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CLN3编码蛋白Battenin的N-端是与蛋白结合的功能域
Objective: Batten disease (BD), the juvenile form of neuronal ceroid lipofuscinosis (NCLs), is pathological characterized by finding lysosomal storage of autofluorescent lipofuscins with unique ultrastructural profiles. The gene underlying BD is designated CLN3 and encodes a protein, Battenin, of unknown function that localizes in lysosomes and/or mitochondria. Previously, we hypothesized that Battenin associates with other membrane protein(s) to form a membrane complex. Dysfunction of this complex could result in the pathological changes of BD, and possibly in other NCLs. Two such membranous proteins, the slow and fast Battenin-interactive proteins (BIPs and BIPf) of unknown functions, have been identified. In this study, we have characterized the functional domains of Battenin that interact with both BIP proteins. Methods: Protein-protein interactions with a yeast two-hybrid system were employed. A "deletion assay" was employed to localize the interactive segment(s). Different lengths of cDNA sequences lacking exon 1-5 were used to express CLN3-encoded proteins lacking N-terminal segments in the yeast two-hybrid system. N-terminal exons of CLN3 were deleted with PCR-cloning strategies.Results: We eliminated the possibility of interacting domains from the exon 7-encoded region because both Battenin and mBattenin interact with the BIP proteins. We have shown that peptide sequences encoded by exons 2 and 4 of CLN3 gene include the functional domains by which Battenin interacts with the BIP proteins. Conclusion: Our studies provide evidence that the N-terminus of Battenin is the functional domain for these protein interactions.
关键词： 神经元蜡样质脂褐质沉积病 基因 CLN3 蛋白质相互作用 -
稳定过表达CLN3的SY5Y细胞增殖功能加强
目的 建立稳定表达CLN3(ceroid-lipofuscinosis,neuronal 3)和CLN3 1.02 kb缺失突变体基因(CLN3Δex7/8)的稳定细胞系,研究全长CLN3在人神经母细胞瘤(SH-SY5Y)细胞中的促增殖作用及7、8号外显子缺失突变体对细胞增殖的影响.方法 利用药物Zeocin筛选构建稳定过表达CLN3全长基因和CLN 3Δex7/8的SH-SY5Y细胞系,用RT-PCR,Real Time PCR和Western印迹检测CLN3全长及截短基因(CLN 3Δex7/8)的表达,并用Cell Counting Kit-8(CCK8)检测细胞增殖,比较两种细胞系对SH-SY5Y的增殖的影响.结果 成功构建了稳定过表达CLN3全长基因细胞系SH-SY5Y/C和CLN3Δex7/8的细胞系SH-SY5Y/Ct,mRNA水平分别过表达43倍和124倍,蛋白水平分别过表达1.5倍和20倍.过表达CLN3全长基因与空质粒对照组相比,增殖速率明显提高(P=0.044 527),差异有统计学意义,而过表达CLN 3Δex7/8的空质粒对照组相比,增殖速率无差别(P =0.345 329),差异无统计学意义.CLN3Δex7/8对细胞的增殖没有明显促增殖作用.结论 CLN3全长基因对细胞增殖具有明显促进作用,而过表达CLN 3Δex7/8对细胞的增殖没有明显影响,结果提示CLN3基因的7、8号外显子是调控细胞增殖的关键区域.
关键词： SH-SY5Y细胞 CLN3 CLN 3Δex7/8 细胞系构建 增殖 -
CLN3基因与疾病研究进展
CLN3基因的编码产物是一种凋亡抑制膜蛋白,在正常组织及细胞中CLN3呈低表达状态;Batten病是由于CLN3发生1kg的基因缺失突变引发的;在多种肿瘤中均发现CLN3基因过表达;反义CLN3能封闭某些肿瘤细胞CLN3基因表达,起抗肿瘤作用.CLN3可能通过调节神经酰胺的合成,也可能通过调节下游基因的表达调节细胞凋亡过程,与肿瘤的发生、发展及治疗有着密切关系.
