STAP-2/BKS, an adaptor/docking protein, modulates STAT3 activation in acute-phase response through its YXXQ motif

Mayu Minoguchi, Shigeru Minoguchi, Daisuke Aki, Akiko Joo, Tetsuya Yamamoto, Taro Yumioka, Tadashi Matsuda, Akihiko Yoshimura

Research output: Contribution to journalArticle

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Abstract

As a c-fms-interacting protein, we cloned a novel adaptor molecule, signal-transducing adaptor protein-2 (STAP-2), which contains pleckstrin homology- and Src homology 2-like (PH and SRC) domains and a proline-rich region. STAP-2 is structurally related to STAP-1/BRDG1 (BCR downstream signaling-1), which we had cloned previously from hematopoietic stem cells. STAP-2 is a murine homologue of a recently identified adaptor molecule, BKS, a substrate of BRK tyrosine kinase. STAP-2 was tyrosine-phosphorylated and translocated to the plasma membrane in response to epidermal growth factor when overexpressed in fibroblastic cells. To define the function of STAP-2, we generated mice lacking the STAP-2 gene. STAP-2 mRNA was strongly induced in the liver in response to lipopolysaccharide and in isolated hepatocytes in response to interleukin-6. In the STAP-2-/- hepatocytes, the interleukin-6-induced expression of acute-phase (AP) genes and the tyrosine-phosphorylation level of STAT3 were reduced specifically at the late phase (6-24 h) of the response. These data indicate that STAP-2 plays a regulatory role in the AP response in systemic inflammation. STAP-2 contains a YXXQ motif in the C-terminal region that is a potential STAT3-binding site. Overexpression of wild-type STAP-2, but not of mutants lacking this motif, enhanced the AP response element reporter activity and an AP protein production. These data suggest that STAP-2 is a new class of adaptor molecule that modulates STAT3 activity through its YXXQ motif.

Original languageEnglish
Pages (from-to)11182-11189
Number of pages8
JournalJournal of Biological Chemistry
Volume278
Issue number13
DOIs
Publication statusPublished - 2003 Mar 28
Externally publishedYes

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Signal Transducing Adaptor Proteins
STAT3 Transcription Factor
Acute-Phase Reaction
Chemical activation
Molecules
Tyrosine
Hepatocytes
Interleukin-6
Genes
Macrophage Colony-Stimulating Factor Receptors
Space time adaptive processing
Phosphorylation

ASJC Scopus subject areas

  • Biochemistry

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STAP-2/BKS, an adaptor/docking protein, modulates STAT3 activation in acute-phase response through its YXXQ motif. / Minoguchi, Mayu; Minoguchi, Shigeru; Aki, Daisuke; Joo, Akiko; Yamamoto, Tetsuya; Yumioka, Taro; Matsuda, Tadashi; Yoshimura, Akihiko.

In: Journal of Biological Chemistry, Vol. 278, No. 13, 28.03.2003, p. 11182-11189.

Research output: Contribution to journalArticle

Minoguchi, Mayu ; Minoguchi, Shigeru ; Aki, Daisuke ; Joo, Akiko ; Yamamoto, Tetsuya ; Yumioka, Taro ; Matsuda, Tadashi ; Yoshimura, Akihiko. / STAP-2/BKS, an adaptor/docking protein, modulates STAT3 activation in acute-phase response through its YXXQ motif. In: Journal of Biological Chemistry. 2003 ; Vol. 278, No. 13. pp. 11182-11189.
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AU - Aki, Daisuke

AU - Joo, Akiko

AU - Yamamoto, Tetsuya

AU - Yumioka, Taro

AU - Matsuda, Tadashi

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