2020 DOCK tutorial 3 with PDBID 4F4P
This tutorial teaches you how to dock a drug molecule to a receptor.
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4F4P is the crystal structure of Tyrosine Kinase SYK in complex with ligand LASW836. You can get the pdb file from here . The resolution is 2.37 Å
Checking the structure
Read the article related to the PDB file  to understand protonation states, charges, environmental conditions and other important information regarding the receptor and the ligand.
Open the pdb file through chimera and look at the structure.
Identify the main components of the model (receptor, ligand, solvent, cofactors). In our case, the protein contain one chain, ligand and sulfate(SO_4).
Prepare the Receptor file
In this part we are going to generate the receptor file and the ligand file that will going to be used in docking by chimera.
With the pdb file loaded by chimera, do Select -> Residue -> SO4 to select the sulfate. Use Actions -> Atoms/Bonds -> Delete to delete it. Then do Select -> Residue -> HOH to select the water molecules. Use the same method to delete it. Then do Select -> Structure -> ligand to select ligand molecule. Use the same method to delete it. Save the receptor as 4f4p_rec_noh.mol2.
Prepare the Ligand File
Open the pdf file again. Do Select -> Structure -> ligand to select the ligand. Do Select -> Invert (all models), then delete the selected atoms. This will left the ligand molecule only. Save it as 4f4p_lig_noh.mol2.
Adding hydrogen and charge
Now we are going to add hydrogen atoms and charges to our receptor and ligand. Open 4f4p_rec_noh.mol2 file again using Chimera and use the following instructions to prepare the receptor file to be used in DOCK. Tools -> Structure editing -> AddH. That command will add hydrogen to the receptor. Tools -> Structure editing -> Add Charge. That command will add charge to atoms to make the receptor neutral. Save the file as 4f4p_rec_h.mol2
Open 4f4p_lig_noh.mol2, follow the same steps for ligand file, add hydrogen and charges, and save the file as 4f4p_lig_h.mol2.