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- W2059919992 abstract "A metallo arginyl aminopeptidase (EC 3.4.11.6) activated by Co(2+) was isolated from Debaryomyces hansenii CECT 12487. The enzyme was purified after precipitation with protamine sulphate, followed by a weak anion exchange chromatography, gel filtration chromatography and a strong anion exchange chromatography. The arginyl aminopeptidase (AAP) was purified 337 folds, with a 18% recovery. The AAP appeared to be a dimer with a molecular mass of 101 kDa. The enzyme was active in the pH range from 6 to 9. The optimal activity was detected at pH 7.0 and at 37 degrees C. AAP activity was inhibited by typical aminopeptidase inhibitors (puromycin and bestatin), reducing agents (DTT), chelating agents (EDTA, EGTA and phenantroline) and sulphydryl groups reagents (iodoacetate). Ca(2+), Mn(2+) and Co(2+) activated the enzyme, while Cu(2+), Cd(2+), Hg(2+) and Mg(2+) inhibited it. The K(m) values calculated for Arg-AMC (7-amido-4-methylcoumarin) and Leu-AMC were 0.071 and 0.094 mM, respectively. The enzyme showed maximum specificity for basic amino acids (Arg and Lys), but was also able to hydrolyze non-charged amino acids (Leu, Met and Ala) and, at a minor rate, aromatic amino acids (Phe and Tyr). AAP showed higher activity when an acid residue was located at the C-terminal position of dipeptides. The described purification of an arginyl aminopeptidase from the yeast D. hansenii can contribute to the lack of knowledge about the exopeptidase activity in one of the yeasts more frequently isolated in sausage and to understand its role during the ripening of a fermented sausage." @default.
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- W2059919992 date "2003-09-01" @default.
- W2059919992 modified "2023-10-14" @default.
- W2059919992 title "Purification and properties of an arginyl aminopeptidase from Debaryomyces hansenii" @default.
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- W2059919992 doi "https://doi.org/10.1016/s0168-1605(03)00069-2" @default.
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