1PG7

Murine 6A6 Fab in complex with humanized anti-Tissue Factor D3H44 Fab


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural insight into how an anti-idiotypic antibody against D3H44 (anti-tissue factor antibody) restores normal coagulation.

Eigenbrot, C.Meng, Y.G.Krishnamurthy, R.Lipari, M.T.Presta, L.Devaux, B.Wong, T.Moran, P.Bullens, S.Kirchhofer, D.

(2003) J.Mol.Biol. 331: 433-446


  • PubMed Abstract: 
  • 6A6 is a murine monoclonal antibody raised against the humanized anti-tissue factor antibody D3H44. 6A6 is able to completely neutralize the anticoagulant activity of D3H44 in tissue factor-dependent functional assays, such as endotoxin-induced whole ...

    6A6 is a murine monoclonal antibody raised against the humanized anti-tissue factor antibody D3H44. 6A6 is able to completely neutralize the anticoagulant activity of D3H44 in tissue factor-dependent functional assays, such as endotoxin-induced whole blood clotting, prothrombin time, as well as factor X and factor IX activation. ELISA-type assays further showed that 6A6 binds to an epitope with critical determinants on the V(L) domain of D3H44. The possibility that the anti-idiotypic 6A6 might carry an "internal image" of the original antigen (tissue factor) was examined using the X-ray structure of the 6A6-Fab/D3H44-Fab complex determined at 2.5A resolution. We find that 6A6 structurally mimics tissue factor only so far as it combines with the antigen recognition surface of D3H44. While 6A6 contacts both V(L) and V(H) domains of D3H44, as does tissue factor, there is more contact with the D3H44 V(L) domain and less with the D3H44 V(H) domain relative to the tissue factor contacts on D3H44. Additionally, there is an almost total lack of correspondence between 6A6 and tissue factor at the level of amino acid side-chain functional groups. Despite the fact that both tissue factor and 6A6 are composed largely of beta-sheets, they present fundamentally different elements of secondary structure to D3H44; tissue factor presents beta-sheets edge-on, while 6A6 uses mostly loops. Finally, the finding that 6A6 competes with tissue factor for D3H44 binding raises the possibility of using 6A6 as an antidote for D3H44 anticoagulant therapy. To this end, we constructed a chimeric murine/human 6A6-Fab, which effectively neutralized D3H44 and fully restored tissue factor function in enzymatic assays.


    Organizational Affiliation

    Department of Protein, Genentech Inc, South San Francisco, CA 94080, USA. eigenbrot@gene.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
humanized antibody D3H44
H, I
217Homo sapiensGene Names: IGHG1
Find proteins for P01857 (Homo sapiens)
Go to UniProtKB:  P01857
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
humanized antibody D3H44
L, M
213Homo sapiensN/A
Find proteins for Q7Z3Y4 (Homo sapiens)
Go to UniProtKB:  Q7Z3Y4
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
murine antibody 6A6 Fab fragment
W, Y
210Mus musculusN/A
Find proteins for G0YP42 (Mus musculus)
Go to UniProtKB:  G0YP42
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
murine antibody 6A6 Fab fragment
X, Z
220Mus musculusGene Names: Ighg
Find proteins for P01863 (Mus musculus)
Go to UniProtKB:  P01863
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.217 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 78.890α = 77.48
b = 85.780β = 75.92
c = 92.370γ = 63.33
Software Package:
Software NamePurpose
HKL-2000data reduction
CCP4data scaling
X-PLORrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-08-26
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2014-02-05
    Type: Source and taxonomy