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Production of stable and pure ZC3H11A-An extensively disordered RNA binding protein
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Biochemistry. Cairo Univ, Fac Sci, Biophys Dept, Giza, Egypt..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Biochemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Biochemistry.ORCID iD: 0000-0002-1822-6513
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Biochemistry. Uppsala University, Science for Life Laboratory, SciLifeLab.ORCID iD: 0000-0003-2728-0340
2024 (English)In: Protein Expression and Purification, ISSN 1046-5928, E-ISSN 1096-0279, Vol. 222, article id 106542Article in journal (Refereed) Published
Abstract [en]

Human ZC3H11A is an RNA-binding zinc finger protein involved in mRNA export and required for the efficient growth of human nuclear replicating viruses. Its biochemical properties are largely unknown so our goal has been to produce the protein in a pure and stable form suitable for its characterization. This has been challenging since the protein is large (810 amino acids) and with only the N-terminal zinc finger domain (amino acids 1-86) being well structured, the remainder is intrinsically disordered. Our production strategies have encompassed recombinant expression of full-length, truncated and mutated ZC3H11A variants with varying purification tags and fusion proteins in several expression systems, with or without co-expression of chaperones and putative interaction partners. A range of purification schemes have been explored. Initially, only truncated ZC3H11A encompassing the zinc finger domain could successfully be produced in a stable form. It required recombinant expression in insect cells since expression in E. coli gave a protein that aggregated. To reduce problematic nucleic acid contaminations, Cys8, located in one of the zinc fingers, was substituted by Ala and Ser. Interestingly, this did not affect nucleic acid binding, but the full-length protein was stabilised while the truncated version was insoluble. Ultimately, we discovered that when using alkaline buffers (pH 9) for purification, full-length ZC3H11A expressed in Sf9 insect cells was obtained in a stable and >90 % pure form, and as a mixture of monomers, dimers, tetramers and hexamers. Many of the challenges experienced are consistent with its predicted structure and unusual charge distribution.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 222, article id 106542
Keywords [en]
Zinc finger, RNA binding proteins, Insect cell expression, mRNA export, ZC3H11A
National Category
Biochemistry Molecular Biology
Identifiers
URN: urn:nbn:se:uu:diva-535387DOI: 10.1016/j.pep.2024.106542ISI: 001266753100001PubMedID: 38969281OAI: oai:DiVA.org:uu-535387DiVA, id: diva2:1886352
Funder
Knut and Alice Wallenberg Foundation, 2017.0071Available from: 2024-07-31 Created: 2024-07-31 Last updated: 2025-02-20Bibliographically approved

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Fekry, MostafaStenberg, GunDobritzsch, DoreenDanielson, U. Helena

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