1uj3

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spinqualitylabelsall models PDB ID 1uj3 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
, resolution 2.10Å
Coordinates:	save as pdb, mmCIF, xml

Crystal structure of a humanized Fab fragment of anti-tissue-factor antibody in complex with tissue factor

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

Tissue factor (TF) is a membrane-anchored protein that initiates the extrinsic cascade of blood coagulation. TF forms a complex with serine protease Factor VIIa, and then activates Factor X zymogen to Factor Xa, leading to the blood coagulation. Humanized anti-TF antibody hATR-5 strongly inhibits TF-initiated blood coagulation, and is of potential use for various thrombotic diseases. The Fab fragment of antibody hATR-5 is obtained for crystallization. The crystal structure of the complex of the Fab with extracellular domains of human TF was determined with the molecular replacement method, and refined to an R factor of 0.196 at 2.1 A resolution. All the complementarity-determining regions (CDRs) of the Fab are involved in interaction with the C-terminal-side extracellular domain of TF through 19 hydrogen bonds. The interface between the Fab and TF molecules contains 15 water molecules, and yields buried surface areas as wide as 2000 A2. The TF surface in the interface is possibly involved in the activation of Factor X, by forming a transient ternary complex of Factor X-TF-Factor VIIa. Electrostatic interactions are predominantly observed between the heavy-chain CDRs and TF. These hydrogen-bonding and electrostatic interactions together with the wide buried areas contribute to the high affinity of the antibody toward TF, leading to the effective inhibition of the TF-initiated blood coagulation.

Disease

Known disease associated with this structure: Esophageal squamous cell carcinoma OMIM:[606551]

About this Structure

1UJ3 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of a humanized Fab fragment of anti-tissue-factor antibody in complex with tissue factor., Ohto U, Mizutani R, Nakamura M, Adachi H, Satow Y, J Synchrotron Radiat. 2004 Jan 1;11(Pt 1):105-8. Epub 2003 Nov 28. PMID:14646147

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