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BMP-2 and BMP-9 binding specificities with ALK-3 in aqueous solution with dynamics.

Orkid Coskuner1, Vladimir N Uversky2

  • 1The University of Texas at San Antonio, Department of Chemistry and Neurosciences Institute, One UTSA Circle, San Antonio, TX 78249, USA; Universität zu Köln, Institut für Physikalische Chemie, Luxemburger Strasse 116, Köln, Germany; Turkisch-Deutsche Universität, Molecular Biotechnology Division, Sahinkaya Caddesi, No. 71, Beykoz, Istanbul 34820, Turkey.

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Summary

Bone morphogenetic proteins (BMPs) are crucial signaling molecules. This study reveals BMP-2 binds more effectively to ALK-3 than BMP-9, offering insights for developing new regenerative therapies.

Keywords:
Activin receptor-like kinasesBone morphogenetic proteinsLigand receptor bindingMolecular dynamics simulationsSignalingWater

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Computational Biology

Background:

  • Transforming growth factor-β (TGF-β) superfamily signaling involves bone morphogenetic proteins (BMPs) interacting with serine-threonine kinase receptors.
  • Understanding BMP-ligand interactions with receptors like activin receptor-like kinase 3 (ALK-3) is crucial for elucidating cellular signaling pathways.
  • Current knowledge gaps exist regarding the precise molecular mechanisms governing BMP-receptor binding.

Purpose of the Study:

  • To computationally analyze the binding affinities and structural specificities of BMP-2 and BMP-9 to ALK-3 in solution.
  • To elucidate the molecular basis for differential binding between BMP-2/BMP-9 and ALK-3.
  • To identify potential strategies for enhancing BMP-9 binding to ALK-3 for therapeutic applications.

Main Methods:

  • Extensive molecular dynamics simulations were employed to study BMP-2/ALK-3 and BMP-9/ALK-3 interactions in aqueous solution.
  • Thermodynamic calculations were performed to assess the stability and binding free energies of the complexes.
  • Structural analysis focused on identifying key interaction regions and pathways between BMPs and ALK-3.

Main Results:

  • The BMP-2/ALK-3 complex demonstrated greater thermodynamic stability and a stronger binding affinity compared to the BMP-9/ALK-3 complex.
  • Structural analysis revealed a symmetrical binding pathway for BMP-2 with ALK-3, contrasting with an asymmetrical pathway for BMP-9.
  • Specific regions, particularly the Phe49 to Val70 loop in BMP-2, showed strong interactions with ALK-3, while BMP-9 exhibited weaker, non-continuous interactions.

Conclusions:

  • BMP-2 exhibits a preferential and more stable binding interaction with ALK-3 compared to BMP-9.
  • Mutating BMP-9 to incorporate features of the BMP-2 Phe49 to Val70 loop could enhance its ALK-3 binding affinity.
  • This research highlights the utility of computational methods in characterizing TGF-β superfamily protein interactions and suggests a novel approach for engineering BMPs for tissue regeneration and disease treatment.