FIG 1.

Heterodisulfide reductase, hydrogenase, and formate dehydrogenase genes in M. thermophilus. The genome organizations of genes encoding heterodisulfide reductase (Hdr) (WP_066957203 to WP_066957207) and formylmethanofuran dehydrogenase (Fwd) (WP_066957199 to WP_066957217) (A) are distinct from those of cytoplasmic hydrogenases, F₄₂₀-nonreducing hydrogenase (Mvh) (WP_066954307 to WP_066954310) (B), F₄₂₀-reducing hydrogenase (Frh) (WP_066956025 to WP_066956925) (C), and formate dehydrogenases (Fdh) Fdh1 (WP_066953711 to WP_066953708), Fdh2 (WP_066958300 to WP_066958302), and Fdh3 (WP_066958856 to WP_066958857) (D). The scale bar represents 2 kbp.