5BXX:
reference: Biochemistry and Crystal Structure of Ectoine Synthase: A Metal-Containing Member of the Cupin Superfamily., Widderich N, Kobus S, Hoppner A, Riclea R, Seubert A, Dickschat JS, Heider J, Smits SH, Bremer E, PLoS One. 2016 Mar 17;11(3):e0151285. doi: 10.1371/journal.pone.0151285., eCollection 2016. PMID: 26986827

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