If you are a molecular modeler, you’ve probably faced the challenge of setting up computations for various molecular states or systems. Doing this manually for each project can feel tedious and overwhelming. Thankfully, SAMSON’s GROMACS Wizard offers an efficient solution: batch preparation. Whether you are working on different conformations of the same molecule or entirely distinct systems, this feature simplifies the process, allowing you to focus on analysis rather than setup tasks.
Why Use Batch Mode?
The batch mode in GROMACS Wizard is specifically designed to run the same workflow across multiple molecular states or systems with minimal manual input. Common use cases include:
- Handling a single system with multiple conformations, such as performing umbrella sampling or testing structural variations.
- Operating on different systems, like a set of proteins, to run identical simulations with consistent parameters.
With batch preparation in SAMSON, you can save time, reduce errors, and standardize setups automatically.
Preparing a Single System with Many Conformations
To prepare a single system with multiple conformations, follow these steps:
- Load an existing trajectory in SAMSON via Home > File > Open or by dragging and dropping a trajectory file.
- If you don’t already have a trajectory, you can create one in various ways, such as using tools like Twister, motion animations, or other SAMSON extensions like Normal Modes Analysis.
- Go to the Prepare tab in GROMACS Wizard and select the molecular system from your Document view.
- Enable the [Optional] Batch preparation box and specify initial conformations or a path. Use the slider to confirm your conformations.
- Continue with Step 1 of the preparation by choosing the force field, solvent, and specifying the simulation parameters.
Considerations for Defining the Periodic Box
Setting up the periodic box is an essential part of batch preparation. For batch projects, the box can be:
- Based on all conformations via the Box lengths option, ensuring uniform box size across the batch.
- Per conformation with the Solute-box distance option, allowing differing box sizes for compact conformations to save computational time.
Preview your selections using the slider and adjust as necessary to adhere to conventions like the minimum image convention.
When to Use Batch Mode for Different Systems
Batch mode is also highly effective when working with an ensemble of molecular systems. For example, preparing simulations for multiple proteins becomes seamless:
- Prepare each system individually and store their preparation folders in a common batch folder.
- Rename the subfolders for clarity, if needed, and proceed to the next steps (such as energy minimization) efficiently.
Just ensure compatibility in parameters across your systems to avoid conflicts during the simulation workflows.
Next Steps
Once your batch project is ready, the subsequent steps—like energy minimization, equilibration, and molecular dynamics simulations—mirror the workflow for single systems. The computations can be run locally or launched in the Cloud for added convenience. SAMSON even enables job tracking for efficient monitoring, prioritization, and retrievability of results.
Learn more about batch computations in the detailed documentation.
SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON today at https://www.samson-connect.net.