Factor Xa Substrate Protein

Substrates containing the fluorescent reporter group 6-amino-1-naphthalene-sulfonamide (ANSN) are useful compounds for monitoring the enzyme activity of various serine proteases (1-12). In this class of compounds, the ANSN reporter group is linked (in the R1 position) to short tri-peptide sequences. The peptide sequences are designed to optimize the interaction between the enzyme and substrate. Additional components which may be added to the R2 and R3 positions reflect changes in the P' subsite positions, and generally affect the kinetic parameters of the substrates. Compounds which are effective substrates are hydrolyzed between the tri-peptide and the ANSN group. Once cleaved from the peptide moiety, the ANSN group exhibits about a 1000 fold increase in relative fluorescence.

The kinetic properties listed below will aid in the selection of an appropriate substrate. The ANSN substrates have proved especially useful for the analyses of factor VIIa (1-5,7,9,10,12). Although the substrate hydrolysis rates are relatively slow for factor VIIa alone, several compounds exhibit a large change in kcat when tissue factor is incorporated into the assay system.

Small volumes of Factor Xa Substrate protein vial(s) may occasionally become entrapped in the seal of the product vial during shipment and storage. If necessary, briefly centrifuge the vial on a tabletop centrifuge to dislodge any liquid in the container`s cap. Certain products may require to ship with dry ice and additional dry ice fee may apply.

MBS634631 is a protein targeting Factor Xa Substrate. Also known as Factor Xa Substrate (Mes-D-LGR-ANSN(C2H5)2).