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Hydrogen Bonds01:04

Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Noncovalent Attractions in Biomolecules02:35

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
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Noncovalent Attractions in Biomolecules02:35

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Introduction to Chemical Bonds01:01

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Chemical Bonds
The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
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Protein Folding01:22

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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
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Hydrogen Bond Surrogate-Constrained Dynamic Antiparallel β-Sheets.

Sravanthi S Reddy1, Sunit Pal1, Sudip Ghosh1

  • 1Department of Organic Chemistry, Indian Institution of Science, 560 012, Bangalore, Karnataka, India.

Chembiochem : a European Journal of Chemical Biology
|March 22, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed novel dynamic beta-sheet models to study protein folding equilibrium. These models use a unique H-bond surrogate, providing new insights into the kinetics and thermodynamics of these crucial protein structures.

Keywords:
H-bond surrogatesH-bondsantiparallel beta-sheetscis/trans isomerismdynamic templates

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Area of Science:

  • Protein structure and dynamics
  • Biophysical chemistry
  • Molecular biology

Background:

  • Antiparallel beta-sheets are vital protein secondary structures.
  • The equilibrium dynamics between beta-sheets and random-coil states are poorly understood.
  • Understanding these dynamics is crucial for protein folding research.

Purpose of the Study:

  • To design and characterize the first dynamic beta-sheet models.
  • To mimic the equilibrium between antiparallel beta-sheets and random-coil states.
  • To investigate the structural, kinetic, and thermodynamic properties of this process.

Main Methods:

  • Design of novel dynamic beta-sheet models using an H-bond surrogate.
  • Introduction of constraint and torque into a tertiary amide bond.
  • Utilizing 2D Nuclear Magnetic Resonance (NMR) spectroscopy for analysis.

Main Results:

  • Successfully designed dynamic beta-sheet models mimicking the target equilibrium.
  • 2D NMR data provided detailed structural, kinetic, and thermodynamic information.
  • The models effectively represent the folding dynamics of beta-sheet structures.

Conclusions:

  • The developed models offer a new platform for studying protein secondary structure dynamics.
  • This work paves the way for analyzing biologically relevant isolated beta-sheets.
  • Provides a foundation for future research into protein folding mechanisms.