Phosphorylation of threonine 204 of DEAD-box RNA helicase DDX3 by cyclin B/cdc2 in vitro

Takeshi Sekiguchi, Yoshiko Kurihara, Junko Fukumura

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

DDX3 is a DEAD-box RNA helicase involved in human immunodeficiency virus mRNA export and translation. Previously, we reported that DDX3 is required for cyclin A expression. To examine whether DDX3 is regulated at the post-transcriptional level, we determined the phosphorylation sites of hamster DDX3 in vitro. Threonine 204 (Thr204) is a conserved amino acid residue of DDX3 homologues in yeast, frog, hamster, and human that is located within motif Q of DEAD-box RNA helicases. A Thr204 to Glu204 DDX3 mutant protein lost its function, suggesting that phosphorylation at Thr204 affects DDX3 function. Thr204 was phosphorylated by cyclin B/cdc2. Thr323 in motif Ib was also phosphorylated by cyclin B/cdc2 kinase. We propose a novel function of cyclin B/cdc2 kinase in mitosis, which is to cause a loss of DDX3 function to repress cyclin A expression and to decrease ribosome biogenesis and translation during mitosis.

Original languageEnglish
Pages (from-to)668-673
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume356
Issue number3
DOIs
Publication statusPublished - May 11 2007

Fingerprint

DEAD-box RNA Helicases
Cyclin B
Phosphorylation
Threonine
Cyclin A
Mitosis
Cricetinae
Phosphotransferases
Protein Biosynthesis
Mutant Proteins
Ribosomes
Viruses
Anura
Yeast
Yeasts
HIV
Amino Acids
Messenger RNA
In Vitro Techniques

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Phosphorylation of threonine 204 of DEAD-box RNA helicase DDX3 by cyclin B/cdc2 in vitro. / Sekiguchi, Takeshi; Kurihara, Yoshiko; Fukumura, Junko.

In: Biochemical and Biophysical Research Communications, Vol. 356, No. 3, 11.05.2007, p. 668-673.

Research output: Contribution to journalArticle

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