6iq4
From Proteopedia
Nucleosome core particle cross-linked with a hetero-binuclear molecule possessing RAPTA and gold(I) 4-(diphenylphosphino)benzoic acid groups.
Structural highlights
Function[H2B1J_HUMAN] Core component of nucleosome. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling.[1] [2] [3] Has broad antibacterial activity. May contribute to the formation of the functional antimicrobial barrier of the colonic epithelium, and to the bactericidal activity of amniotic fluid.[4] [5] [6] Publication Abstract from PubMedTargeting defined histone protein sites in chromatin is an emerging therapeutic approach that can potentially be enhanced by allosteric effects within the nucleosome. Here we characterized a novel hetero-bimetallic compound with a design based on a nucleosomal allostery effect observed earlier for two unrelated drugs-the Ru(II) antimetastasis/antitumor RAPTA-T and the Au(I) anti-arthritic auranofin. The Ru(II) moiety binds specifically to two H2A glutamate residues on the nucleosome acidic patch, allosterically triggering a cascade of structural changes that promote binding of the Au(I) moiety to selective histidine residues on H3, resulting in cross-linking sites that are over 35 A distant. By tethering the H2A-H2B dimers to the H3-H4 tetramer, the hetero-bimetallic compound significantly increases stability of the nucleosome, illustrating its utility as a site-selective cross-linking agent. Crosslinking Allosteric Sites on the Nucleosome.,Batchelor LK, De Falco L, von Erlach T, Sharma D, Adhireksan Z, Roethlisberger U, Davey CA, Dyson PJ Angew Chem Int Ed Engl. 2019 Oct 28;58(44):15660-15664. doi:, 10.1002/anie.201906423. Epub 2019 Sep 18. PMID:31478581[7] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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