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| | InterPro: IPR000936 Alphavirus E2 glycoprotein |
 | | Together the E1, E2, and sometimes E3 glycoprotein "spikes" form an E1/E2 dimer or an E1/E2/E3 trimer, where E2 extends from the centre to the vertices, E1 fills the space between the vertices, and E3, if present, is at the distal end of the spike [ 2, 3 ]. |
 | | Upon exposure of the virus to the acidity of the endosome, E1 dissociates from E2 to form an E1 homotrimer, which is necessary for the fusion step to drive the cellular and viral membranes together [ 4 ]. |
 | | The E2 glycoprotein functions to interact with the nucleocapsid through its cytoplasmic domain, while its ectodomain is responsible for binding a cellular receptor. |
| www.ebi.ac.uk /interpro/IEntry?ac=IPR000936 (3172 words) |
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