Practical Strategies for Colorizing Molecular Models in SAMSON

Colorizing molecular models is a critical step in molecular design workflows. It not only makes models visually engaging but also aids significantly in data interpretation. SAMSON, the integrative molecular design platform, offers rich tools to colorize structural nodes, visual models, as well as meshes and labels, using highly customizable color schemes. Whether you’re assigning uniform colors to structures, differentiating chains, or highlighting temperature factors, SAMSON facilitates this process with flexibility and an intuitive interface. Let’s dive into how to efficiently utilize these colorizing features.

Why is colorization important?

Molecular modelers often work with complex datasets that involve proteins, DNA, ligands, and more. Without proper visualization, spotting patterns like chain differentiation, charge variations, or structural properties becomes a monumental effort. SAMSON’s robust colorization tools allow clear segmentation and analysis, turning intricate data into visually accessible insights.

The Basics: Constant and Attribute-Based Color Schemes

The simplest way to start colorizing is by applying Constant colors. Whether it’s a residue or an atom, a constant color scheme ensures uniformity. However, for more nuanced interpretations, SAMSON allows you to map colors to attributes. You can colorize by:

  • Element Type: For example, use the standard Corey-Pauling-Koltun (CPK) color coding.
  • Chains: Easier identification of individual chains.
  • Temperature Factor: Visualize temperature fluctuations in structures.
  • Residue Hydrophobicity or Charge: Analyze residues based on their chemical properties.

These schemes can be applied contextually through the interface, the Visualization > Color menu, or SAMSON’s Inspector.

Illustrative Styles Inspired by Artwork

For those who appreciate visual style, SAMSON took inspiration from David Goodsell’s molecular artwork to include “illustrative” color schemes. These schemes maintain functional clarity while presenting visually appealing models. Turning your structural models into educational visuals has never been easier!

Modifying Color Palettes

If the default color palette isn’t quite right for your needs, SAMSON allows full customization. You can:

  • Switch between HSV (Hue-Saturation-Value) and HCL (Hue-Chroma-Luminance) color spaces.
  • Create discrete or continuous palettes, or use qualitative and diverging HCL palettes for refined control over transitions.
  • Preview how your settings affect the model with the Auto update function.

Additionally, SAMSON includes a Color Vision Deficiency Emulator to ensure your palettes are accessible to users with color vision impairments.

Color Vision Deficiency Emulator

Practical Application: A Quick Tutorial

Here’s a step-by-step example:

  1. Open a protein structure via Home > Fetch.
  2. Select your structural model in the Document View panel.
  3. Go to Visualization > Color > Per Attribute and choose “Residue Hydrophobicity.”
  4. Observe as the residues are colorized according to their hydrophobicity properties.

Colorization according to the residue hydrophobicity

Need to revert back to the default visualization? No problem. Select your model and choose Visualization > Color > Reset color or clear colors via the Inspector.

Reset the colorization by removing material using the toolbar

Learn More

Colorizing in SAMSON goes well beyond these basics. To explore more advanced techniques, visit the official documentation page.

Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get your version today at SAMSON Connect.

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