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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Aspartyl aminopeptidase of Schizosaccharomyces pombe has a molecular chaperone function

  • Lee, Song-Mi (School of Biological Sciences and Technology, Chonnam National University) ;
  • Kim, Ji-Sun (Department of Food and Nutrition, Chonnam National University) ;
  • Yun, Chul-Ho (School of Biological Sciences and Technology, Chonnam National University) ;
  • Chae, Ho-Zoon (School of Biological Sciences and Technology, Chonnam National University) ;
  • Kim, Kang-Hwa (Department of Food and Nutrition, Chonnam National University)
  • Published : 2009.12.31
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Abstract

To screen chaperone proteins from Schizosaccharomyce pombe (S. pombe), we prepared recombinant citrate synthase of the fission yeast as a substrate of anti-aggregation assay. Purified recombinant citrate synthase showed citrate synthase activity and was suitable for the substrate of chaperone assay. Several heat stable proteins including aspartyl aminopeptidase (AAP) for candidates of chaperone were screened from the supernatant fraction of heat-treated crude extract of S. pombe. The purified AAP migrated as a single band of 47 kDa on SDS-polyacrylamide gel electrophoresis. The native size of AAP was estimated as 200 kDa by a HPLC gel permeation chromatography. This enzyme can remove the aspartyl residue at N-terminus of angiotensin I. In addition, AAP showed the heat stability and protected the aggregation of citrate synthase caused by thermal denaturation. This study showed that S. pombe AAP is a moonlight protein that has aspartyl aminopeptidase and chaperone activities.

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References

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