Biochemical characterisation of prolyl aminopeptidase from shoots of triticale seedlings and its activity changes in response to suboptimal growth conditions
Copyright © 2011 Elsevier Masson SAS. All rights reserved.
| Publié dans: | Plant physiology and biochemistry : PPB. - 1991. - 49(2011), 11 vom: 15. Nov., Seite 1342-9 |
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| Auteur principal: | |
| Autres auteurs: | , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2011
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| Accès à la collection: | Plant physiology and biochemistry : PPB |
| Sujets: | Journal Article Research Support, Non-U.S. Gov't Metals, Heavy Naphthalenes Plant Proteins Protease Inhibitors Protein Subunits 2-naphthylamide 2243-82-5 Aminopeptidases plus... |
| Résumé: | Copyright © 2011 Elsevier Masson SAS. All rights reserved. Prolyl aminopeptidase (PAP) was isolated from the shoots of three-day-old triticale seedlings and was purified using a five-step purification procedure (acid precipitation, gel filtration, anion-exchange chromatography, hydrophobic chromatography and rechromatography). The enzyme was purified 460-fold with a recovery of 6%. Prolyl aminopeptidase appears to be a tetramer consisting of four subunits, each with a molecular weight of approximately 54kDa. Its pH and temperature optimum are pH 7.5 and 37°C, respectively. The enzyme prefers substrates with Pro and Hyp at the N-terminus, but is also capable of hydrolysing β-naphthylamides (β-NA) of Ala, Phe, and Leu. The K(m) value of PAP against Pro-β-NA was the lowest among the substrates tested and it was 1.47×10(-5)M. The activity of PAP was not inhibited by EDTA, 1,10-phenantroline, or pepstatin A. The most effective inhibitors were DFP, Pefabloc, and PMSF, which are serine protease inhibitors. However, significant inhibition was also observed in the presence of E-64, which modifies sulfhydryl groups. A significant increase of the aminopeptidase activity against Pro-β-NA was observed in shoots of triticale plants grown under salinity, drought stress, and in the presence of cadmium and aluminium ions in the nutrient solution |
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| Description: | Date Completed 12.03.2014 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1873-2690 |
| DOI: | 10.1016/j.plaphy.2011.05.008 |