research papers 8 https://doi.org/10.1107/S2059798318014948 Acta Cryst. (2019). D75, 8–15 Received 11 July 2018 Accepted 22 October 2018 Edited by R. McKenna, University of Florida, USA ‡ These authors contributed equally. Keywords: nucleoproteins; Middle East respiratory syndrome coronavirus; MERS-CoV; Coronaviridae; X-ray diffraction; SAXS. PDB reference: C-terminal domain of MERS-CoV nucleocapsid, 6g13 Supporting information: this article has supporting information at journals.iucr.org/d Structure and oligomerization state of the C-terminal region of the Middle East respiratory syndrome coronavirus nucleoprotein Thi Hong Van Nguyen,a,b Julie Lichie`re,a,b Bruno Canard,a,b Nicolas Papageorgiou,a,b Sarah Attoumani,a,b Franc¸ois Ferrona,b*‡ and Bruno Coutarda,b*‡ aAix-Marseille Universite´, AFMB UMR 7257, 13288 Marseilles, France, and bCNRS, AFMB UMR 7257, 13288 Marseilles, France. *Correspondence e-mail: