DNA uracil repair initiated by the archaeal ExoIII homologue Mth212 via direct strand incision

No genes for any of the known uracil DNA glycosylases of the UDG superfamily are present in the genome of Methanothermobacter thermautotrophicus ΔH, making it difficult to imagine how DNA-U repair might be initiated in this organism. Recently, Mth212, the ExoIII homologue of M. thermautotrophicus ΔH...

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Detalles Bibliográficos
Autores principales: Schomacher, Lars, Chong, James P. J., McDermott, Paul, Kramer, Wilfried, Fritz, Hans-Joachim
Formato: Texto
Lenguaje:English
Publicado: Oxford University Press 2009
Materias:
Genome Integrity, Repair and Replication
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2673441/
https://www.ncbi.nlm.nih.gov/pubmed/19240141
http://dx.doi.org/10.1093/nar/gkp102
Descripción
Sumario:No genes for any of the known uracil DNA glycosylases of the UDG superfamily are present in the genome of Methanothermobacter thermautotrophicus ΔH, making it difficult to imagine how DNA-U repair might be initiated in this organism. Recently, Mth212, the ExoIII homologue of M. thermautotrophicus ΔH has been characterized as a DNA uridine endonuclease, which suggested the possibility of a novel endonucleolytic entry mechanism for DNA uracil repair. With no system of genetic experimentation available, the problem was approached biochemically. Assays of DNA uracil repair in vitro, promoted by crude cellular extracts, provide unequivocal confirmation that this mechanism does indeed operate in M. thermautotrophicus ΔH.

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