On this page you can see 3D representation of the protein chain you choose and its basic annotation.
You also can see its primary and secondary structure.
Please select a single amino acid residue you would like to modify. Residues that can be modified are shown in white squares while not available ones are on gray background.
When you select one, system will present you a list of available PTMs to be applied. Please find one and press "Run calculation" button.
Site will enqueue your task to be calculated and then you'll get the report. Example of a report can be found here.
Warning: not every structure can be correctly modified. Some structures in PDB database are not correct enough. Unfortunately, there is no way to predict such problems before calculation is started, so there is always a risk to get an error because of bad structure.