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• W2070242007 abstract "The protein encoded by intron 1 of the single 23S rRNA gene of the archaeal hyperthermophile Pyrobaculum organotrophum was isolated and shown to constitute a homing-type DNA endonuclease, I-PorI. It cleaves the intron- 23S rDNA of the closely related organism Pyrobaculum islandicum near the site of intron insertion in Pb.organotrophum. In contrast, no endonuclease activity was detected for the protein product of intron 2 of the same gene of Pb.organotrophum which, like I-PorI, carries the LAGLI-DADG motif, common to group I intron-encoded homing enzymes. I-PorI cleaves optimally at 80 degrees C, with kcat and Km values of about 2 min-1 and 4 nM, respectively, and generates four nucleotide 3'-overhangs and 5'-phosphates. It can cleave a 25 base pair DNA fragment encompassing the intron insertion site. A mutation-selection study established the base pair specificity of the endonuclease within a 17 bp region, from positions -6 to +11 with respect to the intron-insertion site. Four of the essential base pairs encode the sequence involved in the intron-exon interaction in the pre-rRNA that is required for recognition by the RNA splicing enzymes. Properties of the enzyme are compared and contrasted with those of eucaryotic homing endonucleases." @default.
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• W2070242007 date "1994-01-01" @default.
• W2070242007 modified "2023-09-27" @default.
• W2070242007 title "DNA substrate specificity and cleavage kinetics of an archaeal homing-type endonuclease from Pyrobaculum organotrophum" @default.
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• W2070242007 doi "https://doi.org/10.1093/nar/22.22.4583" @default.
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