At times, molecular modelers find themselves grappling with the challenge of making docking results more interpretable and visually clear. Whether you’re analyzing ligand-receptor interactions or simply prepping for a presentation, the ability to enhance the visual representation of your models makes a significant difference.
If you’ve struggled with illustrating binding sites, residues, or secondary structures, the FITTED Suite on SAMSON offers efficient tools to make these tasks manageable and insightful.
Why Visualize Molecular Docking Results?
Understanding molecular interactions can be complex, especially when dealing with sophisticated systems like a receptor-ligand docked complex. Clear visualization can help you:
- Quickly pinpoint residues surrounding a ligand.
- Highlight specific atom interactions like hydrogen bonds.
- Focus on areas critical for further analysis or communication of findings.
With SAMSON’s features, you can fine-tune your visualization to meet each of these needs effectively.
Adding a Secondary Structure and Visualizing Binding Sites
Once you’ve run a docking simulation with FITTED and loaded the results, let’s make your model easier to interpret. First, enhance the receptor’s structural model by adding a Ribbons secondary structure view.
1. In the Document view, select the processed receptor (e.g., 1E2K_pro) modeled after docking.
2. Go to the Visualization menu and choose Ribbons. This will add a new visual model representing the receptor’s secondary structure.
You can now hide the original receptor structure in the Document view for a cleaner visualization.
Isolating Binding Site Residues
Next, identify residues surrounding the ligand to focus on ligand-receptor interactions:
1. Select the resulting ligand (e.g., 1E2K_log.mol2_DockingRun_* in the document).
2. Navigate to Select > Biology > Binding sites. Customize the parameters to define the surrounding residues (e.g., by spatial distance from the ligand).
3. Click OK, and all nearby residues will be selected. Save this selection as a group for future reference: in the Document view, click Current selection > Create group.
Licorice and Color Customization
After you’ve selected the binding site residues:
1. To enhance clarity, add a Licorice visual model by selecting Licorice from the Visualization menu.
2. Optionally, you can colorize the receptor’s carbons (e.g., by residue index) to distinguish individual residues. Select the carbons using Select > Atoms > Carbons and colorize them using Visualization > Material > Per attribute.
Explore and Learn More
By using SAMSON’s visualization tools, you can create clear and meaningful representations of molecular docking results, aiding both analysis and communication. To delve deeper into these features, explore the original documentation page: https://documentation.samson-connect.net/tutorials/fitted/fitted-suite/.
*Note: SAMSON and all SAMSON Extensions are free for non-commercial use. You can download SAMSON at https://www.samson-connect.net.