2AER

Crystal Structure of Benzamidine-Factor VIIa/Soluble Tissue Factor complex.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

High Resolution Structures of p-Aminobenzamidine- and Benzamidine-VIIa/Soluble Tissue Factor: Unpredicted conformation of the 192-193 peptide bond and mapping of Ca2+, Mg2+, Na+ and Zn2+ sites in factor VIIa

Bajaj, S.P.Schmidt, A.E.Agah, S.Bajaj, M.S.Padmanabhan, K.

(2006) J.Biol.Chem. 281: 24873-24888

  • DOI: 10.1074/jbc.M509971200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Factor VIIa (FVIIa) consists of a gamma-carboxyglutamic acid (Gla) domain, two epidermal growth factor-like domains, and a protease domain. FVIIa binds seven Ca(2+) ions in the Gla, one in the EGF1, and one in the protease domain. However, blood cont ...

    Factor VIIa (FVIIa) consists of a gamma-carboxyglutamic acid (Gla) domain, two epidermal growth factor-like domains, and a protease domain. FVIIa binds seven Ca(2+) ions in the Gla, one in the EGF1, and one in the protease domain. However, blood contains both Ca(2+) and Mg(2+), and the Ca(2+) sites in FVIIa that could be specifically occupied by Mg(2+) are unknown. Furthermore, FVIIa contains a Na(+) and two Zn(2+) sites, but ligands for these cations are undefined. We obtained p-aminobenzamidine-VIIa/soluble tissue factor (sTF) crystals under conditions containing Ca(2+), Mg(2+), Na(+), and Zn(2+). The crystal diffracted to 1.8A resolution, and the final structure has an R-factor of 19.8%. In this structure, the Gla domain has four Ca(2+) and three bound Mg(2+). The EGF1 domain contains one Ca(2+) site, and the protease domain contains one Ca(2+), one Na(+), and two Zn(2+) sites. (45)Ca(2+) binding in the presence/absence of Mg(2+) to FVIIa, Gla-domainless FVIIa, and prothrombin fragment 1 supports the crystal data. Furthermore, unlike in other serine proteases, the amide N of Gly(193) in FVIIa points away from the oxyanion hole in this structure. Importantly, the oxyanion hole is also absent in the benzamidine-FVIIa/sTF structure at 1.87A resolution. However, soaking benzamidine-FVIIa/sTF crystals with d-Phe-Pro-Arg-chloromethyl ketone results in benzamidine displacement, d-Phe-Pro-Arg incorporation, and oxyanion hole formation by a flip of the 192-193 peptide bond in FVIIa. Thus, it is the substrate and not the TF binding that induces oxyanion hole formation and functional active site geometry in FVIIa. Absence of oxyanion hole is unusual and has biologic implications for FVIIa macromolecular substrate specificity and catalysis.


    Organizational Affiliation

    Protein Science Laboratory, UCLA/Orthopaedic Hospital, Department of Orthopaedic Surgery and Molecular Biology Institute, UCLA, Los Angeles, California 90095, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Coagulation factor VII
L
142Homo sapiensMutation(s): 0 
Gene Names: F7
EC: 3.4.21.21
Find proteins for P08709 (Homo sapiens)
Go to Gene View: F7
Go to UniProtKB:  P08709
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Coagulation factor VII
H
254Homo sapiensMutation(s): 0 
Gene Names: F7
EC: 3.4.21.21
Find proteins for P08709 (Homo sapiens)
Go to Gene View: F7
Go to UniProtKB:  P08709
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Tissue factor
T
206Homo sapiensMutation(s): 0 
Gene Names: F3
Find proteins for P13726 (Homo sapiens)
Go to Gene View: F3
Go to UniProtKB:  P13726
Small Molecules
Ligands 8 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

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H
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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H
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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H, T
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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H, L
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
FUC
Query on FUC

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L
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
GLC
Query on GLC

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L
ALPHA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
MG
Query on MG

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L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
BEN
Query on BEN

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H
BENZAMIDINE
C7 H8 N2
PXXJHWLDUBFPOL-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
CGU
Query on CGU
L
L-PEPTIDE LINKINGC6 H9 N O6GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.191 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 69.900α = 90.00
b = 81.200β = 90.00
c = 125.900γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
X-PLORmodel building
MOSFLMdata reduction
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-07-04
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance