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. 1985 May;82(9):2652–2656. doi: 10.1073/pnas.82.9.2652

The 140-kDa adenovirus DNA polymerase is recognized by antibodies to Escherichia coli-synthesized determinants predicted from an open reading frame on the adenovirus genome.

B R Friefeld, R Korn, P J de Jong, J J Sninsky, M S Horwitz
PMCID: PMC397622  PMID: 2581253

Abstract

Sequence studies of the adenovirus 2 genome have revealed the presence of a large open reading frame (ORF) from 22.9 to 14.2 map units that is believed to encode most of the adenovirus DNA polymerase (Ad Pol). An 838-base-pair fragment (19.6-17.3 map units) containing approximately 25% of this ORF has been cloned and expressed in a beta-galactosidase-chloramphenicol acetyltransferase (lacZ-CAT) expression vector under the control of the trp-lac hybrid promoter. This recombinant vector directed the synthesis of a 58-kDa lacZ-Ad Pol-CAT fusion protein that has CAT activity. This fusion protein was easily purified by affinity chromatography in which chloramphenicol, the substrate for CAT, was covalently bound to a matrix. Antisera were prepared against the purified 58-kDa lacZ-Ad Pol-CAT fusion protein and were found to react specifically with the 140-kDa Ad Pol by ELISA and immunoblot analysis. In addition, these antisera recognized 120- and 29-kDa polypeptides in immunoblot analysis of partially purified terminal protein precursor (pTP)-Ad Pol complex. The exact nature of the 120- and 29-kDa polypeptides is not known, but they may be breakdown products of Ad Pol. Although the lacZ-Ad Pol-CAT fusion protein is not active in any of the Ad Pol enzymatic reactions, antibody against the prokaryotic fusion protein should be useful for screening bacteria harboring plasmids that have been constructed to express the entire Ad Pol ORF.

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Selected References

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