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Related Concept Videos

Method of Superposition01:20

Method of Superposition

The method of superposition is a crucial technique in structural engineering, used to analyze the effect of multiple loads on beams. This approach involves calculating the deflection and slope for each load on a beam separately, and then summing these effects to determine the overall impact. It is applicable only when the beam material remains within its elastic limit, ensuring that deformations are linearly elastic.
When applying the method of superposition, each type of load—whether...
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
Improving Translational Accuracy02:07

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
Internal Loadings in Structural Members: Problem Solving01:28

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When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal loadings...

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Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues
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Overcoming sequence misalignments with weighted structural superposition.

Nickolay A Khazanov1, Kelly L Damm-Ganamet, Daniel X Quang

  • 1Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI 48109-2218, USA.

Proteins
|June 27, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces HwRMSD, a novel method combining structural superposition and sequence alignment for homologous proteins. HwRMSD improves accuracy in protein alignment, crucial for drug design and large-scale biological data analysis.

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Area of Science:

  • Structural bioinformatics
  • Computational biology
  • Protein structure analysis

Background:

  • Sequence alignments alone often miss subtle similarities and differences between homologous proteins.
  • Standard RMSD overlays can propagate errors from initial sequence alignments.

Purpose of the Study:

  • To develop a robust technique (HwRMSD) for overlaying protein structures and aligning homologous protein sequences.
  • To overcome limitations of existing methods in handling low-sequence identity and conformational variations.

Main Methods:

  • Coupling Gaussian-weighted RMSD (wRMSD) with a sequence aligner and seed extension (SE) algorithm.
  • Utilizing structural superposition to refine sequence alignments.

Main Results:

  • HwRMSD demonstrates superior performance over standard RMSD for homologous protein alignment.
  • Achieves higher accuracy in residue pair placement (within 1 Å) compared to other structural alignment methods.
  • Corrected sequence alignments show good agreement with the HOMSTRAD database.

Conclusions:

  • HwRMSD provides a more accurate and robust method for aligning homologous proteins, especially those with low sequence identity or significant conformational differences.
  • The method enhances accuracy essential for drug design and automated, omics-scale sequence analysis.
  • Eliminates dependency on initial sequence pairing and the need to optimize alignment parameters for each protein pair.