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Investigation of VDAC1 interaction with small molecules by Differential Scanning Fluorimetry(DSF) (CAT#: STEM-MB-0782-WXH)

Introduction

The voltage-dependent anion channel 1 (VDAC1) is the most abundant protein of the outer mitochondrial membrane (OMM). VDAC1 is responsible of approximatively 90% of the exchanges between the mitochondrion and the cytoplasm regulating the transport of most ions and metabolites of molecular weight less than 5 kDa. In addition, the channel is considered a hub protein interacting with many partners involved in the mitochondrial function including apoptosis. In response to a pro-apoptotic signal, VDAC1 was shown to homo-oligomerize forming a large pore that enables the release of apoptogenic factors from the mitochondrial intermembrane space (IMS) to the cytosol.
Small-molecule ligands specifically interacting with the channel provide an attractive way of exploring its structure-function relationships and can possibly be used as founding stones for future drug-candidates.




Principle

Differential Scanning Fluorimetry measures protein thermal unfolding by monitoring changes in fluorescence emission of a sample upon heating. This allows the determination of protein thermostability and complex formation even with weakly binding ligands by thermal shift assay. Differential Scanning Fluorimetry is therefore ideally suited for screening of optimum buffer conditions like pH, buffer composition and ionic strength. The technique is applicable to any biological sample, from soluble proteins to integral membrane proteins.

Applications

To identify low-molecular-weight ligands that bind and stabilize purified proteins.
To measure the denaturation and unfolding of proteins.

Procedure

1. Preparation of compound solutions
2. Preparation of buffer/additive screen plates
3. Preparation of compound storage plates
4. Equipment preparation
5. Sample preparation
36. Performing the scan

Materials

Real-time PCR instrument
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