One of the most daunting tasks in protein-ligand docking is accurately defining the binding site. Missteps in this process can lead to flawed docking results, wasting valuable time and computational resources. Fortunately, the FITTED Suite within the SAMSON molecular design platform offers intuitive ways to define binding sites, ensuring more reliable docking workflows.
In this blog post, we’ll focus on efficiently setting up a binding site using the FITTED Suite SAMSON Extension. Whether you’re performing non-covalent or covalent docking, understanding these techniques can save you countless hours and deliver accurate results.
Methods to Define a Binding Site
The FITTED Suite provides three straightforward options for defining a binding site during protein-ligand docking:
- From Bound Ligand: Use the position of an already bound ligand to specify the binding site.
- From Selection: Specify the binding site based on the centroid of selected atoms.
- From Position: Manually define the binding site by adjusting a sphere’s position in the SAMSON Viewport.
Step-by-Step Guide: From Bound Ligand
Let’s look at how to define a binding site using the “From Bound Ligand” option, the ideal choice when performing self-docking.
1. Navigate Your Document
After loading your structure in SAMSON, locate the bound ligand in the Document view. You can expand the hierarchy of chain A or search for the ligand by its identifier (e.g., TMC 500).
Pro Tip: To quickly find and select the ligand group, type its identifier in the search bar.
2. Use the FITTED Suite Interface
Open the FITTED Suite app (Home > Apps > Biology) or simply search for it in the SAMSON top menu search bar. Within the Define binding site section, select the From Bound Ligand option.
Once your ligand is selected in the Document view, click the Set button. The FITTED Suite will automatically center the search grid on the selected ligand’s position.
3. Adjust If Needed
If you do not have a bound ligand, you can instead use the From Position option to manually define the binding site. This involves moving a sphere representing the binding site’s center in the Viewport. Adjust its location and size as required to capture the relevant binding area for your docking workflow.
Streamline Your Docking Workflow
Accurate binding site definition doesn’t have to be a headache. With the FITTED Suite’s three flexible options, you can adapt your setup to fit the specificity of your project. This attention to detail not only improves docking accuracy but also enhances reproducibility in your molecular design process.
To dive deeper into the FITTED Suite and its functionalities, visit the official documentation page.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. You can download SAMSON at SAMSON Connect.