2bez: Difference between revisions

A coronavirus (CoV) has recently been identified as the causative agent of, the severe acute respiratory syndrome (SARS) in humans. CoVs enter target, cells through fusion of viral and cellular membranes mediated by the viral, envelope glycoprotein S. We have determined by x-ray crystallography the, structure of a proteolytically stable core fragment from the heptad repeat, (HR) regions HR1 and HR2 of the SARS-CoV S protein. We have also, determined the structure of an HR1-HR2 S core fragment, containing a, shorter HR1 peptide and a C-terminally longer HR2 peptide that extends up, to the transmembrane region. In these structures, three HR1 helices form a, parallel coiled-coil trimer, whereas three HR2 peptides pack in an oblique, and antiparallel fashion into the coiled-coil hydrophobic grooves, adopting mixed extended and alpha-helical conformations as in postfusion, paramyxoviruses F proteins structures. Our structure positions a, previously proposed internal fusion peptide adjacent to the N-terminus of, HR1. Peptides from the HR2 region of SARS-CoV S have been shown to inhibit, viral entry and infection in vitro. The structures presented here can thus, open the path to the design of small-molecule inhibitors of viral entry, and candidate vaccine antigens against this virus.

2BEZ is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Human_sars_coronavirus Human sars coronavirus] with GOL as [http://en.wikipedia.org/wiki/ligand ligand]. Structure known Active Site: AC1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2BEZ OCA].  

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