The AMBER force field ff99SB-ILDN has been recently shown to perform best among other force fields. See paper by the Shaw group: "Systematic Validation of Protein Force Fields against Experimental Data"
However, AMBER is not free and does not scale very well on over 256 cores, which means that it is best to run the NAMD or GROMACS codes using the AMBER force field if you are running on more than 256 cores or do not have Amber.
However, you should carefully read and implement the directions in this document for use with NAMD (NOT the UIUC one), which should give you identical energies if followed carefully.
For use with GROMACS follow these instructions: http://code.google.com/p/acpype/wiki/TestingAcpypeAmb2gmx or http://chemistry.csulb.edu/ffamber/
Zoe
However, AMBER is not free and does not scale very well on over 256 cores, which means that it is best to run the NAMD or GROMACS codes using the AMBER force field if you are running on more than 256 cores or do not have Amber.
However, you should carefully read and implement the directions in this document for use with NAMD (NOT the UIUC one), which should give you identical energies if followed carefully.
For use with GROMACS follow these instructions: http://code.google.com/p/acpype/wiki/TestingAcpypeAmb2gmx or http://chemistry.csulb.edu/ffamber/
Zoe
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