3IER:
reference: Molecular basis for the high-affinity binding and stabilization of firefly luciferase by PTC124., Auld DS, Lovell S, Thorne N, Lea WA, Maloney DJ, Shen M, Rai G, Battaile KP, Thomas CJ, Simeonov A, Hanzlik RP, Inglese J, Proc Natl Acad Sci U S A. 2010 Mar 16;107(11):4878-83. Epub 2010 Mar 1. PMID: 20194791

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