Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Pepstatin- Insensitive Carboxyl Proteinase: A Biochemical Marker for Late Lysosomes in Amoeba proteus

  • Hae Kyung Kwon (Department of Biology Education, College of Education, Seoul National University) ;
  • HyeonJung Kim (Department of Biology Education, College of Education, Seoul National University) ;
  • Tae In Ahn (Department of Biology Education, College of Education, Seoul National University)
  • Published : 1999.06.01
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Abstract

In order to find a biochemical marker for late Iysosomes, we characterized two cDNAs which were cloned by using a monoclonal antibody (mAb) against Iysosomes in Amoeba proteus as a probe. The two cDNAs, a 1.3-kb cDNA in pBSK-Iys45 and a 1.6-kb cDNA in pBSK-Iys60, were found to encode proteins homologous to pepstatin-insensitive carboxyl proteinases (PICPs). E. coli transformed with pBSK-Iys45 produced two immunopositive polypeptides (45 and 43 kDa) and the cDNA in 1274 bases encoded a 44,733-Da protein (Lys45) of 420 amino acids containing one site for a core oligosaccharide. On the other hand, E. coli transformed with pBSK-Iys60 produced several polypeptides (64, 54, 45, 41, and 37 kDa) reacting with the mAb. The cDNA contained 1629 bases and encoded a 59,231-Da protein (Lys60) of 530 amino acids containing two sites for asparagine-linked core oligosaccharides. These two cDNAs showed identities of 60.3% in nucleotide sequences and 23.6% in amino acid sequences. Lys45 and Lys60 appeared to share XXEFQK as a common antigenic domain. The amino acid sequence of the Lys45 protein showed 17.4% identity and 40.9% similarity to that of PICP from Pseudomonas sp. 101. On the other hand, Lys60 showed a 24.3% identity and 51.9% similarity with human Iysosomal PICP in the amino acid sequence. A putative active center for serine protease, GTS＊xxxxxFxG, was found to be conserved among PICP homologues. The two PICPs are the first reported enzymatic markers for late Iysosomes.

Keywords

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