6YUC:
reference: Molecular basis for the bifunctional Uba4-Urm1 sulfur-relay system in tRNA thiolation and ubiquitin-like conjugation., Pabis M, Termathe M, Ravichandran KE, Kienast SD, Krutyholowa R, Sokolowski M, Jankowska U, Grudnik P, Leidel SA, Glatt S, EMBO J. 2020 Sep 9:e105087. doi: 10.15252/embj.2020105087. PMID: 32901956

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