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The structure of the unliganded extracellular domain of the interleukin-6 signal transducer gp130 in solutionстатья
Информация о цитировании статьи получена из
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Дата последнего поиска статьи во внешних источниках: 3 декабря 2017 г.
- Авторы: Lorenzen Inken, Shang Weifeng, Perbandt Markus, Petoukhov Maxim V., Svergun Dmitri I., Waetzig Georg H., Rose-John Stefan, Hilgenfeld Rolf, Groetzinger Joachim
- Журнал: European Journal of Cell Biology
- Том: 90
- Номер: 6-7
- Год издания: 2011
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 515
- Последняя страница: 520
- DOI: 10.1016/j.ejcb.2010.09.012
- Аннотация: Interleukin-6 (IL-6) plays an important role in immune responses and signals via two different pathways. When IL-6 binds to its non-signalling membrane-bound receptor (IL-6R), a non-covalent dimer of the ubiquitous interleukin-6 signal transducer gp130 is recruited to initiate intracellular signalling cascades. This so-called classical signalling pathway is restricted to cells expressing the membrane-bound IL-6R, such as hepatocytes and certain leukocytes. In addition, an alternative trans-signalling pathway uses soluble forms of IL-6R (sIL-6R) in complex with IL-6 to activate cells expressing gp130, but not membrane-bound IL-6R. In both cases, a tetrameric or hexameric signalling complex consisting of two gp130 molecules and one or two molecules each of IL-6 and (s)IL-6R is formed. The structure of the hexameric complex of the ligand-binding domains of gp130 (D1-D3) with IL-6 and sIL-6R has been solved by X-ray crystallography as well as the full-length extracellular part of gp130 (D1-D6) as a monomer. Since gp130 exists as a preformed dimer on the cell surface, we used a sgp130Fc fusion protein - consisting of two extracellular gp130 regions (D1-D6) dimerised by an IgG1-Fc part - to study the structure of unliganded gp130 extracellular domains in solution by small-angle X-ray scattering (SAXS). The SAXS data indicated that sgp130Fc forms a rigid molecule in solution. The low resolution structural model reveals an elongated assembly with an Fc base and two gp130 arms, whereby the orientation of the ligand-binding domains D1-D3 with respect to the membrane-proximal domains D4-D6 differs from that in the crystallographic monomer. Functional implications of these findings are discussed. (C) 2010 Elsevier GmbH. All rights reserved.
- Добавил в систему: Петухов Максим Владимирович