Linked Life Data

20129830

Source:http://linkedlifedata.com/resource/pubmed/id/20129830

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2010-3-29
pubmed:abstractText
Hydrolytic deamination of DNA cytosine residues results in U/G mispairs, pre-mutagenic lesions threatening long-term genetic stability. Hence, DNA uracil repair is ubiquitous throughout all extant life forms and base excision repair, triggered by a uracil DNA glycosylase (UDG), is the mechanistic paradigm adopted, as it seems, by all bacteria and eukaryotes and a large fraction of archaea. However, members of the UDG superfamily of enzymes are absent from the extremely thermophilic archaeon Methanothermobacter thermautotrophicus DeltaH. This organism, as a hitherto unique case, initiates repair by direct strand incision next to the DNA-U residue, a reaction catalyzed by the DNA uridine endonuclease Mth212, an ExoIII homologue. To elucidate the detailed mechanism, in particular to identify the molecular partners contributing to this repair process, we reconstituted DNA uracil repair in vitro from only four purified enzymes of M. thermautotrophicus DeltaH. After incision at the 5'-side of a 2'-d-uridine residue by Mth212 DNA polymerase B (mthPolB) is able to take over the 3'-OH terminus and carry out repair synthesis generating a 5'-flap structure that is resolved by mthFEN, a 5'-flap endonuclease. Finally, DNA ligase seals the resulting nick. This defines mechanism and minimal enzymatic requirements of DNA-U repair in this organism.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1568-7856
pubmed:author
pubmed:copyrightInfo
2010 Elsevier B.V. All rights reserved.
pubmed:issnType
Electronic
pubmed:day
4
pubmed:volume
9
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
438-47
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Archaeal DNA uracil repair via direct strand incision: A minimal system reconstituted from purified components.
pubmed:affiliation
Institut für Mikrobiologie und Genetik, Georg-August-Universität Göttingen, Germany.
pubmed:publicationType
Journal Article