O-Glycoprotease (IMPa) Denaturing Reaction Protocol (NEB #P0761)

Optimal enzyme concentration and incubation times may vary for a particular substrate. Reactions may be scaled-up linearly to accommodate larger amounts of substrate and larger reaction volumes. Typical reaction conditions are as follows:

  1. Combine 10 µg of glycoprotein in 20 mM Tris-HCl pH 8.0, 40 mM DTT, 0.1% SDS to a total reaction volume of 50 μL.

  2. Denature glycoprotein by heating reaction at 95°C for 10 minutes.

  3. Cool the reaction to room temperature.

  4. Purify the denatured glycoprotein using HiPPR Detergent Removal Resin (Thermo catalog #88306), according to manufacturer’s recommended protocol.  Recommended equilibration buffer: 20 mM Tris-HCl pH 8.0 or 20 mM HEPES pH 8.0.

    Note: any detergent removal spin column of choice may be used.

  5. To the detergent-free denatured glycoprotein, add 1 μL of O-Glycoprotease (IMPa), mix gently.

  6. Incubate at 37˚C for 2 hours.

    Note - Some substrates may require extended incubation periods (up to 18 hours at 37°C).


  • Recommended substrate to enzyme ratio is 10 µg substrate to 1 µL enzyme.

  • The optimal pH range for O-Glycoprotease (IMPa) is pH 7.0-8.0. Enzyme activity decreases significantly at pH values below 7.0 and above pH 8.0.

  • Reactions can be filtered or used immediately for analysis by MS or MS/MS.

  • Reactions can be stored frozen at -20°C for later use.