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Thermostable DNA-Polymerase from the Thermophilic Archaeon Microorganism Archaeoglobus fulgidus VC16 and Its Features

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Abstract

A gene (No. AF0497 GenBank, USA) was cloned from the archaeon Archaeoglobus fulgidus strain found in the water of hot springs. This gene contains an open reading frame of 2346 base pairs which encodes a thermostable DNA-polymerase (762 amino acid residues). A recombinant protein Afu-pol with molecular weight of 94 kD was isolated in an Escherichia coli strain used as a producer and characterized. By site-directed mutagenesis in the afu-pol gene the amino acid residue Glu170 was replaced with Ala; this resulted in a complete loss of the 3"-5"-exonuclease activity of the enzyme. Thus, the Glu170 residue was suggested to be directly involved in formation of the 3"-5"-exonuclease site. Physicochemical features of the exodeficient enzyme form were studied, and the possible use of Afu(exo–)-pol in the polymerase chain reaction is shown.

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Authors and Affiliations

  1. School of Chemistry, Lomonosov Moscow State University, Moscow, 119992, Russia

    S. E. Chalov

  2. Timiryazev Russian Academy of Agricultural Sciences, Timiryazevskaya ul. 42, All-Russian Institute of Agricultural Biotechnology, Moscow, 127550, Russia

    O. L. Voronina, O. N. Sergienko & V. G. Lunin

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  1. S. E. Chalov
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  2. O. L. Voronina
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  3. O. N. Sergienko
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  4. V. G. Lunin
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Chalov, S.E., Voronina, O.L., Sergienko, O.N. et al. Thermostable DNA-Polymerase from the Thermophilic Archaeon Microorganism Archaeoglobus fulgidus VC16 and Its Features. Biochemistry (Moscow) 68, 301–308 (2003). https://doi.org/10.1023/A:1023054200483

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