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ligand conformer generation for enzyme design

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ligand conformer generation for enzyme design

Hi everyone,
I'm trying to generate ligand conformers for redesigning an enzyme. I had an input conformation, but when using it to generate conformers, it gave me this error:

Loading internal fraglib
81736 fragments loaded in 0.65 seconds

Title = untitled
Can't assign MMFF type to atom number 44 S
Warning: force field setup failed due to missing parameters for molecule untitled

Can you give me some hints on solving this problem?

Post Situation: 
Mon, 2013-02-11 16:51

I'm going to guess the ligand automagic-machinery can't figure out...something...about a sulfur atom. What is the chemical entity at that sulfur (thioether, thioester)? Does it look like any of the sulfur types in rosetta_database/chemical/mm_atom_type_sets/fa_standard/mm_atom_properties.txt? (I think that's the relevant file but I'm not sure).

Mon, 2013-02-11 17:55