A dose-response relationship between gamma-irradiation and the cleavage of the imidazole ring of adenine in DNA to form formamidopyrimidine has been demonstrated. When the DNA aqueous solution was irradiated with 0.1 Gy under N2O, there is little evidence of imidazole ring cleavage. A significant increase in cleavage begins to be noticed above 1 Gy reaching a plateau at 1000 Gy. No formamidopyrimidine was formed when 2'-deoxyadenosine was irradiated with up to 1000 Gy. A dose of 100 Gy converts 18 per cent of adenine in DNA to formamidopyrimidine. In irradiated DNA aqueous solution 1000 Gy convert 25 per cent of adenine to formamidopyrimidine under N2O. Some of the adenine was converted to 7,8-dihydro-8-oxoadenine but in amount that is 20 per cent of that converted to formamidopyrimidine under N2O. There was more adenine in DNA converted to formamidopyrimidine under N2O than under N2.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/09553008314551261 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ginkgolide B regulates apoptosis, oxidative stress, and mitochondrial dysfunction in MPP-induced SK-N-SH cells by targeting HDAC4/JNK pathway.
Naunyn Schmiedebergs Arch Pharmacol
January 2025
Huai'an Hospital Affiliated to Yangzhou University, The Fifth People's Hospital of Huai'an), 1 Huaihe East Road, Huaiyin District, Huai'an City, Jiangsu Province, China.
Ginkgolide B (GB) is a bioactive constituent found in Ginkgo biloba leaves that has been long recognized as a protective agent against many neurological disorders. Our study aimed to examine the effect of GB in an in vitro Parkinson's disease (PD) model and to investigate its neuroprotective mechanism as a primary objective. SK-N-SH cells were challenged with 1-methyl-4-phenylpyridinium (MPP) to act as a PD-like model of neuronal damage.
View Article and Find Full Text PDFHalf-Sandwich Organometallic Ir(III) and Ru(II) Compounds and their Interactions with Biomolecules.
Chempluschem
January 2025
Faculty of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383, Wrocław, Poland.
This review highlights how a Ir(III) and Ru(II) coordination complexes can change theirs cytotoxic activity by interacting with a biomolecules such as deoxyribonucleic acid (DNA), human albumins (HSA), nicotinamide adenine dinucleotide (NADH), and glutathione (GSH). We have selected biomolecules (DNA, NADH, GSH, and HSA) based on their significant biological roles and importance in cellular processes. Moreover, this review may provide useful information for the development of new half-sandwich Ir(III) and Ru(II) complexes with desired properties and relevant biological activities.
View Article and Find Full Text PDFModeling and correction of protein conformational disease in iPSC-derived neurons through personalized base editing.
Mol Ther Nucleic Acids
March 2025
NYU Cardiovascular Research Center, NYU Grossman School of Medicine, New York, NY 100016, USA.
Altered protein conformation can cause incurable neurodegenerative disorders. Mutations in , the gene encoding neuroserpin, can alter protein conformation resulting in cytotoxic aggregation leading to neuronal death. Familial encephalopathy with neuroserpin inclusion bodies (FENIB) is a rare autosomal dominant progressive myoclonic epilepsy that progresses to dementia and premature death.
View Article and Find Full Text PDFRibose Sugar Alters Conformational Sampling of G•T Mismatched Duplex DNA.
Chem Asian J
January 2025
Indian Institute of Science Education and Research Bhopa;, Chemistry, IISER Bhopal, Chemistry, #229,, Academic Building #2, Bhopal bypass road, Bhauri, 462066, Bhopal, INDIA.
Polymerases erroneously incorporate Guanine-Thymine (dG•dT) mismatches in genomic DNA that further evades repair by transient sampling of tautomeric/ionic states compromising fidelity of repairing dG•dT mismatches. In conjunction, significant frequency of ribose (mis)incorporation in duplex DNA permits for misincorporated-mismatch in the genome. Ribose incorporated G(rG) mismatched with T(rG•dT) is the most stable across all misincorporated-mismatch calling into question the conformational consequences of the ribose sugar in addition to the mismatch.
View Article and Find Full Text PDFMethyl-dependent auto-regulation of the DNA N6-adenine methyltransferase AMT1 in the unicellular eukaryote Tetrahymena thermophila.
Nucleic Acids Res
January 2025
MOE Key Laboratory of Evolution & Marine Biodiversity and Institute of Evolution & Marine Biodiversity, Ocean University of China, Qingdao 266003, China.
DNA N6-methyladenine (6mA) is a potential epigenetic mark involved in gene transcription in eukaryotes, yet the regulatory mechanism governing its methyltransferase (MTase) activity remains obscure. Here, we exploited the 6mA MTase AMT1 to elucidate its auto-regulation in the unicellular eukaryote Tetrahymena thermophila. The detailed endogenous localization of AMT1 in vegetative and sexual stages revealed a correlation between the 6mA reestablishment in the new MAC and the occurrence of zygotically expressed AMT1.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!