1887

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Volume 57, Issue 7

Biochemical properties and primary structure of elastase inhibitor AFUEI from Free

Abstract

An elastase inhibitor from (AFUEI) was isolated, and its biochemical properties and primary structure examined. The inhibitor was purified by column chromatography using DE52 cellulose and Sephadex G-75, and was found to be homogeneous as indicated by a single band following discontinuous PAGE and SDS-PAGE. A molecular mass of 7525.1 Da was observed by matrix-assisted desorption/ionization time-of-flight mass spectroscopy. The elastolytic activity of elastases from , and human leukocytes was inhibited by AFUEI. However, the elastolytic activity of porcine pancreas elastase, elastase and elastase from snake venom was not affected by AFUEI. No inhibitory effect of DTT or 2-mercaptoethanol on the elastase inhibitory activity of AFUEI was observed. The amino acid sequence of AFUEI peptides derived from digests utilizing clostripain was determined by Edman sequencing. AFUEI was composed of 68 aa and had a calculated molecular mass of 7526.2 Da. The search for amino acid homology with other proteins demonstrated that aa 1–68 of AFUEI are 100 % identical to aa 20–87 of the hypothetical protein AFUA 3G14940 of .

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  • Accepted:
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Keyword(s): GAAPLNA, glutaryl-l-alanyl-l-alanyl-l-proryl-l-leucine p-nitroanilide , MALDI/TOF-MS, matrix-assisted desorption/ionization time-of-flight mass spectroscopy , Pe-AFUEI, S-pyridylethylated AFUEI and pNA, p-nitroanilide
SGM
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2008-07-01
2024-04-16
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Biochemical properties and primary structure of elastase inhibitor AFUEI from Aspergillus fumigatus
J. Med. Microbiol. 57, 803 (2008); https://doi.org/10.1099/jmm.0.47789-0
/content/journal/jmm/10.1099/jmm.0.47789-0
/content/journal/jmm/10.1099/jmm.0.47789-0
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