5XT6:
reference: Zinc-Ligand Swapping Mediated Complex Formation and Sulfur Transfer between SufS and SufU for Iron-Sulfur Cluster Biogenesis in Bacillus subtilis., Fujishiro T, Terahata T, Kunichika K, Yokoyama N, Maruyama C, Asai K, Takahashi Y, J Am Chem Soc. 2017 Dec 13. doi: 10.1021/jacs.7b11307. PMID: 29235855

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