6GT6

Crystal structure of recombinant coagulation factor beta-XIIa

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.214 

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This is version 2.0 of the entry. See complete history. 


Literature

Crystal structures of the recombinant beta-factor XIIa protease with bound Thr-Arg and Pro-Arg substrate mimetics.

Pathak, M., Manna, R., Li, C., Kaira, B.G., Hamad, B.K., Belviso, B.D., Bonturi, C.R., Dreveny, I., Fischer, P.M., Dekker, L.V., Oliva, M.L.V., Emsley, J.

(2019) Acta Crystallogr D Struct Biol 75: 578-591

  • DOI: 10.1107/S2059798319006910
  • Primary Citation of Related Structures:  
    6QF7, 6GT6

  • PubMed Abstract: 

    • Coagulation factor XII (FXII) is a key initiator of the contact pathway, which contributes to inflammatory pathways. FXII circulates as a zymogen, which when auto-activated forms factor XIIa (FXIIa). Here, the production of the recombinant FXIIa protease domain (βFXIIa His ) with yields of ∼1-2 mg per litre of insect-cell culture is reported ...

    Coagulation factor XII (FXII) is a key initiator of the contact pathway, which contributes to inflammatory pathways. FXII circulates as a zymogen, which when auto-activated forms factor XIIa (FXIIa). Here, the production of the recombinant FXIIa protease domain (βFXIIa His ) with yields of ∼1-2 mg per litre of insect-cell culture is reported. A second construct utilized an N-terminal maltose-binding protein (MBP) fusion (MBP-βFXIIa His ). Crystal structures were determined of MBP-βFXIIa His in complex with the inhibitor D-Phe-Pro-Arg chloromethyl ketone (PPACK) and of βFXIIa His in isolation. The βFXIIa His structure revealed that the S2 and S1 pockets were occupied by Thr and Arg residues, respectively, from an adjacent molecule in the crystal. The Thr-Arg sequence mimics the P2-P1 FXIIa cleavage-site residues present in the natural substrates prekallikrein and FXII, and Pro-Arg (from PPACK) mimics the factor XI cleavage site. A comparison of the βFXIIa His structure with the available crystal structure of the zymogen-like FXII protease revealed large conformational changes centred around the S1 pocket and an alternate conformation for the 99-loop, Tyr99 and the S2 pocket. Further comparison with activated protease structures of factors IXa and Xa, which also have the Tyr99 residue, reveals that a more open form of the S2 pocket only occurs in the presence of a substrate mimetic. The FXIIa inhibitors EcTI and infestin-4 have Pro-Arg and Phe-Arg P2-P1 sequences, respectively, and the interactions that these inhibitors make with βFXIIa are also described. These structural studies of βFXIIa provide insight into substrate and inhibitor recognition and establish a scaffold for the structure-guided drug design of novel antithrombotic and anti-inflammatory agents.

    Organizational Affiliation: 

    Centre for Biomolecular Sciences, School of Pharmacy, University of Nottingham, Nottingham NG7 2RD, England.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Coagulation factor XIIA [auth B]253Homo sapiensMutation(s): 0 
Gene Names: F12
EC: 3.4.21.38
UniProt & NIH Common Fund Data Resources
Find proteins for P00748 (Homo sapiens)
Explore P00748 
Go to UniProtKB:  P00748
PHAROS:  P00748
GTEx:  ENSG00000131187
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseB [auth A]3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G62182OO
GlyCosmos:  G62182OO
GlyGen:  G62182OO
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CYS
Query on CYS
Download Ideal Coordinates CCD File 
 E [auth B]CYSTEINE
C3 H7 N O2 S
XUJNEKJLAYXESH-REOHCLBHSA-N		 Ligand Interaction
SO4
Query on SO4
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 D [auth B]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
GOL
Query on GOL
Download Ideal Coordinates CCD File 
 C [auth B]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.54 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.214 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.932α = 90
b = 106.932β = 90
c = 65.962γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
xia2data reduction
xia2data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-06-15 
  • Released Date: 2019-07-17 
    • Deposition Author(s): Pathak, M., Emsley, J.
Funding OrganizationLocationGrant Number
British Heart FoundationUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2019-07-17
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Refinement description, Structure summary