Figure 6 | Scientific Reports

Figure 6

From: Transcriptional response to prolonged perchlorate exposure in the methanogen Methanosarcina barkeri and implications for Martian habitability

Figure 6

Proposed models of Mo- and H2-dependent perchlorate reduction occurring (a) in direct competition with hydrogenotrophic methanogenesis, and (b) via the energy-conserving partial reversal of methylamine-based methanogenesis. Abbreviations: Non-specific, common to multiple pathways; MF, methanofuran; CHO-MF, formyl-methanofuran; H4SPT, tetrahydrosarcinapterin; CHO-H4SPT, formyl-tetrahydrosarcinapterin; CH≡H4SPT, methenyl-tetrahydrosarcinapterin; CH2 = H4SPT, methylene-tetrahydrosarcinapterin; CH3-H4SPT, methyl-tetrahydrosarcinapterin; CoM-SH, coenzyme M; CoB-SH, coenzyme B; CoB-S–S-CoM, CoB-CoM heterodisulphide; CH3-S-CoM, methyl-coenzyme M; CH3-R, methylamine; MP, methanophenazine; Fd, ferredoxin; F420, coenzyme F420; (Mo)-Fmd, (Mo)-formylmethanofuran dehydrogenase; (Mo)-Nase, (Mo)-nitrogenase.

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