Table 2. PISA analysis of the XacGST model (PDB entry 6nv6, chains A and B).

	Chain A	Chain B
Dimeric interface	Leu63, Val64, Leu65, Trp66, Glu67, Asn69, Ala70, Arg73, Tyr74, Ala77, Gln78, Tyr84, Gln86, Pro88, Ala89, Arg91, Ala92, Leu93, Asp95, Arg96, Trp97, Asn99, Trp100, Thr101, Thr102, Ser103, Thr104, Arg142, Ala145	Pro51, Asn52, Leu63, Val64, Leu65, Trp66, Glu67, Asn69, Ala70, Arg73, Tyr74, Ala77, Gln78, Tyr84, Gln86, Pro88, Ala89, Arg91, Ala92, Leu93, Asp95, Arg96, Asp99, Trp100, Thr102, Ser103, Thr104
Inaccessible residues buried in the interior of the protein structure	Ala18, Trp20, Cys21, Pro56, Leu58, Ile71, Val72, Leu75, Ala76, Met98, Thr101, Phe105, Ser136, Leu140, Ala143, Asp162, Ile163, Pro164, Gly166, Ser167, Ile169, Leu185, Trp188, Tyr198, Val202	Arg16, Ala18, Trp20, Cys21, Ala22, Asn50, Thr57, Leu58, Ile71, Val72, Leu75, Ala76, Met98, Phe105, Leu112, Ser136, Leu140, Ala143, Asp162, Ile163, Pro164, Leu165, Gly166, Ser167, Ile169, Ala171, Leu185, Trp188, Leu192, Tyr198, Val202
Salt bridges	Arg73A–Asp95B, Arg73A–Asp99B, Aps95A–Arg73B, Asp99A–Arg73B	Asp95B–Arg73A, Asp99B–Arg73A, Arg73B–Asp95A, Arg73B–Asp99A
Hydrogen bonds	Val64A–Arg96B, Glu67A–Ser103B, Ala70A–Asp99B, Arg73A–Asp95B, Arg73A–Asp99B, Tyr84A–Tyr84B, Arg91A–Tyr84B, Asp95A–Arg73B, Arg96A–Val64B, Asp99A–Arg73B, Trp100A–Asn52B, Ser103A–Glu67B, Arg142A–Asn52B	Arg96B–Val64A, Ser103B–Glu67A, Asp99B–Ala70A, Asp95B–Arg73A, Asp99B–Arg73A, Tyr84B–Tyr84A, Tyr84B–Arg91A, Arg73B–Asp95A, Val64B–Arg96A, Arg73B–Asp99A, Asn52B–Trp100A, Glu67B–Ser103A, Asn52B–Arg142A