DNA groove preference shift upon phosphorylation of a protamine-like cationic peptide

Literature Information

Publication Date 2023-11-02
DOI 10.1039/D3CP03803C
Impact Factor 3.676
Authors

Prabal K. Maiti


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Abstract

Protamines, arginine-rich DNA-binding proteins, are responsible for chromatin compaction in sperm cells, but their DNA groove preference, major or minor, is not clearly identified. We herein study the DNA groove preference of a short protamine-like cationic peptide before and after phosphorylation, using all-atom molecular dynamics and umbrella sampling simulations. According to various thermodynamic and structural analyses, a peptide in its non-phosphorylated native state prefers the minor groove over the major groove, but phosphorylation of the peptide bound to the minor groove not only reduces its binding affinity but also brings a serious deformation of the minor groove, eliminating the minor-groove preference. As protamines are heavily phosphorylated before binding to DNA, we expect that the structurally disordered phosphorylated protamines would prefer major grooves to enter into DNA during spermatogenesis.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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