1HBO:
reference: On the mechanism of biological methane formation: structural evidence for conformational changes in methyl-coenzyme M reductase upon substrate binding., Grabarse W, Mahlert F, Duin EC, Goubeaud M, Shima S, Thauer RK, Lamzin V, Ermler U, J Mol Biol 2001 May 25;309(1):315-30. PMID: 11491299

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