The Km values for this product have not been determined. Please see the link below to review a reference that may be helpful:
https://www.jbc.org/article/S0021-9258(19)83816-4/pdf
The activity of this enzyme is determined at pH 7.3 at 25 °C. Please see the link below to review the product assay protocol:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/137/309/g7882enz.pdf