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	Protein encoded by the Axin(Fu) allele effectively down-regulates wnt signaling but exerts a dominant negative effect on c-jun n-terminal kinase signaling
	Lu, Zailian ; Liu, Wei ; Huang, Huizhe ; He, Ying ; Han, Ying ; Rui, Yanning ; Wang, Yanhai ; Li, Qinxi ; Ruan, Ka ; Ye, Zhiyun ; Low, Boon Chuan ; Meng, Anming ; Lin, Sheng-Cai
	2010-05-11 ; 2010-05-11
关键词	MOUSE FUSED LOCUS BETA-CATENIN AXIS FORMATION XENOPUS EMBRYOS PATHWAY ZEBRAFISH JNK ACTIVATION DOMAINS COMPLEX Biochemistry & Molecular Biology
中文摘要	Axin plays an architectural role in many important signaling pathways that control various aspects of development and tumorigenesis, including the Wnt, transforming growth factor-beta, MAP kinase pathways, as well as p53 activation cascades. It is encoded by the mouse Fused (Fu) locus; the Axin(Fu) allele is caused by insertion of an IAP transposon. Axin(Fu/Fu) mice display varying phenotypes ranging from embryonic lethality to relatively normal adulthood with kinky tails. However, the protein product(s) has not been identified or characterized. In the present study, we conducted immunoprecipitation using brain extracts from the Axin(Fu) mice with specific antibodies against different regions of Axin and found that a truncated Axin containing amino acids 1-596 (designated as Axin(Fu-NT)) and the full-length complement of Axin (Axin(WT)) can both be generated from the AxinFu allele. When tested for functionality changes, Axin(Fu-NT) was found to abolish Axin-mediated activation of JNK, which plays a critical role in dorsoventral patterning. Together with a proteomics approach, we found that Axin(Fu-NT) contains a previously uncharacterized dimerization domain and can form a heterodimeric interaction with Axin(WT). TheAxin(Fu-NT)/Axin(WT) is not conducive to JNK activation, providing a molecular explanation for the dominant negative effect of Axin(Fu-NT) on JNK activation by wild-type Axin. Importantly, Axin(Fu-NT) exhibits no difference in the inhibition of Wnt signaling compared with Axin(WT) as determined by reporter gene assays, interaction with key Wnt regulators, and expression of Wnt marker genes in zebrafish embryos, suggesting that altered JNK signaling contributes, at least in part, to the developmental defects seen in Axin(Fu) mice.
语种	英语 ; 英语
出版者	AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC ; BETHESDA ; 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/26808]
专题	清华大学
推荐引用方式 GB/T 7714	Lu, Zailian,Liu, Wei,Huang, Huizhe,et al. Protein encoded by the Axin(Fu) allele effectively down-regulates wnt signaling but exerts a dominant negative effect on c-jun n-terminal kinase signaling[J],2010, 2010.
APA	Lu, Zailian.,Liu, Wei.,Huang, Huizhe.,He, Ying.,Han, Ying.,...&Lin, Sheng-Cai.(2010).Protein encoded by the Axin(Fu) allele effectively down-regulates wnt signaling but exerts a dominant negative effect on c-jun n-terminal kinase signaling..
MLA	Lu, Zailian,et al."Protein encoded by the Axin(Fu) allele effectively down-regulates wnt signaling but exerts a dominant negative effect on c-jun n-terminal kinase signaling".(2010).

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