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Related Concept Videos

Hydrogen Bonds00:26

Hydrogen Bonds

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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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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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An organism can have thousands of different proteins, and these proteins must cooperate to ensure the health of an organism. Proteins bind to other proteins and form complexes to carry out their functions. Many proteins interact with multiple other proteins creating a complex network of protein interactions.
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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.
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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
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Analyzing Protein Dynamics Using Hydrogen Exchange Mass Spectrometry
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Bridge: A Graph-Based Algorithm to Analyze Dynamic H-Bond Networks in Membrane Proteins.

Malte Siemers1, Michalis Lazaratos1, Konstantina Karathanou1

  • 1Freie Universität Berlin , Department of Physics, Theoretical Molecular Biophysics , Arnimallee 14 , D14195 Berlin , Germany.

Journal of Chemical Theory and Computation
|October 26, 2019
PubMed
Summary

Bridge is a new algorithm for analyzing hydrogen-bond networks in membrane proteins. It reveals extensive networks and transient bridging in channelrhodopsin, aiding structural biology and simulations.

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Area of Science:

  • Structural biology
  • Computational biophysics
  • Membrane protein dynamics

Background:

  • Membrane proteins, including transporters and receptors, require communication across the lipid bilayer for function.
  • Hydrogen bonds and their networks are critical for membrane protein motion and activity.
  • Understanding these interactions is vital for structural biology and computational simulations.

Purpose of the Study:

  • To introduce Bridge, an efficient algorithm for analyzing hydrogen-bond networks in membrane transporter and receptor proteins.
  • To apply Bridge to channelrhodopsin to investigate its proton transfer mechanisms.

Main Methods:

  • Development of the Bridge algorithm for hydrogen-bond network analysis.
  • Application of Bridge to the membrane protein channelrhodopsin.
  • Utilizing PyMol plugin for visualization and analysis.

Main Results:

  • Bridge identified extensive protein-water hydrogen-bond networks in channelrhodopsin.
  • An unanticipated hydrogen-bond network bridging two proton donors across ~20 Å was discovered.
  • Analysis of protein hydrogen bonds revealed rapid structural changes and identified key groups for proton transfer.

Conclusions:

  • The Bridge algorithm provides efficient analysis of hydrogen-bond networks in membrane proteins.
  • Bridge offers novel insights into the proton transfer mechanisms of channelrhodopsin.
  • The algorithm is a valuable tool for structural biology and computational simulations of membrane proteins.