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2001 | 48 | 3 |
Tytuł artykułu

Purification and characterization of alpha-amylases from the intestine and muscle of Ascaris suum [Nematoda]

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
α-Amylase (EC 3.2.1.1) was purified from the muscle and intestine of the parasitic helminth of pigs Ascaris suum. The enzymes from the two sources differed in their properties. Isoelectric focusing revealed one form of α-amylase from muscles with pI of 5.0, and two forms of amylase from intestine with pI of 4.7 and 4.5. SDS/PAGE sug­gested a molecular mass of 83 kDa and 73 kDa for isoenzymes of a-amylases from in­testine and 59 kDa for the muscle enzyme. α-Amylase from intestine showed maxi­mum activity at pH 7.4, and the enzyme from muscle at pH 8.2. The muscle enzyme was more thermostabile than the intestinal α-amylase. Both the muscle and intestine amylase lost half of its activity after 15 min at 70°C and 50°C, respectively. The Km val­ues were: for muscle amylase 0.22 ,ug/ml glycogen and 3.33 ,ug/ml starch, and for in­testine amylase 1.77 ug/ml glycogen and 0.48 ug/ml starch. Both amylases were acti­vated by Ca and inhibited by EDTA, iodoacetic acid, p-chloromercuribenzoate and the inhibitor of α-amylase from wheat. No significant differences were found between the properties of a-amylases from parasites and from their hosts.
Wydawca
-
Rocznik
Tom
48
Numer
3
Opis fizyczny
p.763-774,fig.
Twórcy
autor
  • University of Warmia and Masuria, Zolnierska 14, 10-561 Olsztyn, Poland
Bibliografia
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Bibliografia
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