How to protonate GLU

From: Kaique Gracia De Sá Billotta (
Date: Fri Jan 10 2020 - 11:56:05 CST

I have to protonate 3 GLU, but I never had to do this before.
The CHARMM topology file states that:

*PRES GLUP 0.00 ! patch for protonated glutamic acid, proton on
oe2 ! via acetic acid, use in a patch
statement and ! follow with
AUTOgenerate ANGLes DIHEdrals command*

However, I don't know how to generate the psf file applying this patch. Can
anybody help me?

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