Download MendeleyStructure of the S1 subunit C-terminal domain from bat-derived coronavirus HKU5 spike protein
Han, X., Qi, J., Song, H., Wang, Q., Zhang, Y., Wu, Y., Lu, G., Yuen, K.Y., Shi, Y., Gao, G.F.(2017) Virology 507: 101-109
- PubMed: 28432925
- DOI: https://doi.org/10.1016/j.virol.2017.04.016
- Primary Citation of Related Structures:
5XGR - PubMed Abstract:
Accumulating evidence indicates that MERS-CoV originated from bat coronaviruses (BatCoVs). Previously, we demonstrated that both MERS-CoV and BatCoV HKU4 use CD26 as a receptor, but how the BatCoVs evolved to bind CD26 is an intriguing question. Here, we solved the crystal structure of the S1 subunit C-terminal domain of HKU5 (HKU5-CTD), another BatCoV that is phylogenetically related to MERS-CoV but cannot bind to CD26. We observed that the conserved core subdomain and those of other betacoronaviruses (betaCoVs) have a similar topology of the external subdomain, indicating the same ancestor of lineage C betaCoVs. However, two deletions in two respective loops located in HKU5-CTD result in conformational variations in CD26-binding interface and are responsible for the non-binding of HKU5-CTD to CD26. Combined with sequence variation in the HKU5-CTD receptor binding interface, we propose the necessity for surveilling the mutation in BatCoV HKU5 spike protein in case of bat-to-human interspecies transmission.
Organizational Affiliation:
CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
