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生产稳定和纯的ZC3H11A - 一种广泛无序的RNA结合蛋白

Mostafa Fekry¹, Gun Stenberg², Doreen Dobritzsch²

¹Department of Chemistry - BMC, Uppsala University, Uppsala, Sweden; Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt.

Protein expression and purification

|July 5, 2024

概括

研究人员成功地利用昆虫细胞和性缓冲器生产出纯净,稳定的全长人体ZC3H11A蛋白,这是一种对病毒复制至关重要的RNA结合因子. 这一突破使得这一重要蛋白质的进一步生化表征成为可能.

科学领域:

生物化学生物化学
分子生物学分子生物学
病毒学病毒学

背景情况:

人类ZC3H11A是一种必不可少的RNA结合蛋白,用于mRNA输出和病毒复制.
它的生物化学性质在很大程度上仍未被鉴定,这是由于生产面临的挑战.
蛋白质很大,只有N端域结构良好,其余部分本质上是无序的.

研究的目的:

为了生产纯净和稳定的全身人体ZC3H11A,用于生物化学表征.
为了克服与蛋白质大小,无序性质和潜在聚合相关的挑战.

主要方法:

在各种系统 (例如,昆虫细胞,大肠杆菌) 中,ZC3H11A全长,截断和突变变异的重组表达.
探索不同的净化标签,融合蛋白,伴侣和缓冲条件.
位点定向突变发生 (Cys8到Ala/Ser) 以减少核酸污染并评估蛋白质的稳定性.

主要成果:

最初,只有截断的ZC3H11A在昆虫细胞中稳定地产生;大肠杆菌的表达导致聚合.
突变Cys8稳定了全长ZC3H11A,而不影响核酸结合.
使用性缓冲剂 (pH9) 的净化产生了稳定,>90%的纯全长ZC3H11A在各种寡合体状态.

结论:

使用昆虫细胞和性缓冲器净化,可以生产稳定,全身的人类ZC3H11A.
蛋白质的稳定性和寡合体状态受缓冲 pH 和特定突变的影响.
这些发现有助于对ZC3H11A的生物化学表征,进步对mRNA出口和病毒复制机制的理解.

关键词:

昆虫细胞的表达方式在RNA结合蛋白质中的RNA结合蛋白.在 ZC3H11A 中.手指的指是什么意思在mRNA出口方面,mRNA出口是非常重要的.

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