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. 2010 May 5;98(9):1949–1956. doi: 10.1016/j.bpj.2010.01.007

Figure 1.

Figure 1

X-ray structures of the BLUF domain of AppA for the (A) WT and (B) C20S mutant. The vicinity of the FAD chromophore and two tryptophan residues is highlighted with the hydrogen-bond patterns lining the FAD binding pocket. The coordinates were taken from Protein Data Bank ID (A) 1YRX (14) and (B) 2IYG (17). Panels C and D show the structure and numbering of the FAD isoalloxazine ring and tryptophan residue, respectively.