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Exploring Structures and Dynamics of Protamine Molecules through Molecular Dynamics Simulations.

Hossain Shadman1, Caleb Edward Gallops1, Jesse D Ziebarth1

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Molecular dynamics revealed that protamines, essential for sperm DNA condensation, exhibit diverse disordered structures with secondary elements like helices and hairpin loops. These findings clarify protamine structure and bonding in eutherians.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Reproductive Biology

Background:

  • Protamines are crucial arginine-rich proteins for sperm DNA condensation.
  • Limited structural information exists for protamines, hindering understanding of their reproductive role.

Purpose of the Study:

  • To investigate the molecular structures of salmon, bull P1, and human P1 protamines using molecular dynamics.
  • To elucidate the conformational landscape and secondary structures of these protamines.
  • To predict intramolecular bonding patterns in eutherian protamines.

Main Methods:

  • Utilized molecular dynamics simulations to analyze protamine structures.
  • Examined protamine sizes, shapes, and conformational variations.
  • Analyzed inter-residue distances to predict potential intramolecular disulfide bonds.

Main Results:

  • Protamines displayed wide variations in size and shape, indicating significant disorder.
  • Identified secondary structures including helices and hairpin loops.
  • Predicted intramolecular bonding pairs in bull and human protamines consistent with prior research.

Conclusions:

  • Protamines possess disordered structures with dynamic conformational ensembles.
  • Hairpin loops may facilitate disulfide bonding in eutherian protamines, stabilizing DNA condensation.
  • Proposed a model of eutherian protamine structure with a charged core and disulfide-stabilized loops.