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Related Experiment Videos

RNA aptamers specific for bovine thrombin.

Xuemei Liu1, Dajin Zhang, Guojun Cao

  • 1Beijing Institute of Basic Medical Sciences, Beijing 100850, People's Republic of China.

Journal of Molecular Recognition : JMR
|January 31, 2003
PubMed
Summary

Researchers developed RNA aptamers that specifically bind to bovine thrombin, not human thrombin. These aptamers inhibit bovine thrombin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biotechnology

Background:

  • Bovine thrombin is utilized in clinical wound healing.
  • High homology between bovine and human thrombin complicates specific targeting.
  • Antibodies often cross-react, limiting specificity.

Purpose of the Study:

  • To isolate RNA ligands (aptamers) with high specificity for bovine thrombin.
  • To develop tools that distinguish between bovine and human thrombin.
  • To create potential inhibitors for bovine thrombin activity.

Main Methods:

  • Systematic Evolution of Ligands by Exponential Enrichment (SELEX) was employed.
  • An RNA pool with a 25-nucleotide randomized region was used for selection.
  • Binding affinity (K(d)) and specificity assays were performed.

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Main Results:

  • Two RNA aptamers specific for bovine thrombin were identified with K(d) values of 164 nM and 240 nM.
  • These aptamers demonstrated no cross-reactivity with human thrombin.
  • The aptamers inhibited bovine thrombin-catalyzed fibrin clot formation in vitro.

Conclusions:

  • Isolated aptamers exhibit high specificity for bovine thrombin.
  • These aptamers may target the heparin-binding site of bovine thrombin.
  • Potential applications include clinical use and research requiring differentiation between human and bovine thrombin.