1WY5:
reference: Structural basis for lysidine formation by ATP pyrophosphatase accompanied by a lysine-specific loop and a tRNA-recognition domain., Nakanishi K, Fukai S, Ikeuchi Y, Soma A, Sekine Y, Suzuki T, Nureki O, Proc Natl Acad Sci U S A 2005 May 24;102(21):7487-92. Epub 2005 May 13. PMID: 15894617

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