Protein structural and free energy change analysis of VP7. The superimposed VP7 protein structure models of strain, RVA/Human-wt/ZAF/UFS-NGS-NICD18920/2017/G2P[4], representative of the current post-vaccine G2P[4] strains with that of an old G2 South African strain, RVA/Human/ZAF/SA405GR/87/1987/G2P[4]. The observed AA substitutions, A87T, D96N, I113T, N125T, V129M, S178N, N213D, N242S and I287V were shared by G2 strains in lineage IV, where all the South African G2 strains in this study clustered, in relation to the G2 strains in lineage I where a 1987 G2 strain RVA/Human/ZAF/SA405GR/87/1987/G2P[4] and also the prototype DS-1-like strain, RVA/Human-tc/USA/DS-1/1976/G2P[4], clustered. The free energy change difference after mutations was -1.592 kcal/mol. The structure of the pre-vaccine strain is in deep-teal while that of the post-vaccine strain is dark gray. The AA residues are represented in green and firebrick red to examine the structural conformation of the protein structure. The AA residues highlighted in firebrick red represents the pre-vaccine strain while that in green represents the post-vaccine strain.
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