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Chaperone-aided in vitro renaturation of an engineered E1 envelope protein for detection of anti-Rubella virus IgG antibodies

Title data

Scholz, Christian ; Thirault, Laurence ; Schaarschmidt, Peter ; Zarnt, Toralf ; Faatz, Elke ; Engel, Alfred M. ; Upmeier, Barbara ; Bollhagen, Ralf ; Eckert, Barbara ; Schmid, Franz X.:
Chaperone-aided in vitro renaturation of an engineered E1 envelope protein for detection of anti-Rubella virus IgG antibodies.
In: Biochemistry. Vol. 47 (8 April 2008) Issue 14 . - pp. 4276-4287.
ISSN 0006-2960
DOI: https://doi.org/10.1021/bi702435v

Abstract in another language

The envelope glycoproteins of Rubella virus, E1 and E2, mediate cell tropism, and E1 in particular plays a pivotal role in the fusion of the virus with the endosomal membrane. Both are the prime targets of the humoral immune response. Recombinant variants of the E1 ectodomain as well as E1 antigen preparations from virus lysates are commonly used to detect anti-Rubella immunoglobulins in human sera. Hitherto, recombinant E1 for diagnostic applications has been produced chiefly in eukaryotic expression systems. Here, we report the high-yield overproduction of an engineered E1 ectodomain in the Escherichia coli cytosol and its simple and convenient renaturation into a highly soluble and immunoreactive conformation. C-Terminal fusion to one or two units of the E. coli chaperone SlyD enhances expression, facilitates in vitro refolding, and improves the overall solubility of Rubella E1. As part of this fusion protein, the E1 ectodomain fragment of residues 201-432 adopts an immunoreactive fold, providing a promising tool for the sensitive and specific detection of anti-E1 IgG in Rubella serology. Two disulfide bonds in the membrane-adjacent part of the E1 ectodomain are sufficient to generate conformations with a high and specific antigenicity. The covalently attached chaperone modules do not impair antibody recognition and binding of Rubella E1 when assessed in a heterogeneous immunoassay. SlyD and related folding helpers are apparently generic tools for the expression and refolding of otherwise unavailable proteins of diagnostic or medical importance.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: PubMed-ID: 18330994
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Professorship Biochemistry - Univ.-Prof. Dr. Franz Xaver Schmid
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Biochemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 27 May 2015 06:46
Last Modified: 09 Mar 2016 14:50
URI: https://eref.uni-bayreuth.de/id/eprint/14330