Respective functions of two distinct siwi complexes assembled during PIWI-interacting RNA biogenesis in bombyx germ cells

Kazumichi M. Nishida, Yuka Iwasaki, Yukiko Murota, Akihiro Nagao, Taro Mannen, Yumiko Kato, Haruhiko Siomi, Mikiko C. Siomi

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

PIWI-interacting RNA (piRNA) biogenesis consists of two sequential steps: primary piRNA processing and the ping-pong cycle that depends on reciprocal Slicer-mediated RNA cleavage by PIWI proteins. However, the molecular functions of the factors involved remain elusive. Here, we show that RNAs cleaved by a Bombyx mori PIWI, Siwi, remain bound to the protein upon cleavage but are released by a DEAD box protein BmVasa. BmVasa copurifies with Siwi but not another PIWI BmAgo3. A lack of BmVasa does not affect primary piRNA processing but abolishes the ping-pong cycle. Siwi also forms a complex with BmSpn-E and BmQin. This complex is physically separable from the Siwi/BmVasa complex. BmSpn-E, unlike BmVasa, is necessary for primary piRNA production. We propose a model for piRNA biogenesis, where the BmSpn-E/BmQin dimer binds Siwi to function in primary piRNA processing, whereas BmVasa, by associating with Siwi, ensures target RNA release upon cleavage to facilitate the ping-pong cycle.

Original languageEnglish
Pages (from-to)193-203
Number of pages11
JournalCell Reports
Volume10
Issue number2
DOIs
Publication statusPublished - 2015 Jan 13

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Bombyx
Germ Cells
Cells
RNA
RNA Cleavage
Processing
Proteins
Dimers

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Respective functions of two distinct siwi complexes assembled during PIWI-interacting RNA biogenesis in bombyx germ cells. / Nishida, Kazumichi M.; Iwasaki, Yuka; Murota, Yukiko; Nagao, Akihiro; Mannen, Taro; Kato, Yumiko; Siomi, Haruhiko; Siomi, Mikiko C.

In: Cell Reports, Vol. 10, No. 2, 13.01.2015, p. 193-203.

Research output: Contribution to journalArticle

Nishida, Kazumichi M. ; Iwasaki, Yuka ; Murota, Yukiko ; Nagao, Akihiro ; Mannen, Taro ; Kato, Yumiko ; Siomi, Haruhiko ; Siomi, Mikiko C. / Respective functions of two distinct siwi complexes assembled during PIWI-interacting RNA biogenesis in bombyx germ cells. In: Cell Reports. 2015 ; Vol. 10, No. 2. pp. 193-203.
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