# How to generate topology for a single aminoacid residue?

**URL:** <https://gromacs.bioexcel.eu/t/how-to-generate-topology-for-a-single-aminoacid-residue/8583>\
**Category:** User discussions\
**Tags:** pdb2gmx\
**Created:** [March 12, 2024, 5:40am UTC](https://gromacs.bioexcel.eu/t/how-to-generate-topology-for-a-single-aminoacid-residue/8583 "2024-03-12T05:40:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Giri](https://avatars.discourse-cdn.com/v4/letter/g/8baadc/32.png) [@Giri](https://gromacs.bioexcel.eu/u/Giri)\
**Post date:** [March 12, 2024, 5:40am UTC](https://gromacs.bioexcel.eu/t/how-to-generate-topology-for-a-single-aminoacid-residue/8583/1 "2024-03-12T05:40:53Z")

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GROMACS version:2016.3  
GROMACS modification: Yes/No  
Here post your question  
I have tried to simulate only one alanine residue with the available FFs of AMBER, GROMOS, CHARMM and OPLS. Later came to know that AMBER FFs do not support for standalone residues. So, which FF will be suitable for simulating individual aminoacid residue.