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• W2122446564 abstract "Mycobacterium tuberculosis RecA intein (PI-MtuI), a LAGLIDADG homing endonuclease, displays dual target specificity in response to alternative cofactors. While both ATP and Mn(2+) were required for optimal cleavage of an inteinless recA allele (hereafter referred to as cognate DNA), Mg(2+) alone was sufficient for cleavage of ectopic DNA sites. In this study, we have explored the ability of PI-MtuI to catalyze ATP hydrolysis in the presence of alternative metal ion cofactors and DNA substrates. Our results indicate that PI-MtuI displays maximum ATPase activity in the presence of cognate but not ectopic DNA. Kinetic analysis revealed that Mn(2+) was able to stimulate PI-MtuI catalyzed ATP hydrolysis, whereas Mg(2+) failed to do so. Using UV crosslinking, limited proteolysis and amino acid sequence analysis, we show that (32)P-labeled ATP was bound to a 14 kDa peptide containing the putative Walker A motif. Furthermore, the limited proteolysis approach disclosed that cognate DNA was able to induce structural changes in PI-MtuI. Mutation of the presumptive metal ion-binding ligands (Asp122 and Asp222) in the LAGLIDADG motifs of PI-MtuI impaired its affinity for ATP, thus resulting in a reduction in or loss of its endonuclease activity. Together, these results suggest that PI-MtuI is a (cognate) DNA- and Mn(2+)-dependent ATPase, unique from the LAGLIDADG family of homing endonucleases, and implies a possible role for ATP hydrolysis in the recognition and/or cleavage of homing site DNA sequence." @default.
• W2122446564 created "2016-06-24" @default.
• W2122446564 creator A5055941296 @default.
• W2122446564 date "2003-07-15" @default.
• W2122446564 modified "2023-09-24" @default.
• W2122446564 title "Mycobacterium tuberculosis RecA intein, a LAGLIDADG homing endonuclease, displays Mn2+ and DNA-dependent ATPase activity" @default.
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• W2122446564 doi "https://doi.org/10.1093/nar/gkg475" @default.
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