目的 蛋白酶体激活因子11S调节蛋白复合物γ亚单位(11S regulator complex gamma subunit,REGγ)的重组表达,初步探讨其与骨形成负调控分子酪蛋白激酶-2相互作用蛋白-1(casein kinase-2 interacting protein-1,CKIP-1)的相互作用.方法 首先以质粒pCMV-Myc-REGγ为模板,通过聚合酶链反应(PCR)扩增出765 bp的REGγ cDNA片段,然后亚克隆到原核表达载体pGEX-4T-2并转化入大肠杆菌BL21经IPTG诱导表达,表达产物超声破碎后进行SDS-PAGE和Western印迹鉴定,进而通过GST Pull-down实验验证REGγ是否与CKIP-1存在相互作用.结果 通过测序证实原核表达载体pGEX-4T-2-REGγ构建成功,进一步表达鉴定发现GST-REGγ蛋白主要以可溶性的形式存在于裂解上清中;GST Pull-down实验表明REGγ与CKIP-1存在明显的相互作用.结论 REGγ与CKIP-1在体外存在相互作用,为进一步深入研究REGγ对CKIP-1的调控作用奠定了基础.“,”Objective To study the expression of the fused proteasome activator REGγ(11S regulator complex gamma subunit) using gene recombination technology and to further study the interaction between REGγ and casein kinase-2 interacting protein-1(CKIP-1)in vitro.Methods Firstly, the full length cDNA fragment of REGγ was amplified through PCR using the plasmid pCMV-Myc-REGγ as template and subcloned into the prokaryotic expression vector pGEX-4T-2 before being transformed into E.coli BL21 cells. The protein expression was induced by isopropyl-β-D-thiogalactoside(IPTG) .Secondly, the protein expression was monitored by SDS-PAGE and Western blotting after ultrasonication. Finally, the GST Pull-down assay was performed to investigate the interaction between REGγ and CKIP-1 in vitro.Results The prokaryotic expression construct pGEX-4T-2-REGγ was generated successfully and confirmed by DNA sequencing. Expression analysis showed that the GST-REGγ protein was easily expressed and isolated mainly in the lysate supernatant after sonication and centrifugation. The GST Pull-down assay revealed the strong mutual interaction between REGγ and CKIP-1 in vitro.Conclusion The proteasome activator REGγ could interact with the negative regulator of osteoblastogenesis CKIP-1 in vitro and the current study has shed light on further investigations of their physiological relevance.