Quantification of Escherichia coli Genomic DNA Contamination in Recombinant Protein Preparations by Polymerase Chain Reaction and Affinity-Based Collection

Authors: Gregory C.A.¹; Rigg G.P.^{1, 2}; Illidge C.M.¹; Matthews R.C.^{1, 2}

Source: Analytical Biochemistry, Volume 296, Number 1, September 2001 , pp. 114-121(8)

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Abstract:

This study describes the development of a novel assay for the quantification of Escherichia coli genomic DNA contamination in recombinant protein samples. The technique is based on PCR amplification and digoxygenin labeling of the genes encoding 5S ribosomal RNA followed by affinity-based collection and detection. Samples containing 1 pg mL^-1 of extracted E. coli genomic DNA (gDNA) could be measured using this method. Using extracted E. coli gDNA as standards, a 35-cycle PCR reaction exhibited a linear response versus template concentration between 1 pg mL^-1 and1 ng mL^-1 genomic DNA even when diluted in a variety of buffering conditions. Comparison of the novel assay with a traditional filter binding and hybridization technique using recombinant protein samples confirmed that the procedure was accurate and sensitive. The assay described in this report is a safer and less expensive alternative to radioactive techniques employed for DNA quantification, utilizing readily available reagents and apparatus. Copyright 2001 Academic Press.

Keywords: recombinant protein; DNA contamination; E. coli; PCR; ELISA

Language: English

Document Type: Research article

Affiliations: 1: Manchester Royal Infirmary 2: Manchester Royal Infirmary, Manchester Royal Infirmary, University of Manchester, Oxford Road, Manchester, M13 9WL, United Kingdom

Publication date: 2001-09-01