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. 2009 Apr 22;284(26):17835–17845. doi: 10.1074/jbc.M109.011502

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© 2009 by The American Society for Biochemistry and Molecular Biology, Inc.

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FIGURE 6. — Comparison of the complexes of substrate-DsbA and DsbB-DsbA (Protein Data Bank code 2HI7). a, surface view of the interaction between EcDsbA and SigA peptide. The surface of EcDsbA is shown with the SigA peptide in an orange stick representation. The position of His³² on the surface is highlighted in magenta. b, structure of the DsbA-DsbB complex. The surface of EcDsbA is shown with the bound Cys¹⁰⁴ loop in a green stick representation, and the position of His³² is highlighted. c, superposition of the two complexes reveals that His³² in the complex with SigA peptide (magenta) adopts a different rotameric state compared with that observed in the complex with DsbB.