title: Molecular cloning of cDNA for SPase, a monkey cathepsin L orthologue.
abstract: SPase is a cysteine protease isolated from an African green monkey kidney cell line, CV-1, and has selective cleavage activity toward transcription factor SP-1 and retinoblastoma susceptibility gene product RB. In this study, a cDNA encoding SPase was cloned from a cDNA library prepared from CV-1 cells. The cDNA clone encodes 333 amino acids and is 96.5% identical to human cathepsin L at the nucleotide and amino acid sequence levels. SPase appears to be translated as a preproenzyme based on the comparison between the deduced amino acid sequence and the N-terminal sequence of the purified enzyme. Northern blot analysis exhibited the considerably higher expression of SPase in CV-1 cells compared with COS-1 cells, showing a good correlation with enzymatic activity in these cell lines. Bacterially expressed SPase protein exhibited proteolytic activity toward SP-1 and RB proteins. These observations suggest that SPase is a monkey cathepsin L orthologue.
authors.affiliation: Oral Biology & Medicine, School of Dentistry University of California, Los Angeles, CA, 90095, USA.
authors.forename: Toru
authors.initials: T
authors.lastname: Nishinaka
authors.forename: Jun
authors.initials: J
authors.lastname: Song
authors.forename: Kristen
authors.initials: K
authors.lastname: Lum
authors.forename: Robert
authors.initials: R
authors.lastname: Chiu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D019556:COS Cells; D056668:Cathepsin L; D002403:Cathepsins / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D002460:Cell Line; D002522:Chlorocebus aethiops; D003001:Cloning, Molecular; D003546:Cysteine Endopeptidases / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D018076:DNA, Complementary / Q000378:metabolism*; D015723:Gene Library; D008969:Molecular Sequence Data; D010802:Phylogeny; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry; D017386:Sequence Homology, Amino Acid; D016329:Sp1 Transcription Factor / Q000378:metabolism
chemical_list: D018076:DNA, Complementary; D011994:Recombinant Proteins; D016329:Sp1 Transcription Factor; D002403:Cathepsins; D003546:Cysteine Endopeptidases; C534281:CTSL protein, human; D056668:Cathepsin L