1V7R:
reference: Structures of dimeric nonstandard nucleotide triphosphate pyrophosphatase from Pyrococcus horikoshii OT3: functional significance of interprotomer conformational changes., Lokanath NK, Pampa KJ, Takio K, Kunishima N, J Mol Biol. 2008 Jan 25;375(4):1013-25. Epub 2007 Nov 13. PMID: 18062990

This OCA Structure page
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