6QNZ:
reference: The key role of E418 carboxyl group in the formation of Nt.BspD6I nickase active site: Structural and functional properties of Nt.BspD6I E418A mutant., Artyukh RI, Kachalova GS, Yunusova AK, Fatkhullin BF, Atanasov BP, Perevyazova TA, Popov AN, Gabdulkhakov AG, Zheleznaya LA, J Struct Biol. 2020 Apr 13:107508. doi: 10.1016/j.jsb.2020.107508. PMID: 32298813

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