[gmx-users] how to split the disulfide bonds in CYSH?

[aixintiankong]

Dear, 
In my system ,there are many disulfide bonds in my  protein. 
i want to split these disulfide bonds to CYSH.
I use these command,  pdb2gmx -ignh -f 1AKI.pdb -o 110.pdb -p 110.top -water spce -ss  ,but i get the CYS2.
please help me ,thank you very much!