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Example sentences for: nucleases
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The ERF superfamily genes are associated with a RusA superfamily nuclease/HJR and EndoVII fold nucleases (Fig.
As mentioned before, the N-encapsidated genome-length RNAs are indeed extremely resistant to nucleases, to the extent that formation of such nuclease-resistant RNA products is in fact considered a defining criterion for viral replication in vitro and in vivo [ 32 ] . While the resistance of the viral genomic RNA to dsRNA has important ramifications for antiviral therapy, it is also clear that the dsRNA approach cannot be used against cis -acting NNR viral genomic sequences such as the intergenic regions, for which the cDNA-based approach will continue to be the method of choice [ 16 ] . It is obvious that a creative combination of the two techniques will lead to exciting possibilities in the reverse genetics of RNA viruses and in the antiviral regimen.
This alignment could be extended to the enzymatic core of three characteristic Mg 2+-dependent endonucleases: the bovine DNAseI [ 29 ] and two apurinic/apyrimidinic (AP) DNA-repair endonucleases, i.e. the E. coli Exonuclease III [ 30 ] and the human HAP1 protein [ 31 ] . These nucleases share the same catalytic residues and form a similar four-layered α/β-sandwich motif.
It has been suggested in the case of RecT that it may compete with SSB for binding single strand overhangs and thereby make them available for the annealing process [ 3 ] . Similar interactions between other SSAPs and SSB, that probably coats the ssDNA generated by nucleases, appear likely.
Genes for SSAPs from all the 3 distinct superfamilies may also occur adjacent to or in the vicinity of genes encoding nucleases or Holliday junction resolvases (HJRs).
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