Results 11 to 20 of about 77,265 (266)
Convergent allostery in ribonucleotide reductase [PDF]
Nature Communications, 2019 Ribonucleotide reductase (RNR) catalyzes the conversion of ribonucleotides to deoxyribonucleotides, which is an essential step in DNA synthesis. Here the authors use small-angle X-ray scattering, X-ray crystallography, and cryo-electron microscopy to ...
William C. Thomas +7 more
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Cold Spring Harbor Perspectives in Biology, 2010 It has normally been assumed that ribonucleotides arose on the early Earth through a process in which ribose, the nucleobases, and phosphate became conjoined. However, under plausible prebiotic conditions, condensation of nucleobases with ribose to give beta-ribonucleosides is fraught with difficulties.
John D. Sutherland
openalex +3 more sources
RIBONUCLEOTIDE REDUCTASES [PDF]
Annual Review of Biochemistry, 1998 Ribonucleotide reductases provide the building blocks for DNA replication in all living cells. Three different classes of enzymes use protein free radicals to activate the substrate. Aerobic class I enzymes generate a tyrosyl radical with an iron-oxygen center and dioxygen, class II enzymes employ adenosylcobalamin, and the anaerobic class III enzymes
A, Jordan, P, Reichard
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Pathogens, 2023 Ribonucleotide reductases (RRs or RNRs) catalyze the reduction of the OH group on the 2nd carbon of ribose, reducing four ribonucleotides (NTPs) to the corresponding deoxyribonucleotides (dNTPs) to promote DNA synthesis.
Chee-Hing Yang +5 more
doaj +1 more source
Parallel analysis of ribonucleotide-dependent deletions produced by yeast Top1 in vitro and in vivo [PDF]
, 2016 Ribonucleotides are the most abundant non-canonical component of yeast genomic DNA and their persistence is associated with a distinctive mutation signature characterized by deletion of a single repeat unit from a short tandem repeat.
Burgers, Peter M +5 more
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Impact of template backbone heterogeneity on RNA polymerase II transcription. [PDF]
, 2014 Variations in the sugar component (ribose or deoxyribose) and the nature of the phosphodiester linkage (3'-5' or 2'-5' orientation) have been a challenge for genetic information transfer from the very beginning of evolution.
Chong, Jenny +5 more
core +1 more source
Pegylated arginine deiminase synergistically increases the cytotoxicity of gemcitabine in human pancreatic cancer. [PDF]
, 2014 BackgroundPancreatic ductal adenocarcinoma has proven to be one of the most chemo-resistant among all solid organ malignancies. Several mechanisms of resistance have been described, though few reports of strategies to overcome this chemo-resistance have ...
Bold, Richard J +3 more
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Molecules, 2017 Despite the apparent clinical benefits of high-dose cytarabine (Ara-C) over lower dose Ara-C in acute myeloid leukemia (AML) therapy, the mechanism behind high-dose Ara-C therapy remains uncertain.
Zheng Li +6 more
doaj +1 more source
PLoS ONE, 2020 Ribonucleoside triphosphates are often incorporated into genomic DNA during DNA replication. The accumulation of unrepaired ribonucleotides is associated with genomic instability, which is mediated by DNA topoisomerase 1 (Top1) processing of embedded ...
Ayuna Takeishi +11 more
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Ribonucleolytic resection is required for repair of strand displaced nonhomologous end-joining intermediates [PDF]
, 2013 Nonhomologous end-joining (NHEJ) pathways repair DNA double-strand breaks (DSBs) in eukaryotes and many prokaryotes, although it is not reported to operate in the third domain of life, archaea. Here, we describe a complete NHEJ complex, consisting of DNA
Bartlett, Edward +2 more
core +1 more source