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Bimolecular Fluorescence Complementation
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Exploring Calbindin-IMPase fusion proteins structure and activity.

James W Noble1, John R Atack2

  • 1University of Sussex, Sussex Drug Discovery Centre, Brighton, BN1 9QG, UK.

Biochemistry and Biophysics Reports
|May 11, 2022
PubMed
Summary
This summary is machine-generated.

Calbindin-D28k significantly enhances inositol monophosphatase (IMPase) activity when fused, revealing a V-shaped complex structure. This interaction offers new insights into IMPase regulation and potential therapeutic targets.

Keywords:
AutophagyBipolar disorderCalbindin-D28KFusion proteinInositolInositol monophosphataseSAXS

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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Neuroscience

Background:

  • Calbindin-D28k, a calcium-binding protein, is abundant in the mammalian central nervous system.
  • Calbindin-D28k enhances inositol monophosphatase (IMPase) activity, an enzyme crucial for inositol trisphosphate signaling and implicated in bipolar disorder treatment.
  • Previous studies suggested a 250-fold increase in IMPase activity and proposed an in silico model for the calbindin-D28k-IMPase interaction.

Purpose of the Study:

  • To explore the structural properties of the calbindin-D28k-IMPase complex.
  • To gain new insights into the biologically significant interaction between calbindin-D28k and IMPase.
  • To validate a preliminary in silico model through experimental characterization.

Main Methods:

  • Creation of fusion constructs linking calbindin-D28k and IMPase with flexible linkers.
  • Characterization of fusion protein activity, comparing it to isolated wild-type IMPase.
  • Small-angle X-ray scattering (SAXS) analysis to determine the overall shape of the protein complexes.

Main Results:

  • Fusion proteins exhibited 200%-400% higher activity than wild-type IMPase.
  • Small-angle X-ray scattering revealed the fusion proteins form a V-shaped, elongated, and less compact complex.
  • The experimental structure differed from the preliminary in silico model.

Conclusions:

  • Engineered fusion proteins demonstrate significantly enhanced IMPase activity.
  • The calbindin-D28k-IMPase complex adopts a distinct V-shaped conformation in solution.
  • These findings provide novel structural insights into calbindin-D28k-mediated IMPase regulation.