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. 1993 Aug 11;21(16):3867–3873. doi: 10.1093/nar/21.16.3867

Evaluation of the contingent replication assay (CRA) and its application to the study of the general transcription initiation factor, TFIIF.

G N Nallur 1, H A Vasavada 1, P R Sankhavaram 1, W J Xu 1, S M Weissman 1
PMCID: PMC309910  PMID: 8367303

Abstract

The Contingent replication assay (CRA) is a rapid assay for the screening and isolation of cDNAs by protein-protein or protein-DNA interactions in mammalian cells. The method has been shown to enrich a plasmid containing a cDNA encoding the bacterial replication-related protein, R6K, from a mixture of two plasmids. In this report we present data illustrating the sensitivity and selectivity of the method. Using the small subunit of TFIIF (Rap30) as a target, we demonstrate the enrichment of a clone encoding the large subunit, Rap74, from a cDNA library. Additional cDNA clones including human Rap30 and an anonymous cDNA clone homologous to members of the human cdc2 kinase family were enriched and isolated by a modified screening approach. The structure of these additional clones suggest that the CRA enriches for products that interact not only directly with the target protein but also through bridging by endogenous proteins.

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Selected References

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