4AY7:
reference: Structure of the corrinoid:coenzyme M methyltransferase MtaA from Methanosarcina mazei., Hoeppner A, Thomas F, Rueppel A, Hensel R, Blankenfeldt W, Bayer P, Faust A, Acta Crystallogr D Biol Crystallogr. 2012 Nov;68(Pt 11):1549-57. doi:, 10.1107/S090744491203853X. Epub 2012 Oct 18. PMID: 23090404

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