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. 2018 Nov 12;294(1):157–167. doi: 10.1074/jbc.RA118.005041

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© 2019 Trindade et al.

Published under exclusive license by The American Society for Biochemistry and Molecular Biology, Inc.

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Figure 1. — Structural characterization of SIP. A, overall structure of SIP; B, close-up of the FAD pocket and stacking residues (Tyr-47, Tyr-75, and Tyr-245); C, putative NAD(P)H-binding pocket: comparison of the C-terminal helix of SIPs from S. frigidimarina (SfSIP) and S. putrefaciens (SpSIP). Lys-236 from SpSIP seems to make a bridge across the pocket, whereas Lys-257 in SfSIP is more distant from the isoalloxazine ring and pointing outwards from the pocket making more space available for substrate binding (ferric-siderophore and/or electron donors).