Characterization of the mammalian RNA exonuclease 5/NEF-sp as a testis-specific nuclear 3' → 5' exoribonuclease.

Characterization of the mammalian RNA exonuclease 5/NEF-sp as a testis-specific nuclear 3' → 5' exoribonuclease.
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DOI:
10.1261/rna.060723.117
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发表时间:
2017-09
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Pillai RS
Pillai RS
中科院分区:
其他
文献类型:
--
作者:
Silva S;Homolka D;Pillai RS

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Ribonucleases catalyze maturation of functional RNAs or mediate degradation of cellular transcripts, activities that are critical for gene expression control. Here we identify a previously uncharacterized mammalian nuclease family member NEF-sp (RNA exonuclease 5 [REXO5] or LOC81691) as a testis-specific factor. Recombinant human NEF-sp demonstrates a divalent metal ion-dependent 3′ → 5′ exoribonuclease activity. This activity is specific to single-stranded RNA substrates and is independent of their length. The presence of a 2′-O-methyl modification at the 3′ end of the RNA substrate is inhibitory. Ectopically expressed NEF-sp localizes to the nucleolar/nuclear compartment in mammalian cell cultures and this is dependent on an amino-terminal nuclear localization signal. Finally, mice lacking NEF-sp are viable and display normal fertility, likely indicating overlapping functions with other nucleases. Taken together, our study provides the first biochemical and genetic exploration of the role of the NEF-sp exoribonuclease in the mammalian genome.
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