the parameters setting about substrate

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yueyue
the parameters setting about substrate

Hello
The reaction of my research through two steps, first is the residue asp attack Cα of fluoroacetic (FAc) let fluoride leave and forms the intermediate colvalent enzyme ester complex . I want to carry out the MD simulation of IM system .but i am puzzled about the setting of parameters (in toppar )about IM, the residue asp is a part of the IM, i dont kown how to do about it .
I used http://www.swissparam.ch/ to generate the parameters of toppar previously .
Below is the pdb information of the IM
ATOM 830 N ASB 110 -8.589 -64.864 93.790 1.00 6.45 prot
ATOM 831 CA ASB 110 -9.067 -64.869 92.416 1.00 6.66 prot
ATOM 832 C ASB 110 -10.473 -64.228 92.403 1.00 8.03 prot
ATOM 833 O ASB 110 -10.629 -63.135 92.920 1.00 6.32 prot
ATOM 834 CB ASB 110 -8.913 -66.265 91.741 1.00 6.54 prot
ATOM 835 CG ASB 110 -9.359 -66.264 90.327 1.00 9.36 prot
ATOM 836 OD1 ASB 110 -8.447 -65.681 89.499 1.00 10.98 prot
ATOM 837 OD2 ASB 110 -10.394 -66.691 89.846 1.00 5.63 prot
ATOM 838 C2 ASB 110 -8.798 -65.485 88.139 1.00 12.87 prot
ATOM 839 C1 ASB 110 -9.567 -64.203 88.120 1.00 13.12 prot
ATOM 840 O1 ASB 110 -9.714 -63.391 89.022 1.00 14.08 prot
ATOM 841 O2 ASB 110 -10.155 -63.979 86.929 1.00 16.91 prot

It would be very helpful if someone can help me in this.
Thank you very much!