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Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Fluorescence Anisotropy as a Tool to Study Protein-protein Interactions
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A comparative molecular dynamics study on BACE1 and BACE2 flap flexibility.

H M Kumalo1, Mahmoud E Soliman1

  • 1a Molecular Modelling & Drug Design Research Group, School of Health Sciences, University of KwaZulu-Natal , Westville , Durban , South Africa.

Journal of Receptor and Signal Transduction Research
|January 26, 2016
PubMed
Summary

Beta-amyloid precursor protein cleavage enzyme1 (BACE1) and BACE2 are homologous aspartyl proteases. Molecular dynamics simulations reveal distinct flap dynamics and active site structures, crucial for developing Alzheimer's disease therapies.

Keywords:
BACE1 and BACE2flap dynamicsmolecular dynamicsparameterssequence analysis

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • Beta-amyloid precursor protein cleavage enzyme1 (BACE1) and BACE2 are homologous aspartyl proteases with distinct enzymatic properties.
  • Understanding their structural dynamics is key to developing targeted therapeutics, particularly for Alzheimer's disease.

Purpose of the Study:

  • To compare the dynamical flap behaviors of BACE1 and BACE2 using sequence analysis and all-atom molecular dynamic (MD) simulations.
  • To elucidate the relationship between protein sequence, structure, and dynamics in the BACE enzyme family.

Main Methods:

  • Sequence analysis to identify conserved residues in ligand-binding sites.
  • All-atom molecular dynamic (MD) simulations in ligand-free states.
  • Development and application of combined parameters (distance, dihedral angle, TriCα angle) to define asymmetric flap motion.

Main Results:

  • Most ligand-binding sites are conserved, consistent with aspartyl protease function.
  • Flaps exhibit ensemble conformations (closed, semi-open, open) in both BACE1 and BACE2.
  • BACE1 displays more flexible and less stable loops (10S and 113S) and a more spacious active site cavity compared to BACE2.

Conclusions:

  • Distinct flap dynamics and active site characteristics differentiate BACE1 and BACE2.
  • These findings provide insights into BACE enzyme family dynamics, aiding in the design of BACE inhibitors for Alzheimer's disease treatment.