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. 2009 Dec 3;285(6):4173–4184. doi: 10.1074/jbc.M109.080937

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FIGURE 4. — The IIA^Chb*(H89E)-IIB^Chb(C10S) interface. A, stereoview of the interface between the A subunit of IIA^Chb*(H89E) and IIB^Chb(C10S) with the respective backbones shown as transparent blue and red ribbons, respectively. B, stereoview of the interface between the C subunit of IIA^Chb*(H89E) and IIB^Chb(C10S) with the respective backbones shown as transparent green and red ribbons, respectively. The dashed lines indicate intermolecular hydrogen bonds or salt bridges. The side chain atoms are colored according to atom type; carbon, gray; nitrogen, blue; oxygen, red. Residues of IIB^Chb(C10S) are labeled in italics. C, diagrammatic representation of the intermolecular contacts between the A and C subunits of IIA^Chb*(H89E) and IIB^Chb(C10S). Residues involved in side chain-side chain electrostatic interactions are colored in blue (donor) or red (acceptor). Ile-72 of the C subunit of IIA^Chb*(H89E) is colored in orange because its backbone carbonyl accepts a hydrogen bond from Ser-17 of IIB^Chb(C10S). The active site residues, H89E of IIA^Chb*(H89E), and C10S of IIB^Chb(C10S) are colored purple.