Hi Guang, You can use the GLYCAM force field, which has parameters for carbohydrates and glycoproteins compatible with AMBER99.
You can get the AMBER topology and structure files directly from their web interface, the "Online Glycoprotein Builder" ( http://glycam.ccrc.uga.edu/ccrc/gp/ <http://glycam.ccrc.uga.edu/ccrc/>), and them convert it to .top and .gro with the acpype script. I've done it sometimes. I hope it is helpful for you. best regards, Leandro 2012/8/30 陈应广 <525342...@qq.com> > Dear all I am interested in simulating a model of Glycoproteion. I > could'nt find the define of the residue in any forcefield .rtp file of GMX. > I am using Gromacs 4.5.5 . If any one can help me in getting forcefield > parameters for charmm27/ OPLS/Amber99 in gromacs format please respond. > Please suggest where else I should search for these. > > Thanking all > -- > gmx-users mailing list gmx-users@gromacs.org > http://lists.gromacs.org/mailman/listinfo/gmx-users > * Please search the archive at > http://www.gromacs.org/Support/Mailing_Lists/Search before posting! > * Please don't post (un)subscribe requests to the list. Use the > www interface or send it to gmx-users-requ...@gromacs.org. > * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists > -- gmx-users mailing list gmx-users@gromacs.org http://lists.gromacs.org/mailman/listinfo/gmx-users * Please search the archive at http://www.gromacs.org/Support/Mailing_Lists/Search before posting! * Please don't post (un)subscribe requests to the list. Use the www interface or send it to gmx-users-requ...@gromacs.org. * Can't post? Read http://www.gromacs.org/Support/Mailing_Lists