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In order to determine the biological relevance of two  S. acidocaldarius  proteins to the repair of UV photoproducts, the corresponding genes (Saci_1227 and Saci_1096) were disrupted, and the phenotypes of the resulting mutants were examined by various genetic assays. The disruption used integration by homologous recombination of a functional but heterologous  pyrE  gene, promoted by short sequences attached to both ends  via  PCR. The phenotypic analyses of the disruptants confirmed that ORF Saci_1227 encodes a DNA photolyase which functions  in vivo , but they could not implicate ORF Saci_1096 in repair of UV- or other externally induced DNA damage despite its similarity to genes encoding UV damage endonucleases. The success of the gene-disruption strategy, which used 5′ extensions of PCR primers to target cassette integration, suggests potential advantages for routine construction of  Sulfolobus  strains.

SulfolobusMutants, Generated via PCR Products, Which Lack Putative Enzymes of UV Photoproduct Repair