The 3D structure of the fusion primed Sendai F-protein determined by electron cryomicroscopy |
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Authors: | Ludwig Kai Baljinnyam Bolormaa Herrmann Andreas Böttcher Christoph |
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Affiliation: | Forschungszentrum für Elektronenmikroskopie, Freie Universit?t Berlin, Berlin, Germany. |
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Abstract: | The three dimensional (3D) structure of the ectodomain of the entire fusion mediating F protein from Sendai virus [MW (trimer) approximately 177 kDa] has been determined by cryoelectron microscopy of single molecules and subsequent 3D reconstruction at a resolution of approximately 16 A. The reconstruction, which has been obtained from the native, proteolytic processed fusion primed F1+F2 form, shows the protein protruding approximately 170 A out of the membrane in a homotrimeric association. It consists of a defined approximately 65 A wide distal head and an adjacent neck, which is connected to an 70 A elongated stalk. Although the overall shape appears to be similar to the recently reported X-ray structure of the Newcastle disease virus F protein, a closer comparison reveals structural differences suggesting that the investigated Sendai F structure represents an advanced state towards the fusion active conformation. |
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