4FQ7:
reference: Structural and computational studies of the maleate isomerase from Pseudomonas putida S16 reveal a breathing motion wrapping the substrate inside., Chen D, Tang H, Lv Y, Zhang Z, Shen K, Lin K, Zhao YL, Wu G, Xu P, Mol Microbiol. 2013 Mar;87(6):1237-44. doi: 10.1111/mmi.12163. Epub 2013 Feb 13. PMID: 23347155

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