Hi,
I have been try to glycosilate an ASN residue by adding N-acetylglucosamine (GlcNAC). I could find server which does that (http://vienna-ptm.univie.ac.at/) but It gives me the output in GROMOS format with GROMOS parameters and I am interested in using CHARMM. On charmm-gui, glycan reader I couldn't find the option I was looking for. I can see that N-acetylglucosamine have been parameterize in charmm (name : AGALNA or BGALNA) but not the modified ASN residue. Does anyone know where can I get parameters for charmm ? If not then how can I combine the parameters of AGALNA and ASN to generate charmm parameters for PTM ASN.
Thanks,