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Vitamin K Epoxide Recycling Polypeptide VKORC1, a Therapeutic Target of Coumarin and Their Derivatives

a technology of coumarin and vkorc1, which is applied in the field of new polypeptide vitamin k epoxide recycling polypeptide, can solve the problems of coumarin activity and the molecules interacting with coumarins that are still elusive, and the risk of spontaneous bleeding is high

Inactive Publication Date: 2009-04-09
BAXTER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a vitamin K epoxide recycling polypeptide (VKORC1) and a nucleic acid coding for it. The VKORC1 polypeptide has at least one sequence abnormality that exerts an effect on its activity. The invention also provides a method of identifying a coumarin derivative that is toxicologically effective in warfarin-resistant rodents. The identified coumarin derivatives can be included into a composition for killing rodents. The technical effects of the invention include providing a tool for identifying and characterizing new VKORC1 polypeptides with improved activity and identifying new coumarin derivatives with improved toxicity for rodents.

Problems solved by technology

Moreover, the molecular nature of coumarin activity and the molecules interacting with coumarins are still elusive.
It is generally appreciated in the art that although largely effective, there are a number of limitations to the use of coumarins.
The use of coumarins is associated with a risk of spontaneous bleedings, with a significant mortality rate.
Moreover, the prediction of the accurate coumarin maintenance dose is difficult.
During the time the optimum regimen is yet not established the patient either suffers from an increased risk of thrombogenesis or of an increased risk of bleeding.
Further, establishing an optimal treatment regimen is complicated by the fact, that there is a considerable delay between the administration of coumarins and the onset of its anticoagulant activity.
Such interaction is of clinical relevance if the appropriate regimen of e.g. Phenobarbital and coumarin has been determined and later on only administration of Phenobarbital is discontinued leading to a rise of the plasma level of coumarin which causing excessive anticoagulation.
Other drugs like Amiodarone cause a delayed metabolization of coumarin leading again to excessive anticoagulation if co-administered with coumarins.
Resistance to coumarin derivatives has arisen spontaneously in several wild rodent populations rendering the use of these drugs locally ineffective for pest control.

Method used

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  • Vitamin K Epoxide Recycling Polypeptide VKORC1, a Therapeutic Target of Coumarin and Their Derivatives
  • Vitamin K Epoxide Recycling Polypeptide VKORC1, a Therapeutic Target of Coumarin and Their Derivatives
  • Vitamin K Epoxide Recycling Polypeptide VKORC1, a Therapeutic Target of Coumarin and Their Derivatives

Examples

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example 1

Characterization of the Genomic Candidate Region

[0205]The locus for combined deficiency of vitamin K-dependent clotting factor type 2 (VKCFD2) to the pericentromeric region of chromosome 16 between the markers D16S3131 and D16S419 has been mapped [Fregin et al., 2002]. This region comprises approximately 20 Mb. The genes responsible for warfarin resistance in rats (Rw) and mice (War) had been mapped to chromosome 1 [Kohn et al., 1999] and chromosome 7 [Wallace, 1976] [Greavses & Ayres, 1967] in close linkage to the myosin light chain 2 gene (Myl2). The human ortholog of Myl2, HUMMLC2B, is located on chromosome 16p11 within the VKCFD2 candidate region and is part of a conserved linkage group of genes. Based on this synteny and on biochemical considerations, it is hypothesized that VKCFD2 and warfarin resistance may be due to allelic mutations in the same gene. If so, this would narrow down the critical interval in humans to a region of approximately 4.5 Mb between the interleukin 4 r...

example 2

Mutation Screening

[0207]Using genomic DNA from two VKCFD2 and three WR subjects, a systematic mutation screen was initiated by comparative sequencing of the remaining candidate genes. Clinical data of the VKCFD2 families have been described previously [Oldenburg et al., 2000]. Warfarin resistant patients were ascertained due to their abnormal response to oral warfarin administration during thrombosis treatment or prevention. Patient C and E are sporadic cases. Patient D has two brothers also suffering from warfarin resistance. Patients C and D required approximately 150-250 mg warfarin per week to achieve a therapeutic range of oral anticoagulation whereas patient E did not show any response at all. All patients gave informed consent before participating.

[0208]Surprisingly, missense mutations were found in a gene of unknown function in all investigated VKCFD2 and WR subjects (FIG. 2). This gene (IMAGE3455200) spans a genomic region of 5126 bp and comprises three exons coding for a p...

example 3

Homology and Protein Structure

[0210]An orthologue of the VKORC1 gene was present in mouse (NM—178600) and the orthologues in rat and in Fugu rubripes were established by homology searches and RT-PCR (FIG. 3). The corresponding proteins share 79% to 84% identity with the human protein. Database searches did not show any homology to a known gene nor to any characterized protein domain. Topology prediction programs anticipated three transmembrane domains (TM). The first TM is placed between residues 10 to 29 by all programs tested. The predictions are discordant for the second and the third TM, which are located between amino acids 100 and 150. The PSORT II server predicted an ER membrane retention signal (KKXX or KXKXX) at position 159-163 of human VKORC1 with a probability of 67%[Jackson et al., 1990]. The consensus sequence was also present in the other VKORC1 proteins. This is in accordance with the likely location of the VKORC1 complex within the ER membrane system [Cain et al., 1...

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Abstract

The invention relates to a novel polypeptide vitamin K epoxide recycling polypeptide (VKORC1) as a target for coumarin and its derivatives. The invention further provides methods for identifying coumarin derivatives, and also claims VKORC1 polypeptides and VKORC1 nucleic acids containing a sequence abnormality associated with a VKORC1 associated deficiency such as warfarin resistance, wherein the VKORC1 polypeptides and VKORC1 nucleic acids can be used for diagnosing these deficiencies. Moreover, the invention relates to methods for identifying coumarin derivatives usable in pest control of rodents.

Description

FIELD OF THE INVENTION[0001]The invention relates to a novel polypeptide vitamin K epoxide recycling polypeptide (VKORC1) as a target for coumarin and its derivatives. The invention further provides methods for identifying coumarin derivatives, and also claims VKORC1 polypeptides and VKORC1 nucleic acids containing a sequence abnormality associated with aVKORC1 associated deficiency such as warfarin resistance, wherein the VKORC1 polypeptides and VKORC1 nucleic acids can be used for diagnosing these deficiencies. Moreover, the invention relates to methods for identifying coumarin derivatives usable in pest control of rodents.BACKGROUND OF THE INVENTION[0002]Repression of untimely blood coagulation is the therapeutic option of choice for acute treatment and long-term prevention of thrombolic events. Among the anti-coagulants coumarins are widely used for the prevention of thrombosis such as in patients immobilized after surgery, patients having a chronic heart failure, patients havin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01K67/00C07K14/435C07H21/04C07H21/02C12P21/06C12Q1/68C12Q1/02C07K16/00C12N15/63C12N5/00A01N43/16A61K38/44C12N5/06C12N9/02C12N9/04
CPCC12N9/0006C12Q1/6883C12Q1/26C12Q2600/16C12Q2600/136C12Q2600/156C12Q1/6876C12Q2600/158C12N15/62C12Y101/04001A01K67/0276A01K2267/01C07K16/40C12N15/1137C12N15/115C12N2310/11C12N2310/14C12N2310/16C12N2310/531
Inventor OLDENBURG, JOHANNESMULLER-REIBLE, CLEMENS R.FREGIN, ANDREASROST, SIMONESTROM, TIM-MATTHIAS
Owner BAXTER INT INC
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