Pre-glycoprotein polyprotein GP complex

UniProtKB accession:  P08669

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UniProtKB description:  Functions as a cleaved signal peptide that is retained as the third component of the GP complex (GP-C) (PubMed:35173332). Helps to stabilize the spike complex in its native conformation (PubMed:35173332). The SSP is required for efficient glycoprotein expression, post-translational maturation cleavage of G1 and G2, glycoprotein transport to the cell surface plasma membrane, formation of infectious virus particles, and acid pH-dependent glycoprotein-mediated cell fusion (PubMed:14555961).