5CAX:
reference: Structural and Biochemical Characterizations of Methanoredoxin from Methanosarcina acetivorans, a Glutaredoxin-Like Enzyme with Coenzyme M-Dependent Protein Disulfide Reductase Activity., Yenugudhati D, Prakash D, Kumar AK, Kumar RS, Yennawar NH, Yennawar HP, Ferry JG, Biochemistry. 2016 Jan 19;55(2):313-21. doi: 10.1021/acs.biochem.5b00823. Epub, 2015 Dec 30. PMID: 26684934

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