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Cloning of the full-length gene of activin receptor-interacting protein2a and characterization of its interaction with ActR Ⅱ A

引用

Progress in Natural Science:Materials International 2007年第2期17卷 172-176页

作者： cui xueling, tai guixiang, zhang hongjun, fang lin and liu zhonghui (School of Basic Medical Sciences, Jilin University, Changchun 130021, China) School of Basic Medical Sciences Jilin University Changchun 130021 China

To investigate the mechanism of intracellular signal transduction mediated by activin receptors, the full-length gene encoding a novel activin receptor-interacting protein2a (ARIP2a) was identified from a mouse brain cDNA library. The sequences of ARIP2a and ARIP2, distribution of ARIP2a and ARIP2 mRNA in mouse tissues, and expression of ARIP2a and ARIP2 in activin-induced RAW264.7 cell were compared, and the interaction between ARIP2a and ActRIIA was confirmed. The sequence analysis revealed that the full-length gene of ARIP2a, which composed of 1008 bp and encoded 153 amino acid residues, shared high sequence identity with ARIP2 except the position of the 99th amino acid. RT-PCR assay showed that ARIP2a mRNA was highly expressed in brain, pituitary and testis, and moderately in pancreas and ovary, but undetectable in other tissues. Whereas, ARIP2 mRNA was widely distributed in all mouse tissues that we tested. Moreover, expression of ARIP2a mRNA was significantly decreased in activin-stimulated RAW264. 7 cells; however, the expression of ARIP2 mRNA was increased. Additionally, the interaction between ARIP2a and activin type IIA receptor (ActRIIA) was further demonstrated by mammalian two-hybrid assays and pull-down assays. Taken together, those results indicate that although ARIP2a is homologous to ARIP2, they are different in tissue distribution and responses to activin. ARIP2a could also interact with activin type II receptor as a novel member of ARIP family.

关键词： activin receptor-interacting protein tissue distribution.

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