Expression, Purification, and Characterization of the Recombinant Pepsin Inhibitor from Ascaris suum

Author(s):  
Jeffrey Zalatoris ◽  
Chetana Rao-Naik ◽  
Gregory Fecho ◽  
Karen Girdwood ◽  
John Kay ◽  
...  
2011 ◽  
Vol 79 (2) ◽  
pp. 245-250 ◽  
Author(s):  
Nagampalli Raghavendra Sashi Krishna ◽  
N.S.A. Krushna ◽  
R.B. Narayanan ◽  
S.S. Rajan ◽  
K. Gunasekaran

2001 ◽  
Vol 48 (3) ◽  
pp. 763-774 ◽  
Author(s):  
K Zółtowska

Alpha-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 a-amylase from muscles with pl 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. Alpha-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 alpha-amylase. Both the muscle and intestine amylase lost half of its activity after 15 min at 70 degrees C and 50 degrees C, respectively. The Km values were: for muscle amylase 0.22 microg/ml glycogen and 3.33 microg/ml starch, and for intestine amylase 1.77 microg/ml glycogen and 0.48 microg/ml starch. Both amylases were activated by Ca2+ and inhibited by EDTA, iodoacetic acid, p-chloromercuribenzoate and the inhibitor of a-amylase from wheat. No significant differences were found between the properties of a-amylases from parasites and from their hosts.


1983 ◽  
Vol 9 (4) ◽  
pp. 297-307 ◽  
Author(s):  
Nuha J. Yacoub ◽  
Benja L. Allen ◽  
D.Michael Payne ◽  
Ruthann A. Masaracchia ◽  
Ben G. Harris

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