Running molecular dynamics simulations on numerous conformations or multiple systems can be a time-consuming, repetitive process. Manually setting up workflows for each state or system becomes daunting, especially for larger datasets. Thankfully, SAMSON’s GROMACS Wizard offers a powerful “batch computations” feature to simplify this process, allowing users to efficiently perform simulations across various molecular states or systems.
Why Batch Computations?
Imagine you are studying a protein with multiple conformations or conducting simulations for a series of related proteins. In a traditional setup, you’d need to prepare each simulation project individually, which is both error-prone and inefficient. Batch computations solve this problem by automating repetitive setup tasks while ensuring consistency in simulation parameters.
How to Utilize Batch Computations for a Single Molecular System with Multiple Conformations
The first scenario for batch computations involves running the same workflow on a single molecular system with various initial conformations. This is particularly useful in cases like umbrella sampling, where simulations start from different configurations.
Preparation Steps:
1. Load your trajectory or conformations into SAMSON by opening the file directly or using a simple drag-and-drop action.
2. If needed, you can create trajectories or conformations directly in SAMSON using tools like the Move editors or extensions such as Normal Modes Analysis.
3. For focus, selectively export specific trajectory frames as conformations, either via the Inspector or the Path > Create conformations from path option in the Document view.
Setting Up Batch Preparations:
Once the conformations or trajectories are in place, follow these steps:
- Open the Prepare tab in GROMACS Wizard.
- Assign a molecular system by selecting it in the Document view.
- Check the Batch preparation box.
- Select your conformations or trajectory path as initial states for subprojects by clicking the Set conformations or a path button. This displays the number of conformations and enables preview via a slider.
- Define settings like force fields, solvents, optional index groups, and ions in line with tutorial guidelines on Step 1: Prepare.
- Set the periodic box size, either uniformly across all conformations or tailored for each frame, ensuring sufficient solute-to-box distance to follow the minimum image convention.
With everything defined, clicking “Prepare” generates a batch project containing subfolders for each conformation or frame. Together, these subfolders form a single cohesive batch project while retaining their individuality.
Tip: Use the preview slider in the Batch preparation box to evaluate how well the periodic box fits different conformations.
Flexibility in Simulation Management
The prepared batch project seamlessly integrates with the next steps of the molecular dynamics pipeline: energy minimization, NVT equilibration, NPT equilibration, and production MD. Users can launch simulations either locally or in the cloud. Each subproject is treated as a separate job, ensuring efficiency and modularity in job management. You can even monitor, cancel, or pause jobs via the Local or Cloud jobs window in SAMSON.
Want to Learn More?
If you are interested in diving deeper into batch computations, from handling single systems to multiple systems with shared simulation parameters, read the full tutorial at the official documentation page.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON at SAMSON Connect.