Nippon Ishinkin Gakkai Zasshi
Online ISSN : 1882-0476
Print ISSN : 0916-4804
ISSN-L : 0916-4804
Original Articles
Isolation and Characterization of a Novel Elastase Inhibitor, AFLEI from Aspergillus flavus
Yoshiyuki OkumuraKenji OgawaKei-ichi UchiyaToshiaki Nikai
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2006 Volume 47 Issue 3 Pages 219-224


A novel elastase inhibitor from Aspergillus flavus (AFLEI) was isolated, and biochemical properties of AFLEI were examined. Column chromatography using diethylaminoethyl (DE) 52-Cellulose and Sephadex G-75 was used to purify the inhibitor. The final preparation was found to be homogeneous as indicated by a single band after disc polyacrylamide gel (PAGE) and isoelectric focusing electrophoreses. AFLEI had a molecular weight of 7,525.8 as determined by TOF-MS (time of flight mass spectrometry). The elastolytic activity of elastases from A. flavus, A. fumigatus and human leukocytes were inhibited by AFLEI. However, this activity from porcine pancreas elastase, trypsin, chymotrypsin, thrombin, and Ac1-Proteinase from snake venom was not affected by AFLEI. The fibrinogenase activity of the elastase from A. flavus was inhibited by AFLEI. AFLEI was inhibited by α2-macroglobulin. However, ethylenediaminetetraacetic acid (EDTA-2Na), benzamidine, chymostatin, tosyl phenylalanine chloromethyl ketone (TPCK) and dithiothreitol (DTT) did not show any inhibitory effect on the elastase inhibitory activity of AFLEI.

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© 2006 The Japanese Society for Medical Mycology
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