 277: 24851-24854

  • DOI: https://doi.org/10.1074/jbc.C200163200
  • Primary Citation of Related Structures:  
    1L8J, 1LQV

  • PubMed Abstract: 

    The endothelial cell protein C receptor (EPCR) shares approximately 20% sequence identity with the major histocompatibility complex class 1/CD1 family of molecules, accelerates the thrombin-thrombomodulin-dependent generation of activated protein C, a natural anticoagulant, binds to activated neutrophils, and can undergo translocation from the plasma membrane to the nucleus. Blocking protein C/activated protein C binding to the receptor inhibits not only protein C activation but the ability of the host to respond appropriately to bacterial challenge, exacerbating both the coagulant and inflammatory responses. To understand how EPCR accomplishes these multiple tasks, we solved the crystal structure of EPCR alone and in complex with the phospholipid binding domain of protein C. The structures were strikingly similar to CD1d. A tightly bound phospholipid resides in the groove typically involved in antigen presentation. The protein C binding site is outside this conserved groove and is distal from the membrane-spanning domain. Extraction of the lipid resulted in loss of protein C binding, which could be restored by lipid reconstitution. CD1d augments the immune response by presenting glycolipid antigens. The EPCR structure is a model for how CD1d binds lipids and further suggests additional potential functions for EPCR in immune regulation, possibly including the anti-phospholipid syndrome.


  • Organizational Affiliation

    Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endothelial protein C receptor
A, B
193Homo sapiensMutation(s): 0 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UNN8 (Homo sapiens)
Explore Q9UNN8 
Go to UniProtKB:  Q9UNN8
GTEx:  ENSG00000101000 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9UNN8
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Vitamin-K dependent protein C
C, D
33Homo sapiensMutation(s): 9 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P04070 (Homo sapiens)
Explore P04070 
Go to UniProtKB:  P04070
GTEx:  ENSG00000115718 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04070
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PTY
Query on PTY

Download Ideal Coordinates CCD File 
H [auth A],
L [auth B]
PHOSPHATIDYLETHANOLAMINE
C40 H80 N O8 P
NJGIRBISCGPRPF-KXQOOQHDSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
I [auth B]
J [auth B]
E [auth A],
F [auth A],
G [auth A],
I [auth B],
J [auth B],
K [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
M [auth C]
N [auth C]
O [auth C]
P [auth C]
Q [auth C]
M [auth C],
N [auth C],
O [auth C],
P [auth C],
Q [auth C],
R [auth C],
S [auth C],
T [auth D],
U [auth D],
V [auth D],
W [auth D],
X [auth D],
Y [auth D],
Z [auth D]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
CGU
Query on CGU
C, D
L-PEPTIDE LINKINGC6 H9 N O6GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.189 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.22α = 90
b = 62.36β = 101.81
c = 71.03γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-06-19
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2024-04-03
    Changes: Data collection, Database references, Refinement description, Structure summary