Inositol 1,4,5-triphosphate receptor-binding protein released with inositol 1,4,5-triphosphate (IRBIT) associates with components of the mRNA3′ processing machinery in a phosphorylation-dependent manner and inhibits polyadenylation

Hélène Kiefer, Akihiro Mizutani, Shun Ichiro Iemura, Tohru Natsume, Hideaki Ando, Yukiko Kuroda, Katsuhiko Mikoshiba

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

IRBIT is a recently identified protein that modulates the activities of both inositol 1,4,5-triphosphate receptor and pancreas-type Na+/HCO3- cotransporter 1, and the multisite phosphorylation of IRBIT is required for achieving this modulatory action. Here, we report the identification of the cleavage and polyadenylation specificity factor (CPSF), which is a multi-protein complex involved in 3′ processing of mRNA precursors, as an additional binding partner for IRBIT. We found that IRBIT interacted with CPSF and was recruited to an exogenous polyadenylation signal-containing RNA. The main target for IRBIT in CPSF was Fip1 subunit, and the phosphorylation of the serine-rich region of IRBIT was required both for direct association with Fip1 in vitro and for redistribution of Fip1 into the cytoplasm of intact cells. Furthermore, tert-butylhydroquinone (tBHQ), an agent that induces oxidative stress, increased the phosphorylation level of IRBIT in vivo and in parallel enhanced the interaction between IRBIT and CPSF and promoted the cytoplasmic distribution of endogenous Fip1. In addition to CPSF, IRBIT interacted in vitro with poly(A) polymerase (PAP), which is the enzyme recruited by CPSF to elongate the poly(A) tail, and inhibited PAP activity in a phosphorylation-dependent manner. These findings raise the possibility that IRBIT modulates the polyadenylation state of specific mRNAs, both by controlling the cytoplasmic/nuclear partitioning of Fip1 and by inhibiting PAP activity, in response to a stimulus that alters its phosphorylation state.

Original languageEnglish
Pages (from-to)10694-10705
Number of pages12
JournalJournal of Biological Chemistry
Volume284
Issue number16
DOIs
Publication statusPublished - 2009 Apr 17
Externally publishedYes

Fingerprint

Cleavage And Polyadenylation Specificity Factor
Inositol 1,4,5-Trisphosphate Receptors
Polyadenylation
Phosphorylation
Inositol 1,4,5-Trisphosphate
Machinery
Carrier Proteins
Processing
Polynucleotide Adenylyltransferase
Messenger RNA
Oxidative stress
RNA Precursors
Serine
Pancreas
Cytoplasm
Proteins
Oxidative Stress
Association reactions
RNA

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Inositol 1,4,5-triphosphate receptor-binding protein released with inositol 1,4,5-triphosphate (IRBIT) associates with components of the mRNA3′ processing machinery in a phosphorylation-dependent manner and inhibits polyadenylation. / Kiefer, Hélène; Mizutani, Akihiro; Iemura, Shun Ichiro; Natsume, Tohru; Ando, Hideaki; Kuroda, Yukiko; Mikoshiba, Katsuhiko.

In: Journal of Biological Chemistry, Vol. 284, No. 16, 17.04.2009, p. 10694-10705.

Research output: Contribution to journalArticle

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AU - Kiefer, Hélène

AU - Mizutani, Akihiro

AU - Iemura, Shun Ichiro

AU - Natsume, Tohru

AU - Ando, Hideaki

AU - Kuroda, Yukiko

AU - Mikoshiba, Katsuhiko

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