Relevance of Arginine Residues in Cu(II)-induced DNA Breakage and Proteinase K Resistance of H1 Histones

Overview

Journal Sci Rep

Specialty Science

Date 2018 May 11

PMID 29743544

Citations 17

Authors

Marina Piscopo

Marco Trifuoggi

Carmela Scarano

Carla Gori

Antonella Giarra

Ferdinando Febbraio

Affiliations

Soon will be listed here.

Abstract

This work analyzes the involvement of arginines in copper/HO-induced DNA breakage. Copper is a highly redox active metal which has been demonstrated to form compounds with arginines. For this aim we used mixtures of pGEM3 DNA plasmid and two types of H1 histones which differ only in their arginine content. The sperm H1 histone from the annelid worm Chaetopterus variopedatus (arginine content 12.6 mol% K/R ratio 2) and the somatic H1 histone from calf thymus (arginine content 1.8 mol% and K/R ratio 15). Copper/HO-induced DNA breakage was observed only in presence of sperm H1 histones, but it was more relevant for the native molecule than for the deguanidinated derivative (K/R ratio 14), in which 80% of arginine residues were converted to ornithine. Further, copper induced proteinase K resistance and increase of DNA binding affinity on native sperm H1 histones. These observations are consistent with a copper induced reorganization of the side-chains of arginine residues. Copper, instead, did not affect DNA binding affinity of somatic and deguanidinated H1 histones, which show similar K/R ratio and DNA binding mode. These results indicate that arginine residues could affect these H1 histones properties and provide new insights into copper toxicity mechanisms.

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