sp|P11558|MCRA_METTM Methyl-coenzyme M reductase I subunit alpha OS=Methanothermobacter marburgensis (strain ATCC BAA-927 / DSM 2133 / JCM 14651 / NBRC 100331 / OCM 82 / Marburg) OX=79929 GN=mcrA PE=1 SV=3