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Human cystatin D: cDNA cloning, characterization of the E. coli expressed inhibitor, and identification of the native protein in saliva
- Freije, José P (author)
- Balbin, Milagros (author)
-
- Abrahamson, Magnus (author)
- Lund University,Lunds universitet,Avdelningen för klinisk kemi och farmakologi,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Clinical Chemistry and Pharmacology,Department of Laboratory Medicine,Faculty of Medicine
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- Velasco, Gloria (author)
- Dalboge, Henrik (author)
- Lopez-Otin, Carlos (author)
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- 1993
- 1993
- English.
- In: Journal of Biological Chemistry. - 1083-351X. ; 268:21, s. 15737-15744
- Journal article (peer-reviewed)
Abstract
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- A cDNA coding for cystatin D, a human member of the cystatin protein family, has been cloned after specific amplification of reverse- transcribed parotid gland RNA. After replacing the segment encoding the putative 20-residue signal peptide with one encoding the Escherichia coli OmpA leader sequence, the cDNA was expressed in E. coli. The isolated recombinant protein exhibited Ki values of 1.2 nM and > 1 microM for papain and cathepsin B, respectively. An antiserum raised against recombinant cystatin D recognized a protein in human saliva with electrophoretical mobility identical to that of the recombinant protein. Immunoenzymatic analysis revealed that this cysteine proteinase inhibitor is present in human saliva and tears at concentrations of 3.8 and 0.5 mg/liter, respectively, while it was not detected in seminal plasma, blood plasma, milk, or cerebrospinal fluid. Cystatin D purified from human saliva by immunosorption displayed a heterogeneous N-terminal end, with sequences starting at residues 5, 7, 9, and 11 of the predicted N-terminal portion of the mature protein. On the basis of structural and functional properties, cystatin D represents a novel cysteine proteinase inhibitor possibly playing a protective role against proteinases present in the oral cavity.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Läkemedelskemi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Medicinal Chemistry (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Farmakologi och toxikologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Pharmacology and Toxicology (hsv//eng)
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