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Method for suppressing non-specific protein interactions observed with affinity resins.


Type

Article

Change log

Authors

Rees, JS 
Lilley, KS 

Abstract

Previous high throughput data analysis from several different approaches to affinity purification of protein complexes have revealed catalogues of contaminating proteins that persistently co-purify. Some of these contaminating proteins appear to be specific to one particular affinity matrix used or even to the artificial affinity tags introduced into endogenous proteins for the purpose of purification. A recent approach to minimising non-specific protein interactions in high throughput screens utilises pre-equilibration of affinity surfaces with thiocyanate anions to reduce non-specific binding of proteins. This approach not only reduces the effect of contaminating proteins but also promotes the enrichment of the specific binding partners. Here, we have taken this method and adapted it in an attempt to reduce the abundance of common contaminants in affinity purification experiments. We found the effect varied depending on the bait used, most likely due to its endogenous abundance.

Description

Keywords

Animals, Chromatography, Affinity, Drosophila Proteins, Drosophila melanogaster, Mass Spectrometry, Thiocyanates

Journal Title

Methods

Conference Name

Journal ISSN

1046-2023
1095-9130

Volume Title

54

Publisher

Elsevier BV
Sponsorship
Wellcome Trust (076739/Z/05/Z)
This work was funded by the Wellcome Trust grant 076739/Z/05/Z.