# How to perform md simulation on a protein structure which have a ca+ ions

**URL:** <https://gromacs.bioexcel.eu/t/how-to-perform-md-simulation-on-a-protein-structure-which-have-a-ca-ions/11122>\
**Category:** User discussions\
**Tags:** pdb2gmx, forcefield, simulation-setup, topology\
**Created:** [January 23, 2025, 7:25am UTC](https://gromacs.bioexcel.eu/t/how-to-perform-md-simulation-on-a-protein-structure-which-have-a-ca-ions/11122 "2025-01-23T07:25:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![preena123](https://avatars.discourse-cdn.com/v4/letter/p/a5b964/32.png) [@preena123](https://gromacs.bioexcel.eu/u/preena123)\
**Post date:** [January 23, 2025, 7:25am UTC](https://gromacs.bioexcel.eu/t/how-to-perform-md-simulation-on-a-protein-structure-which-have-a-ca-ions/11122/1 "2025-01-23T07:25:30Z")

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I’m a beginner in molecular dynamics (MD) simulations, and I need guidance on how to perform MD simulations with a protein that includes a calcium ion (Ca⁺). My ultimate goal is to perform protein-ligand MD simulations. I’m unsure how to handle the calcium ion during MD simulation setup, particularly with force field parameters.