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. 1986 Jul;83(14):5106–5110. doi: 10.1073/pnas.83.14.5106

Structure of rat DNA polymerase beta revealed by partial amino acid sequencing and cDNA cloning.

B Z Zmudzka, D SenGupta, A Matsukage, F Cobianchi, P Kumar, S H Wilson
PMCID: PMC323899  PMID: 2873575

Abstract

A cDNA library of newborn rat brain poly(A)+ RNA in phage lambda gt11 was screened with a polyclonal antibody against chicken DNA polymerase beta. One positive phage was isolated and purified after testing 2 X 10(7) recombinants. This phage, designated lambda pol beta-10, contained an 1197-base-pair cDNA insert that corresponded to a mRNA with a poly(A) sequence at the 3' terminus and a single, long open-reading frame of 957 bases. The open-reading frame, starting 44 residues from the 5' end of the cDNA, predicted a 36,375-Da protein of 318 amino acids. Comparison of this deduced amino acid sequence with the partial sequence obtained with purified polymerase beta revealed a match of six tryptic peptides, involving a total of 47 amino acid residues. This confirmed the identity of the cDNA. Blot-hybridization analysis of newborn rat brain poly(A)+ RNA revealed a mRNA species of approximately the same size as the cDNA insert; in addition, a second mRNA species approximately equal to 4000 bases long was detected. Computer-derived secondary structure analysis of the enzyme predicted seven regions of alpha-helix distributed throughout and three regions of beta-sheet.

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Selected References

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