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- W2410641965 abstract "Potent and selective recognition and modulation of disease-relevant RNAs remain a daunting challenge. We previously examined the utility of the U1A N-terminal RNA recognition motif as a scaffold for tailoring new RNA hairpin recognition and showed that as few as one or two mutations can result in moderate affinity (low μM dissociation constant) for the human immunodeficiency virus (HIV) trans-activation response element (TAR) RNA, an RNA hairpin controlling transcription of the human immunodeficiency virus (HIV) genome. Here, we use yeast display and saturation mutagenesis of established RNA-binding regions in U1A to identify new synthetic proteins that potently and selectively bind TAR RNA. Our best candidate has truly altered, not simply broadened, RNA-binding selectivity; it binds TAR with subnanomolar affinity (apparent dissociation constant of ∼0.5 nM) but does not appreciably bind the original U1A RNA target (U1hpII). It specifically recognizes the TAR RNA hairpin in the context of the HIV-1 5′-untranslated region, inhibits the interaction between TAR RNA and an HIV trans-activator of transcription (Tat)-derived peptide, and suppresses Tat/TAR-dependent transcription. Proteins described in this work are among the tightest TAR RNA-binding reagents–small molecule, nucleic acid, or protein–reported to date and thus have potential utility as therapeutics and basic research tools. Moreover, our findings demonstrate how a naturally occurring RNA recognition motif can be dramatically resurfaced through mutation, leading to potent and selective recognition—and modulation—of disease-relevant RNA." @default.
- W2410641965 created "2016-06-24" @default.
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- W2410641965 date "2016-06-13" @default.
- W2410641965 modified "2023-09-25" @default.
- W2410641965 title "An Evolved RNA Recognition Motif That Suppresses HIV-1 Tat/TAR-Dependent Transcription" @default.
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- W2410641965 doi "https://doi.org/10.1021/acschembio.6b00145" @default.
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