sp|Q58261|MTRA_METJA Tetrahydromethanopterin S-methyltransferase subunit A OS=Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440) OX=243232 GN=mtrA PE=1 SV=2