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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 Organization01:13

Protein Organization

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Overview
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Protein and Protein Structure02:15

Protein and Protein Structure

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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.
A protein's shape is critical to its function. For example, an enzyme...
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Protein Folding01:22

Protein Folding

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Protein Folding01:25

Protein Folding

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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
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Peptide Bonds02:43

Peptide Bonds

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
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Bidirectional Electron-Transfer in Polypeptides with Various Secondary Structures.

Ping Han1, Ruiyou Guo1, Yefei Wang2

  • 1Department of Neurology, Haici Hospital Affiliated to Medical College of Qingdao University, Qingdao, 266033, Shandong, P.R. China.

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|November 29, 2017
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Summary
This summary is machine-generated.

Protein structural transitions impact bidirectional electron transfer (ET) rates, crucial for molecular wires. This study refines a model to quantitatively link structure changes to ET, revealing key influencing factors beyond simple energy gaps.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Chemistry

Background:

  • Protein-mediated bidirectional electron transfer (ET) is fundamental to molecular wire function.
  • Understanding how protein structural changes affect ET is crucial for applications like DNA mismatch detection by MutY glycosylase.
  • Existing models lack quantitative correlation between structural transitions and ET rates.

Purpose of the Study:

  • To quantitatively correlate structural transitions with electron transfer rates in proteins.
  • To explore the influence of various polyglycine structures on bidirectional ET.
  • To identify key structural factors governing inhomogeneous ET across different protein conformations.

Main Methods:

  • Refinement of the modified through-bond coupling (MTBC) model for quantitative ET rate analysis.
  • Computational study of diverse polyglycine structures (310-helix, α-helix, β-sheets, linear, polyproline helical I and II).
  • Analysis of HOMO-LUMO gaps, tunneling energy, Ramachandran angles, and vector alignments.

Main Results:

  • HOMO-LUMO gaps show significant directional differences (CN vs. opposite), except for polyproline I.
  • Bidirectional ET rates exhibit minimal differences when tunneling energy is equal across structures.
  • ET rates are influenced by Ramachandran angles, C=O vector alignment, peptide plane orientation, and other structural rearrangements during transitions.

Conclusions:

  • Structural transitions significantly influence protein-mediated electron transfer rates.
  • Factors beyond energy gaps, such as specific geometric alignments, are critical for understanding ET.
  • Findings provide insights for rationalizing inhomogeneous ET and designing improved protein molecular wires.