Improvement in the Stability of Glycinecin A through Protein Fusion of the Two Structural Components

  • Kim, Youngmee (Department of Biochemistry, Cheju National University Medical School) ;
  • Somi K. Cho (Department of Biochemistry, Cheju National University Medical School) ;
  • Moonjae Cho (Department of Biochemistry, Cheju National University Medical School)
  • Published : 2001.09.01

Abstract

Glycinecin A, a bacteriocin produced by Xanthomonas campestris pv. glycines, inhibits the growth of X. c. pv. vesicatoria. We have reported that purified glycinecin A is composed of two polypeptides, is active over a wide range of pH (6 to 9), and is stable at temperatures up to 60$\^{C}$. Glycinecin A is a heterodimer consisting of 39- and 14-kDa subunits; the two encoding genes, glyA and glyB, respectively, have been cloned (Heu et al. 2001. Appl. Environ. Microbiol. 67, 4105-4110). Co-expression of glyA and glyB in the same cell is essential for bacteriocin activity. We constructed and produced a chimeric glycinecin A connecting glyA and glyB in one open reading frame. The chimeric glycinecin A has the same bactericidal activity as the wild-type glycinecin A. However, the chimeric glycinecin A is more stable in a wider range of pH and temperature.

Keywords

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