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Related Concept Videos

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Protein Organization

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Related Experiment Video

Updated: Jul 15, 2025

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
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SSDraw: software for generating comparative protein secondary structure diagrams.

Ethan A Chen1, Lauren L Porter1,2

  • 1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894.

Biorxiv : the Preprint Server for Biology
|October 3, 2023
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Summary
This summary is machine-generated.

SSDraw generates publication-quality protein secondary structure diagrams from 3D structures. This tool aids in comparing homologous proteins and visualizing structural features for research.

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Area of Science:

  • Structural Biology
  • Bioinformatics

Background:

  • Protein secondary structure visualization is crucial for understanding protein function and evolution.
  • Comparing homologous proteins requires tools that can align and display structural features effectively.

Approach:

  • The SSDraw program generates publication-quality diagrams of protein secondary structures from 3D coordinates.
  • Diagrams can be customized with color-coding based on conservation scores, B-factors, or custom data.
  • Homologous protein diagrams can be registered using multiple sequence alignments for comparative analysis.

Key Points:

  • SSDraw facilitates the comparison of secondary structures and other properties among homologous proteins.
  • The tool supports the visualization of both conserved and divergent folds in related proteins.
  • Users can generate individual secondary structure diagrams or stacked comparative views.

Conclusions:

  • SSDraw provides a versatile platform for visualizing and comparing protein secondary structures.
  • The program enhances the analysis of protein structure-function relationships and evolutionary relationships.
  • Accessible via downloadable source code and a Google Colab notebook for ease of use.