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Related Concept Videos

Protein Organization01:24

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.
The primary structure of a protein is its amino acid sequence....
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Protein Folding01:22

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering
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Ab initio structure solution of proteins at atomic resolution using charge-flipping techniques and cloud computing.

Alan A Coelho1

  • 172 Cedar Street, Wynnum, Brisbane, QLD 4178, Australia.

Acta Crystallographica. Section D, Structural Biology
|January 6, 2021
PubMed
Summary
This summary is machine-generated.

Charge-flipping techniques rapidly solve large protein structures at atomic resolution using cloud computing. Modifications, including symmetry restraints, enhance success rates for difficult and low-resolution protein data.

Keywords:
Amazon Web ServicesFourier cyclingTOPAScharge flippingcloud computingprotein structure solutionstructure solution

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Area of Science:

  • Crystallography
  • Computational Biology
  • Structural Biology

Background:

  • Solving large protein structures at atomic resolution is crucial for understanding biological functions.
  • Traditional methods can be time-consuming and computationally intensive.
  • Charge-flipping is a powerful technique for structure determination.

Purpose of the Study:

  • To accelerate the process of solving large protein structures using charge-flipping.
  • To develop and refine charge-flipping strategies for challenging protein datasets.
  • To investigate the impact of symmetry restraints and modified peak intensity strategies.

Main Methods:

  • Utilized hundreds of virtual machines on Amazon Web Services cloud-computing platform.
  • Employed TOPAS and TOPAS-Academic software for charge-flipping calculations.
  • Implemented space-group symmetry restraints on electron density.
  • Developed a modified flipping strategy to negate 'uranium atom solutions'.

Main Results:

  • Achieved atomic resolution solutions for large protein structures in minutes.
  • Demonstrated enhanced success rates for difficult protein structures using modified techniques.
  • Showcased increased solution probability for low-resolution data with symmetry restraints.
  • Successfully addressed issues with 'uranium atom solutions'.

Conclusions:

  • Charge-flipping on cloud platforms offers a rapid and cost-effective solution for protein structure determination.
  • Advanced strategies, including symmetry restraints, significantly improve the robustness and applicability of charge-flipping.
  • These optimized techniques expand the scope of solvable protein structures, including challenging low-resolution cases.