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When an object's velocity changes over time, the total distance traveled can be determined by summing small displacement intervals over short increments. This approach approximates the true distance through numerical summation and the use of integral calculus. An estimate of the total displacement can be obtained by measuring velocity at regular intervals and multiplying each value by the corresponding time step.If a runner accelerates over the first three seconds of a race, speed measurements...
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In geometry, measuring the direct distance between two points on a plane is essential in various practical and theoretical applications. Whether in navigation, engineering, or computer graphics, determining the shortest path between two locations involves using the distance formula. This formula is derived from the Pythagorean Theorem, which relates the lengths of the sides of a right triangle. On a coordinate plane, the horizontal and vertical distances between two points serve as the legs of...
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Precision DEER Distances from Spin-Label Ensemble Refinement.

Katrin Reichel1, Lukas S Stelzl1, Jürgen Köfinger1

  • 1Department of Theoretical Biophysics , Max Planck Institute of Biophysics , Max-von-Laue-Straße 3 , 60438 Frankfurt am Main , Germany.

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|September 14, 2018
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Summary
This summary is machine-generated.

Rotamer reweighting refines distance measurements in double electron-electron resonance (DEER) experiments. This method reveals subtle, Ångstrom-scale domain motions in proteins like Omp85.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Double electron-electron resonance (DEER) is crucial for measuring nanometer-scale distances in biomolecules.
  • Rotamer libraries aid in reducing positional uncertainties of spin labels.
  • Precise distance measurements are key to understanding protein dynamics.

Purpose of the Study:

  • To demonstrate the essential role of rotamer reweighting for high-precision distance measurements using DEER.
  • To reveal Ångstrom-scale domain motions in protein structures.
  • To apply advanced computational methods for extracting structural information from experimental data.

Main Methods:

  • Utilized extensive DEER measurements on the three N-terminal polypeptide transport-associated (POTRA) domains of the outer membrane protein Omp85.
  • Employed the Bayesian inference of ensembles maximum-entropy method to extract rotamer weights from DEER data.
  • Analyzed the impact of rotamer weight refinement on experimental model discrepancies.

Main Results:

  • Showed that rotamer reweighting is critical for accurate distance measurements in DEER experiments.
  • Demonstrated that small adjustments in rotamer weights can resolve 1-3 Ångstrom-scale domain motions.
  • Successfully eliminated significant discrepancies between experimental data and structural models.

Conclusions:

  • Rotamer-weight refinement is a powerful and simple tool for enhancing precision in distance measurements.
  • This technique is broadly applicable to various label-based biophysical methods, including DEER, PELDOR, and FRET.
  • The method enables the detection of subtle conformational changes and domain movements in proteins.