2PKO:
reference: The sulfurtransferase activity of Uba4 presents a link between ubiquitin-like protein conjugation and activation of sulfur carrier proteins., Schmitz J, Chowdhury MM, Hanzelmann P, Nimtz M, Lee EY, Schindelin H, Leimkuhler S, Biochemistry. 2008 Jun 17;47(24):6479-89. Epub 2008 May 21. PMID: 18491921

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