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. 2021 Sep 20;12:731845. doi: 10.3389/fimmu.2021.731845

Figure 5.

Figure 5

Schematic diagrams of SpA, SpG and PpL domain structures. (A) Left panel: Individual SpA domains including S (sorting peptide), Domains E-D-A-B-C, Region X and Region M. Right panel: SpA Domain C (PDB code: 4WWI) Each SpA immunoglobulin binding domains consists of 3 α-helices (red). (B) Left panel: Individual SpG domains including S (sorting peptide), Region E, Albumin Binding Domains A1-A2-A3, immunoglobulin binding domains B1-B2/C1-C2-C3 and Region W. Right panel: SpG Domain B1 (PDB code: 3GB1) Each SpG immunoglobulin binding domain consists of 1 α-helix (red) and 4 anti-parallel β-strands (yellow). (C) Left panel: Individual PpL domains including S (sorting peptide), Immunoglobulin Binding Domains B1-B2-B3-B4-B5/C1-C2-C3-C4, Albumin Binding Domains D1 to D4, Region W and M. Right panel: PpL Domain B1 (PDB code: 1HEZ). Each PpL immunoglobulin binding domain consists of 1 α-helix (red) and 4 anti-parallel β-strands (yellow).