Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Endoproteolytic Processing of Human Parathyroid Hormone in Saccharomyces cerevisiae Mutants Lacking Genes Encoding the Yap3, Mkc7, and Kex2 Endoproteases

  • Choi, Won-A. (Korea Research Institute of Bioscience and Biotechnology) ;
  • Kang, Hyun-Ah (Korea Research Institute of Bioscience and Biotechnology) ;
  • Chung, Bong-Hyun (Korea Research Institute of Bioscience and Biotechnology)
  • Published : 1999.10.01
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Abstract

When the human parathyroid hormone (hPTH) is expressed as a secretory product in S. cerevisiae, most of the secreted hPTH is internally cleaved by endoproteolytic processing. To investigate whether the yeast endoproteases such as Kex2p, Yap3p, and Mkc7p are involved in the endoproteolytic processing of hPTH in S. cerevisiae, hPTH was expressed in S. cerevisiae mutants deficient in one or two of the following well-known endoproteases such as Kex2p, Mkc7p, and Yap3p. Among these mutants, the yap3-disrupted(yap3$\Delta$) and yap3/mkc7-disrupted (yap3Δmkc7$\Delta$) yeasts showed a significant reduction in the extent of hPTH proteolysis. In contrast, the mkc7-disrupted (mkc7$\Delta$) yeast did not reduce the proteolysis of hPTH as compared to the wild type. This suggests that Mkc7p is not involved in the endoproteolytic processing of hPTH. It was also found that the kex2-disrupted (kex2$\Delta$) mutant was not able to secrete a detectable amount of hPTH.

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