Molecular modelers often face the challenge of running simulations on several conformations of a system or multiple molecular systems. Setting up each simulation separately can be time-consuming and prone to error. The GROMACS Wizard in SAMSON offers an elegant solution to this problem: batch preparation. This feature allows you to prepare multiple systems or conformations in one go, saving you valuable time and effort.
Why Batch Preparation Simplifies Workflows
Batch preparation is ideal when you need to:
- Run the same GROMACS workflow on a single molecular system with multiple conformations, such as for umbrella sampling.
- Process a set of different molecular systems with identical simulation parameters.
Instead of managing each project manually, you can set up all systems or conformations in a consolidated batch, reducing repetitive tasks and maintaining consistency in your simulation workflows.
Step-by-Step: Batch Preparation for a Single System with Many Conformations
When working with a single molecular system with multiple conformations, follow these steps to ensure a smooth setup:
- Load your trajectory or conformations into SAMSON: You can open a trajectory via
Home > File > Open(Ctrl/Cmd + O) or by dragging and dropping a file into SAMSON. - Create conformations: If you don’t already have predetermined conformations, SAMSON can generate them for you. Use tools such as the Twister extension, motion animations, or other compatible extensions like AutoDock Vina Extended or Normal Modes Analysis. For individual frames of a trajectory, you can export specific conformations using the Inspector or create conformations for all frames, then delete unwanted ones.
- Prepare with the GROMACS Wizard:
- Open the Prepare tab in the GROMACS Wizard and set your molecular system. This involves selecting a structural model in the Document view.
- Enable Batch preparation by checking the corresponding box.
- Select initial conformations or a path (e.g., trajectory frames) within the Document view. Click Set conformations or a path and validate the number of conformations using the slider provided.
- Choose settings for the force field, solvent, and periodic box. For batch projects, the periodic box can either be uniform for all conformations or adjusted per conformation to optimize computational efficiency.
- Click Prepare to finalize the setup. Your batch project will now contain numbered subfolders, each corresponding to a separate project. These folders are ready for the subsequent simulation steps.
Maximizing Efficiency with Batch Simulation
After preparation, you can proceed with batch simulations for energy minimization, equilibration, and molecular dynamics production. To handle computations efficiently:
- When working locally, each subproject in the batch will be added as a local job, allowing you to manage their status and priority in the Local jobs window.
- If you prefer Cloud computations, each subfolder will be treated as an individual Cloud job. You can monitor progress, download results, or import them as needed via the Cloud jobs window.
Using batch preparation significantly reduces setup time, especially for large-scale simulation projects. It ensures uniformity and minimizes the risk of human error, making it a highly effective tool for modelers working with complex molecular systems.
To explore the full details and capabilities of batch preparation, visit the official documentation page.
Note: SAMSON and all SAMSON Extensions are free for non-commercial use. You can download SAMSON at samson-connect.net.