Hello, I am a new GROMACS user. My aim is to simulate the protein tubulin with a GTP molecule present. When attempting to create a topology file I receive a Fatal Error stating that the "Residue GTP is not found in the topology database". I understand that GTP is not parameterized for the force field that I am using, and from what I have read of previous posts, creating a new *.itp file is rather complicated and not recommended for new users. As such, I would like to ask if anyone can recommend a starting point to learn more about simulations in GROMACS so that I can eventually learn how to run my intended simulation, i.e. tutorials dealing with the creation of *.itp files, or previous work that outlines some of the details. Thank-you.
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