primary miRNA transcripts (pri-miRNAs), most of which are transcribed by DNA-dependent
polymerase II (Pol II). miRNA levels are precisely controlled to maintain various biological
processes. Here, we report that SHORT VALVE 1 (STV1), a conserved ribosomal protein,
acts in miRNA biogenesis in Arabidopsis. A portion of STV1 localizes in the nucleus and
binds pri-miRNAs. Using pri-miR172b as a reporter, we show that STV1 binds the stem-loop …