A Cyclophilin from Griffithsia japonica Has Thermoprotective Activity and Is Affected by CsA

  • Cho, Eun Kyung ;
  • Lee, Yoo Kyung ;
  • Hong, Choo Bong
  • Received : 2005.04.13
  • Accepted : 2005.05.15
  • Published : 2005.08.31

Abstract

Members of the multifunctional Cyp family have been isolated from a wide range of organisms. However, few functional studies have been performed on the role of these proteins as chaperones in red alga. For studying the function of cDNA GjCyp-1 isolated from the red alga (Griffithsia japonica), we expressed and purified a recombinant GjCyp-1 containing a hexahistidine tag at the amino-terminus in Escherichia coli. An expressed fusion protein, $H_6GjCyp-1$ maintained the stability of E. coli proteins up to $50^{\circ}C$. For a functional bioassay for recombinant $H_6GjCyp-1$, the viability of E. coli cells overexpressing $H_6GjCyp-1$ was compared with that of cells not expressing $H_6GjCyp-1$ at $50^{\circ}C$. After high temperature treatment for 1 h, E. coli overexpressing $H_6GjCyp-1$ survived about three times longer than E. coli lacking $H_6GjCyp-1$. Measurement of the light scattering of luciferase (luc) showed that GjCyp-1 prevents the aggregation of luc during mild heat stress and that the thermoprotective activity of GjCyp-1 is blocked by cyclosporin A (CsA), an inhibitor of Cyps. Furthermore, the Cyp-CsA complex inhibited the growth of E. coli under normal conditions. The results of the GjCyp-1 bioassays as well as in vitro studies strongly suggest that Cyp confers thermotolerance to E. coli.

Keywords

Cyclophilin;Escherichia coli;Griffithsia japonica;In Vivo and In Vitro Function;Thermotolerance

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Acknowledgement

Supported by : Crop Functional Genomics Center