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Screening method for IP3 receptor target medicine based on fluorescence polarization analysis

A technology of fluorescence polarization and screening method, which is applied in the field of screening of IP3 receptor target drugs, can solve the problems of high time and cost, and achieve the effect of accurate drug efficacy and accurate prediction

Active Publication Date: 2012-04-11
SICHUAN HUIYU PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the prediction time for a single drug takes several days, the time and cost for accurate prediction of tens of thousands of drugs are very high

Method used

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  • Screening method for IP3 receptor target medicine based on fluorescence polarization analysis
  • Screening method for IP3 receptor target medicine based on fluorescence polarization analysis
  • Screening method for IP3 receptor target medicine based on fluorescence polarization analysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 FITC-IP 3 preparation and purification of

[0024] The following reactions were set to react in NMR sample tubes so as to monitor the reaction process by nuclear magnetic resonance spectroscopy. Including the following steps: 20 μmol 2-oxo-(2-aminoethyl)-IP 3 Dissolve in 0.75 ml tetradeuteromethanol, add 50 μl triethylamine, add 30 μmol FITC solid, seal, shake well, and incubate at room temperature in the dark for 4 hours; add 20 μmol FITC solid again, and continue to incubate at room temperature in the dark for 44 hours.

[0025] After the mixture obtained in the above steps is purified, the product FITC-IP is obtained 3 .

[0026]The purification step is as follows: wash the reaction system treated in step (2) into a round bottom flask with methanol, then concentrate under reduced pressure until the substance in the round bottom flask is in the form of solid powder; add 10ml of deionized Water absorbs the solid after concentration under reduced pressur...

Embodiment 2

[0028] Example 2 IP 3 Expression and purification of the N-terminal fragment of R1

[0029] IP of this embodiment 3 The N-terminal fragment of R1 refers to the 3 Binding domain IP 3 Receptor polypeptide fragments, there are three types of receptors used in this example, which are the N-terminal fragments located at residues 1-604 (abbreviated as NT); the IP of residues 224-604 3 Binding center (abbreviated as IBC); NT mutant (abbreviated as V33k-NT), the difference between V33k-NT and NT is only that the 33-position valine is mutated into lysine.

[0030] V33k-NT nucleotides can be prepared using the QuickChange mutagenesis kit.

[0031] The nucleotide sequence prepared by cloning is confirmed by DNA sequencing before transformation and expression. All peptides prepared include an N-terminal GST tag attached via a PreScission cleavage site. The purification of GST-tagged peptides can be performed using existing techniques, or in the manner described below in this e...

Embodiment 3

[0036] Example 3 Using FITC-IP 3 Fluorescence Polarization (FP) Experiments for Fluorescent Labels

[0037] FP measurements were performed in a temperature-controlled chamber on 96-well, half-area, black round-bottom polystyrene microplates (Greiner Bio-One, Gloucester, UK) using a Pherastar microplate reader (BMG Labtech, Aylesbury, UK) reading. In this example, an automated liquid handling system (Qiagility; QIAGEN, Crawley, West Sussex, UK) was used to automate the liquid dilution. Much of the action of adding liquid to the microplate is also automated by the system. The accuracy and repeatability (usually 5% error after 8 serial dilutions) of this automated system, which was evaluated periodically at regular intervals, was higher than that of manual pipetting.

[0038] Fluorescence polarization saturation binding assay experiment: acceptor polypeptides (containing 0.4-400 nM IP 3 binding site) with FITC-IP 3 (0.5 nM ) to a final volume of 50ul.

[0039] Fluores...

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Abstract

The invention discloses a screening method for IP3 receptor target medicine based on fluorescence polarization analysis. The screening method measures the dissociation equilibrium constant KD value of ligands at different temperatures for the first time and initially measures the free energy change of combined ligands at different temperatures according to the dissociation equilibrium constant KDvalue of ligands at different temperatures. Compared with the existing most accurate medicine efficacy forecasting techniques, such as electrophysiology, Nuclear Magnetic Resonance and the like, the screening method provided by the invention can forecast medicine efficacy more accurately since the function of medicine on target can be accurately quantized by thermodynamics. In addition, the screening method has characteristics of high flux and mini-experiment property. Therefore, the screening method provided by the invention will be the trend for forecasting target medicine efficacy.

Description

technical field [0001] The present invention relates to the technical field of targeted drug efficacy prediction methods, in particular, to IP based on fluorescence polarization analysis 3 Screening methods for receptor target drugs. Background technique [0002] In 1926 Perrin first described the phenomenon of fluorescence polarization he observed in a research paper. Fluorescent substances in solution are irradiated with a beam of polarized light of a single wavelength, which absorbs and emits corresponding polarized fluorescence. If the excited fluorescent substance is in a static state, the substance will still maintain the polarization of the original excitation light. If it is in a moving state, the polarized light emitted by the substance will be different from the polarization characteristics of the original excitation light, which is called fluorescence. depolarization phenomenon. [0003] In recent years, technologies based on this physical phenomenon are playin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 丁兆
Owner SICHUAN HUIYU PHARMA
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