Molecular designers often face the challenge of optimizing specific parts of complex molecular systems instead of the entire structure. This need arises when focusing on a specific area for detailed study or simulation. Performing selective minimization effectively is often a pain point. Fortunately, SAMSON offers an interactive and convenient way to achieve this using its minimization tools. In this post, we’ll guide you step-by-step through minimizing selected portions of molecules, helping you streamline your workflow.
Why Selective Minimization Matters
When working with molecular structures, running minimization on an entire system can be unnecessary and computationally expensive. For cases where attention is needed on a single molecule or a specific part of it, selective minimization is the ideal solution. It ensures both efficiency and focus while keeping the rest of the system untouched. SAMSON provides an intuitive way to handle this scenario, whether you’re minimizing single molecules or even smaller molecular fragments.
Minimizing a Single Molecule in SAMSON
If you have multiple molecular structures in your document but wish to minimize only one of them, follow these steps:
- Go to Interface > Preferences > Editors > Minimize and uncheck the Include all atoms in the document option.
- Select the molecule you want to minimize.
- Start the minimization process by clicking Edit > Minimize (shortcut:
Z).
It’s important to note that when minimizing a selection, SAMSON considers the entire connected component of the selection. For instance, selecting a single atom in a molecule will lead to the minimization of the entire molecule connected to that atom. If you need to minimize only part of a molecule, additional steps are required, which we’ll explore in the next section.
Minimizing a Part of a Molecule
Sometimes, only part of a molecule needs minimization, while keeping other parts frozen in their current state. This is particularly useful in localized studies. Here’s how you can achieve this in SAMSON:
- Select the entire molecule or leave the selection empty if you want to start from scratch.
- Freeze the part of the molecule you don’t want to minimize. Use Edit > Freeze to apply this.
- Next, select the specific part of the molecule you want to minimize.
- Unfreeze this selected part by clicking Edit > Unfreeze.
- Click Edit > Minimize to perform the minimization interactively while the rest of the molecule remains frozen.
Frozen atoms will retain their positions throughout the minimization. Visual cues in SAMSON make this easy: atoms marked as frozen are overlaid with a dark blue color in the viewport.
This approach enables precise control over the minimization process, preserving non-relevant sections of the structure while optimizing specific regions.
Customizing Minimization Options
SAMSON allows users to tailor the minimization process through its Preferences panel. You can modify minimizer options under the Minimize section in the Preferences panel. This flexibility helps ensure that the minimization aligns with your specific requirements.
Conclusion
Selective minimization in SAMSON is a powerful tool for focusing computational resources and refining specific parts of molecular structures. Whether you’re working on single molecules or sub-sections, the interactive minimization features and customization options make the process straightforward and efficient. To dive deeper into these capabilities, be sure to check out the full documentation at https://documentation.samson-connect.net/users/latest/minimizing/.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON now at https://www.samson-connect.net.