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• W2017030257 abstract "Restrictocin, a member of the alpha-sarcin family of site-specific endoribonucleases, uses electrostatic interactions to bind to the ribosome and to RNA oligonucleotides, including the minimal specific substrate, the sarcin/ricin loop (SRL) of 23S-28S rRNA. Restrictocin binds to the SRL by forming a ground-state E:S complex that is stabilized predominantly by Coulomb interactions and depends on neither the sequence nor structure of the RNA, suggesting a nonspecific complex. The 22 cationic residues of restrictocin are dispersed throughout this protein surface, complicating a priori identification of a Coulomb interacting surface. Structural studies have identified an enzyme-substrate interface, which is expected to overlap with the electrostatic E:S interface. Here, we identified restrictocin residues that contribute to binding in the E:S complex by determining the salt dependence [partial differential log(k 2/ K 1/2)/ partial differential log[KCl]] of cleavage of the minimal SRL substrate for eight point mutants within the protein designed to disrupt contacts in the crystallographically defined interface. Relative to the wild-type salt dependence of -4.1, a subset of the mutants clustering near the active site shows significant changes in salt dependence, with differences of magnitude being >or=0.4. This same subset was identified using calculated salt dependencies for each mutant derived from solutions to the nonlinear Poisson-Boltzmann equation. Our findings support a mechanism in which specific residues on the active site face of restrictocin (primarily K110, K111, and K113) contribute to formation of the E:S complex, thereby positioning the SRL substrate for site-specific cleavage. The same restrictocin residues are expected to facilitate targeting of the SRL on the surface of the ribosome." @default.
• W2017030257 created "2016-06-24" @default.
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• W2017030257 date "2008-08-01" @default.
• W2017030257 modified "2023-09-29" @default.
• W2017030257 title "Electrostatic Interactions Guide the Active Site Face of a Structure-Specific Ribonuclease to Its RNA Substrate" @default.
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• W2017030257 doi "https://doi.org/10.1021/bi800592g" @default.
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