Table 3.

Enzymes, reactions and occurrence of orthologous genes involved in elemental sulfur and thiosulfate respiration in Desulfurellaceae family.

Enzyme	Reaction	Occurrence of orthologous genes
		Subunits	Dam	Dac	Hma	Hja	Hal	Hme
		PsrA	–	–	0433	1370	0846	0560
Polysulfide reductase	${\mathit{S}}_{\mathrm{n}}^{\mathrm{2}\mathrm{-}}\mathrm{\to }{\mathit{S}}^{\mathrm{2}\mathrm{-}}\mathrm{+}{\mathit{S}}_{\mathrm{n}\mathrm{-}\mathrm{1}}^{\mathrm{2}\mathrm{-}}$	PsrB	–	–	0434	1371	0847	0561
		PsrC	–	–	0435	1372	0848	0562
2*Sulfide dehydrogenase∗	${\mathit{S}}_{\mathrm{n}}^{\mathrm{2}\mathrm{-}}\mathrm{\to }{\mathit{S}}^{\mathrm{2}\mathrm{-}}\mathrm{+}{\mathit{S}}_{\mathrm{n}\mathrm{-}\mathrm{1}}^{\mathrm{2}\mathrm{-}}$	SudhA	1853	0076	0231	1601	1361	1618
		SudhB	1852	0075	0230	1600	1360	1617
		SreA	1359	–	–	–	–	–
		SreB	1357	–	–	–	–	–
Sulfur reductase	S0 → S2-	SreC	1358	–	–	–	–	–
		SreD	1360	–	–	–	–	–
		SreE	1361	–	–	–	–	–
		PhsA	9	1254	0433	1171	1675	0227
Thiosulfate reductase	${\mathit{S}}_{\mathrm{2}}{\mathit{O}}_{\mathrm{3}}^{\mathrm{2}\mathrm{-}}\mathrm{\to }{\mathit{S}}^{\mathrm{2}\mathrm{-}}\mathrm{+}{\mathit{S}\mathit{O}}_{\mathrm{3}}^{\mathrm{2}\mathrm{-}}$	PhsB	8	1253	–	–	–	–
		PhsC	10	1255	–	1172	1676	0228
2*Sulfite reductase		DsrA	1435	1402	–	–	–	–
		DsrB	1434	1401	–	–	–	–
DsrC	${\mathit{S}\mathit{O}}_{\mathrm{3}}^{\mathrm{2}\mathrm{-}}\mathrm{\to }{\mathit{S}}^{\mathrm{2}\mathrm{-}}$	DsrC	1431, 2056	–	–	–	–	–
2*Complex Dsr MK		DsrM	1430	–	–	–	–	–
		DsrK	1429	–	–	–	–	–

Dam, D. amilsii; Dac, D. acetivorans; Hma, H. maritima; Hja, H. Jasoniae; Hal, H. alviniae; Hme, H. medeae. The prefix of the locus tags for the analyzed species are DESAMIL20_ (D. amilsii); Desace_ (D. acetivorans); Hipma_ (H. maritima); EK17DRAFT_ (H. jasoniae); G415DRAFT_ (H. alviniae) and D891DRAFT_(H. medeae). To avoid repetition of the prefix in the table, all the locus tags are represented only by the specific identifier. ^∗Possibly functioning as bifurcating/confurcating enzyme.