Understanding and Leveraging Segment Attributes in SAMSON

If you are a molecular modeler, you know the importance of efficiently managing and querying molecular segments while working on large and complex models. SAMSON, the integrative molecular design platform, provides a powerful way to streamline this process through its segment attribute space. In this post, we will explore how to effectively use segment attributes in SAMSON to enhance your productivity.

Why Use Segment Attributes?

Within molecular structures, a segment often represents a logical group, like a protein chain or a polymer chain. Managing and filtering data based on these segments is essential for many tasks, including simulation setups, visualization refinement, and analysis. Understanding the segment attribute space in SAMSON allows you to quickly identify and manipulate these segments based on specific characteristics.

Key Segment Attributes to Know

The segment attribute space (short name: s) provides a range of useful attributes to query and manipulate segment data. These attributes allow you to ask questions like:

  • Does the segment have a specific number of residues?
  • How many atoms, carbons, hydrogens, or other elements are part of this segment?
  • Is the segment visible or selected?

Inherited Attributes

Segment nodes inherit many attributes from parent attribute spaces, such as node and structuralGroup. Examples include:

  • s.hm (hasMaterial): Does the segment have material? Values are true or false.
  • s.h (hidden): Is the segment hidden? Values are true or false.
  • s.nat (numberOfAtoms): The total number of atoms present in the segment. Values are integers.
  • s.nC (numberOfCarbons): The number of carbon atoms in the segment. Values are integers.

These attributes enable you to create focused queries tailored to your research needs. For example:

Segment-Specific Attributes

Additionally, the segment attribute space introduces attributes specific to segments:

  • segment.numberOfResidues (short name: s.nr): Specifies the number of residues in the segment.
  • segment.numberOfStructuralGroups (short name: s.nsg): Specifies the number of structural groups in the segment.

These attributes allow highly specific manipulations. For example:

  • s.nr > 100 matches segments with more than 100 residues.
  • s.nsg 10:13 matches segments with a number of structural groups between 10 and 13.

Unlocking Efficiency

Whether you’re working on complex biomolecular systems or focused on smaller molecular designs, segment attributes provide a robust toolkit to refine, query, and manage your structures. These capabilities save time and improve accuracy in common tasks, like isolating specific regions of a molecule.

To learn about all segment-related attributes and explore deeper functionality, visit the official documentation page.

SAMSON and all SAMSON Extensions are free for non-commercial use. You can get SAMSON here.

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