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. Author manuscript; available in PMC: 2011 May 26.
Published in final edited form as: Biochemistry. 2007 Dec 11;47(1):92–100. doi: 10.1021/bi701859s

Figure 1.

Figure 1

Relative locations of the iron-sulfur cluster, the residues that were mutated, and the FAD based on the crystal structure of porcine ETF-QO (2GMH). The distance of closest approach between the cluster (Fe3) and the isoalloxazine ring (C8) of the FAD is 11.5 Å. Residues Y533 and T558 form hydrogen bonds to Sγ in C559 and C556, respectively.