Dear gmx users, 

I'm working on simulating a protein with two cofactors (hem and 
tetrahydrofolat) and its substrate. I'm in the first stage; generating 
topology. I choose CHARMM27 as a force field and I'm little bit confused on how 
to generate tetrahydrofolate's topology. 

I tried the online tool of SwissParam but it doesn't work, although it worked 
with the substrate ( an amino-acide). 
Failure message: "Unfortunately, topology and parameters were not successfully 
generated for THG."

Is there any other tools that I can use? Are they reliable? In other words: 
what are my options (pros and cons of each server/method?).

Thank you in advance for your help. 

Regards. 

Zeineb 



                                                                                
  
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