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Structural Modeling Insights into Human VKORC1 Phenotypes.

Katrin J Czogalla1, Matthias Watzka2,3, Johannes Oldenburg4,5

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|August 20, 2015
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Summary

Mutations in Vitamin K 2,3-epoxide reductase complex subunit 1 (VKORC1) cause warfarin resistance and rare bleeding disorders. Understanding VKORC1 mechanisms is key for anticoagulation therapy and treating VKCFD2.

Keywords:
VKCFD2VKORC1molecular modelingvitamin Kvitamin K 2,3-epoxidevitamin K antagonistsvitamin K epoxide reductase (VKOR)warfarin

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Area of Science:

  • Biochemistry
  • Genetics
  • Pharmacology

Background:

  • Vitamin K 2,3-epoxide reductase complex subunit 1 (VKORC1) is crucial for vitamin K-dependent protein γ-carboxylation.
  • VKORC1 activity is essential for maintaining proper blood coagulation.
  • Dysfunction in VKORC1 leads to altered responses to anticoagulant medications.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying vitamin K antagonist (VKA) resistance associated with VKORC1 mutations.
  • To explain the pathophysiology of the rare bleeding disorder VKCFD2 caused by specific VKORC1 mutations.
  • To provide a comprehensive summary of experimental and in silico findings on VKORC1 function and dysfunction.

Main Methods:

  • Literature review of published experimental data on VKORC1 mutations.
  • In silico modeling to analyze the structural and functional consequences of VKORC1 variants.
  • Analysis of patient data related to VKA dosing and bleeding phenotypes.

Main Results:

  • VKORC1 mutations predominantly result in resistance to coumarin and indandione anticoagulants (VKA).
  • Patients with VKA-resistant VKORC1 mutations require higher VKA doses for effective anticoagulation.
  • A rare autosomal-recessive bleeding disorder (VKCFD2) is caused by a specific homozygous VKORC1 mutation (Arg98Trp) and is responsive to vitamin K therapy.

Conclusions:

  • VKORC1 mutations have significant clinical implications, affecting anticoagulation therapy and causing rare bleeding disorders.
  • Understanding VKORC1 variants is vital for personalized anticoagulation strategies and managing VKCFD2.
  • Further research into VKORC1 structure-function relationships can inform the development of novel therapeutic approaches.