Molecular modeling often involves working with biomolecules that have intricate structural characteristics, like side chains. For researchers and modelers, sifting through these components to extract meaningful insights or perform specific operations can feel like finding a needle in a haystack. This is where SAMSON’s Node Specification Language (NSL) offers powerful tools that make filtering and manipulating side chain data a breeze.
Today, we’ll explore how you can leverage the sideChain attribute space and its rich set of inherited attributes for precise customization and analysis.
What Is the sideChain Attribute Space?
The sideChain attribute space, denoted by the short name s, is designed to target side chain nodes exclusively. These attributes allow you to filter and interact with molecular side chains, unlocking new dimensions of control in your modeling workflow.
The attributes accessible in this space include a mix of inherited features from node and structuralGroup objects. In simpler terms, this means you get access to both universal node properties like visibility and attributes specific to groups, such as atomic composition and charge.
Examples of Useful Attributes
Let’s break this down with a few examples of what these attributes can do:
1. Check Material Properties
The hasMaterial attribute (hm) tells you whether a side chain owns materials. This could help determine which parts of your molecule have material definitions:
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sc.hm |
If you need to identify parts of the molecule that lack material, you can invert the condition:
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not sc.hm |
2. Search by Name
Using the name attribute (n), you can locate specific side chains based on their identifiers. For instance:
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sc.n "A" |
This query selects side chains named A. SAMSON also supports wildcards, allowing you to match patterns:
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sc.n "L*" |
3. Filter by Atomic Composition
The numberOfAtoms attribute (nat) helps you focus on side chains based on their atomic count. For instance:
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sc.nat < 1000 |
This selects side chains with fewer than 1000 atoms. A range of atomic counts can also be targeted, like this:
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sc.nat 100:200 |
4. Analyze by Charge
Use formalCharge (fc) or partialCharge (pc) to query specific charged side chains. For example:
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sc.pc > 1.5 |
This selects side chains whose partial charges are greater than 1.5. With ranges, you can narrow your search further:
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sc.pc 1.5:2.0 |
Where Can You Use These Filters?
These attributes shine in tasks like isolating functional groups, studying molecular interactions, or preparing specific regions of a biomolecular system for editing or simulation. Whatever your use case, the combination of concise short names with customizable filters ensures both speed and precision.
Conclusion
By tapping into the power of SAMSON’s sideChain attribute space, molecular modelers can dramatically improve their workflows. The filters are easy to implement and empower you to conduct more targeted analyses on complex molecules. Symbiotic use of attributes like sc.v (for visibility) or sc.nat (for atomic counts) ensures you can dissect any biomolecule at a granular level.
Want to delve deeper into these versatile filters and attributes? Head to the official SAMSON documentation page for the complete guide.
SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON today at samson-connect.net.