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- W4321480119 abstract "Abstract Proteins containing a RNB domain, originally identified in E. coli RNase II, are widely present throughout the tree of life. Many RNB proteins are endowed with 3’-5’ exoribonucleolytic activity but some have lost catalytic function during evolution. Database searches identified a new RNB domain containing protein in human: HELZ2. Analysis of genomic and expression data with evolutionary information suggested that the human HELZ2 protein is produced from an unforeseen non-canonical initiation codon in Hominidae. This unusual property was confirmed experimentally, extending the human protein by 247 residues. Human HELZ2 was further shown to be an active ribonuclease despite the substitution of a key residue in its catalytic center. HELZ2 harbors also two RNA helicase domains and several zinc-fingers and its expression is induced by interferon treatment. We demonstrate that HELZ2 is able to degrade structured RNAs through the coordinated ATP-dependent displacement of duplex RNA mediated by its RNA helicase domains and its 3’-5’ ribonucleolytic action. The expression characteristics and biochemical properties of HELZ2 support a role for this factor in response to viruses and/or mobile elements." @default.
- W4321480119 created "2023-02-23" @default.
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- W4321480119 date "2023-02-22" @default.
- W4321480119 modified "2023-09-30" @default.
- W4321480119 title "HELZ2: a new, interferon-regulated, human 3’-5’ exoribonuclease of the RNB family is expressed from a non-canonical initiation codon" @default.
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- W4321480119 doi "https://doi.org/10.1101/2023.02.22.529493" @default.
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