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. 2017 Apr 18;292(23):9652–9665. doi: 10.1074/jbc.M117.786855

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© 2017 by The American Society for Biochemistry and Molecular Biology, Inc.

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Figure 6. — Unexpected FAD conformation. A, 2.7 Å resolution electron density for the FAD in CfPutA. The cage represents a simulated annealing σ_A-weighted F_o − F_c omit map (3.0σ). The inset shows an edge-on view of the isoalloxazine ring. B, superposition of the FAD in CfPutA (yellow) and the 2-electron-reduced FAD in GsPutA (gray). The inset shows an edge-on view of the isoalloxazine ring. Note that the two FADs have the same ribityl conformation but different butterfly bend angles. C, a typical oxidized PutA FAD (from GsPutA). Note that the ribityl conformation differs from that in B.