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cDNA cloning of a novel trypsin inhibitor with similarity to pathogenesis-related proteins, and its frequent expression in human brain cancer cells.

Biochim. Biophys. Acta. 1998 Jan 21;1395(2):202-8
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摘要


A novel trypsin inhibitor (P25TI) with an apparent molecular size of 25 kDa has previously been purified from the culture medium of human glioblastoma cells. In this study, the cDNA encoding P25TI was isolated by the polymerase chain reaction (PCR) screening system, and its complete amino acid sequence was determined. The cDNA consisted of 1440 nucleotides and encoded a sequence of 258 amino acids. The deduced structure of P25TI seemed to consist of a putative signal peptide sequence (residues 1-25), a propeptide sequence (26-60) and a mature protein (residues 61-258). The P25TI sequence has no homology to other proteinase inhibitors, but has similarity to insect venom allergens, mammalian testis-specific proteins and plant pathogenesis-related proteins. P25TI mRNA was frequently expressed in human neuroblastoma and glioblastoma cell lines. Although Northern blotting analysis failed to detect P25TI mRNA in various human tissues, PCR analysis showed its expression in the brain, placenta and lymphocytes.

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