| Literature DB >> 33542 |
A G Plaut, J V Gilbert, I Heller.
Abstract
An assay procedure for streptococcal IgA protease is described which uses isotopically labelled human serum IgA as substrate. Enzyme activity was monitored by the radioactive counts in the Fab alpha product, which was separated from other components in the digestion mixture by electrophoresis. Cleavage of IgA was linear with respect to time using catalytic amounts of the enzyme. Km was calculated to be 5.5 X 10(-6)M, pH optimum 6.0-7.0 at 37 degrees C, and the enzyme was fully inactivated at low concentrations of the metal chelator ethylenediaminetetraacetic acid.Entities:
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Year: 1978 PMID： 33542 DOI： 10.1007/978-1-4684-3369-2_55
Source DB: PubMed Journal: Adv Exp Med Biol ISSN： 0065-2598 Impact factor: 2.622