[논문]Cloning and Analysis of the DNA Polymerase-encoding Gene from Thermus filiformis

Jung, Seung Eun; Choi, Jeong Jin; Kim, Hyun Kyu; Kwon, Suk-Tae

doi:10.1016/s1016-8478(23)13377-2

Cloning and Analysis of the DNA Polymerase-encoding Gene from Thermus filiformis 원문보기

Molecules and cells, v.7 no.6, 1997년, pp.769 - 776

Jung, Seung Eun , Choi, Jeong Jin , Kim, Hyun Kyu , Kwon, Suk-Tae

Abstract ▼ AI-Helper

The gene encoding Thermus filiformis (Tfi) DNA polymerase was cloned and its nucleotide sequence was determined. The primary structure of Tfi DNA polymerase was deduced from its nucleotide sequence. Tfi DNA polymerase is comprised of 833 amino acid residues and its molecular mass was determined to be 93,890 Da. The deduced amino acid sequence of Tfi DNA polymerase showed a high sequence homology to E. coli DNA polymerase I-like DNA polymerases: 78.5% homology to Taq DNA polymerase, 78.4% to Tca DNA polymerase, and 41.8% to E. coli DNA polymerase I. An extremely high sequence identity was observed in the region containing polymerase activity. The G + C content of the coding region for the Tfi DNA polymerase gene was 68.5%, which was higher than that of the chromosomal DNA (65%). The G + C contents in the first, second, and third positions of the codons used were 71.8%, 40.9%, and 92.7% respectively. Codon usage in Tfi DNA polymerase was heavily biased towards the use of G + C in the third position. Rare codons with U or A as the third base were sometimes used to avoid using GA(A/T) TC and TCGA sequences, as they are recognition sites for the restriction endonucleases TfiI and TaqI.

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Cloning and Analysis of the DNA Polymerase-encoding Gene from Thermus filiformis 원문보기

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