Structural basis of RGD-hirudin binding to thrombin: Tyr3 and five C-terminal residues are crucial for inhibiting thrombin activity

Hirudin is an anti-coagulation protein produced by the salivary glands of the medicinal leech Hirudomedicinalis. It is a powerful and specific thrombin inhibitor. The novel recombinant hirudin, RGD-hirudin, which contains an RGD motif, competitively inhibits the binding of fibrinogen to GPIIb/IIIa o...

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Bibliographic Details
Published in:BMC structural biology 2014-12, Vol.14 (1), p.26-26, Article 26
Main Authors: Huang, Yinong, Zhang, Yanling, Zhao, Bing, Xu, Qiping, Zhou, Xiushi, Song, Houyan, Yu, Min, Mo, Wei
Format: Article
Language:English
Subjects:
Amino acids
Analysis
Anticoagulants (Medicine)
Binding Sites
Blood coagulation factors
Catalytic Domain
Crystal structure
Fibrin
Health aspects
Hirudins - chemistry
Hirudins - genetics
Hirudins - pharmacology
Laboratories
Models, Molecular
Molecular Docking Simulation
Mutation
NMR
Nuclear magnetic resonance
Pichia - genetics
Pichia - metabolism
Point Mutation
Protein Refolding
Studies
Surface Plasmon Resonance
Thrombin - antagonists & inhibitors
Thrombin - metabolism
Tyrosine - genetics
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Summary:Hirudin is an anti-coagulation protein produced by the salivary glands of the medicinal leech Hirudomedicinalis. It is a powerful and specific thrombin inhibitor. The novel recombinant hirudin, RGD-hirudin, which contains an RGD motif, competitively inhibits the binding of fibrinogen to GPIIb/IIIa on platelets, thus inhibiting platelet aggregation while maintaining its anticoagulant activity. Recombinant RGD-hirudin and six mutant variants (Y3A, S50A, Q53A, D55A, E57A and I59A), designed based on molecular simulations, were expressed in Pichia pastoris. The proteins were refolded and purified to homogeneity as monomers by gel filtration and anion exchange chromatography. The anti-thrombin activity of the six mutants and RGD-hirudin was tested. Further, we evaluated the binding of the mutant variants and RGD-hirudin to thrombin using BIAcore surface plasmon resonance analysis (SPR). Kinetics and affinity constants showed that the KD values of all six mutant proteins were higher than that of RGD-hirudin. These findings contribute to a novel understanding of the interaction between RGD-hirudin and thrombin.
ISSN:1472-6807
1472-6807
DOI:10.1186/s12900-014-0026-9