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A universal approach to prepare reagents for DNA-assisted protein analysis.


ABSTRACT: The quality of DNA-labeled affinity probes is critical in DNA-assisted protein analyses, such as proximity ligation and extension assays, immuno-PCR, and immuno-rolling circle amplification reactions. Efficient, high-performance methods are therefore required for isolation of pure conjugates from reactions where DNA strands have been coupled to antibodies or recombinant affinity reagents. Here we describe a universal, scalable approach for preparing high-quality oligonucleotide-protein conjugates by sequentially removing any unconjugated affinity reagents and remaining free oligonucleotides from conjugation reactions. We applied the approach to generate high-quality probes using either antibodies or recombinant affinity reagents. The purified high-grade probes were used in proximity ligation assays in solution and in situ, demonstrating both augmented assay sensitivity and improved signal-to-noise ratios.

SUBMITTER: Yan J 

PROVIDER: S-EPMC4169473 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature

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A universal approach to prepare reagents for DNA-assisted protein analysis.

Yan Junhong J   Gu Gucci Jijuan GJ   Jost Christian C   Hammond Maria M   Plückthun Andreas A   Landegren Ulf U   Kamali-Moghaddam Masood M  

PloS one 20140918 9


The quality of DNA-labeled affinity probes is critical in DNA-assisted protein analyses, such as proximity ligation and extension assays, immuno-PCR, and immuno-rolling circle amplification reactions. Efficient, high-performance methods are therefore required for isolation of pure conjugates from reactions where DNA strands have been coupled to antibodies or recombinant affinity reagents. Here we describe a universal, scalable approach for preparing high-quality oligonucleotide-protein conjugate  ...[more]

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