title: Possible involvement of a novel STAM-associated molecule "AMSH" in intracellular signal transduction mediated by cytokines.
abstract: STAM containing an SH3 (Src homology 3) domain and an immunoreceptor tyrosine-based activation motif was previously revealed to be implicated in signaling pathways immediately downstream of Jak2 and Jak3 tyrosine kinases associated with cytokine receptors. We molecularly cloned a novel molecule interacting with the SH3 domain of STAM, which was named AMSH (associated molecule with the SH3 domain of STAM). AMSH contains a putative bipartite nuclear localization signal and a homologous region of a c-Jun activation domain-binding protein 1 (JAB1) subdomain in addition to a binding site for the SH3 domain of STAM. AMSH mutant deleted of the C-terminal half conferred dominant negative effects on signaling for DNA synthesis and c-myc induction mediated by interleukin 2 and granulocyte macrophage-colony-stimulating factor. These results suggest that AMSH plays a critical role in the cytokine-mediated intracellular signal transduction downstream of the Jak2/Jak3.STAM complex.
authors.affiliation: Department of Microbiology and Immunology, Tohoku University School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Tanaka
authors.forename: K
authors.initials: K
authors.lastname: Kaneko
authors.forename: H
authors.initials: H
authors.lastname: Asao
authors.forename: H
authors.initials: H
authors.lastname: Kasai
authors.forename: Y
authors.initials: Y
authors.lastname: Endo
authors.forename: T
authors.initials: T
authors.lastname: Fujita
authors.forename: T
authors.initials: T
authors.lastname: Takeshita
authors.forename: K
authors.initials: K
authors.lastname: Sugamura
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000075686:COP9 Signalosome Complex; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D003001:Cloning, Molecular; D016384:Consensus Sequence; D004261:DNA Replication; D004268:DNA-Binding Proteins / Q000378:metabolism; D056827:Endosomal Sorting Complexes Required for Transport; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000378:metabolism; D017404:In Situ Hybridization, Fluorescence; D007376:Interleukin-2 / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D008969:Molecular Sequence Data; D010447:Peptide Hydrolases; D010750:Phosphoproteins / Q000378:metabolism*; D016271:Proto-Oncogene Proteins c-myc / Q000378:metabolism; D015398:Signal Transduction; D014157:Transcription Factors / Q000378:metabolism; D018909:src Homology Domains
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D056827:Endosomal Sorting Complexes Required for Transport; D007376:Interleukin-2; D047908:Intracellular Signaling Peptides and Proteins; D010750:Phosphoproteins; D016271:Proto-Oncogene Proteins c-myc; C109775:STAM protein, human; D014157:Transcription Factors; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D048031:JNK Mitogen-Activated Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D010447:Peptide Hydrolases; C501488:COPS5 protein, human; D000075686:COP9 Signalosome Complex