Table 3. Sequences associated with specific functions and taxa within the sulfur cycle using KEGG pathways.

Number of reads assigned	E.C Number	Orthology KEGG	Enzyme name	Gene	Organism	Class	E-value e
8	2.3.1.30	K00640	serine O-acetyltransferase	cysE	Gemmata obscuriglobus	Planctomycetacia	6 e–36
					Bryantella formatexigens	Clostridia	1 e–32
37	2.7.7.4	K00956	sulfate adenylyltransferase subunit 1	cysN	Laribacter hongkongensis	Betaproteobacteria	2 e–15
					Stigmatella aurantiaca	Deltaproteobacteria	6 e–11
					Bacterium Ellin514	Verrucomicrobiae	3 e–11
		K00957	sulfate adenylyltransferase subunit 2	cysD	Clostridium cellulovorans	Clostridia	2 e–24
					Uncultured Archeon	Archaea	2 e–18
					Rhodomicrobium vannielii	Alphaproteobacteria	4 e–10
					Opitutaceae bacterium	Opitutae	6 e–20
					Marinobacter aquaeolei	Gammaproteobacteria	2 e–19
					Clostridium cellulovorans	Clostridia	7 e–16
		K00958	sulfate adenylyltransferase	cysDN	Leptospirillum ferrodiazotrophum	Nitrosospira	1 e–75
					Micromonas pusilla a	Prasinophyceae	2 e–21
					Planctomyces maris	Planctomycetacia	4 e–29
					Thialkalivibrio sp.	Gammaproteobacteria	5 e–26
					Rhodothermus marinus	Sphingobacteria	5 e–23
					Silicibacter lacuscaerulensis	Alphaproteobacteria	2 e–17
					Syntrophobacter fumaroxidans	Deltaproteobacteria	2 e–18
					Thiobacilllus denitrificans	Betaproteobacteria	6 e–15
		K00955	bifunctional enzyme CysN/CysC	cysNC	Acidiphilium cryptum	Alphaproteobacteria	7 e–72
					Xenorhabdus nematophila	Gammaproteobacteria	6 e–41
8	1.8.3.1	K00387	sulfite oxidase *	X	Phaeodactylum tricornutum b	Bacillariophyceae	1 e–14
					Nematostella vectensis c	Anthozoa	8 e–15
9	1.8.99.2	K00395	adenylylsulfate reductase, subunit B	aprB	Thiobacillus aquaesulis	Betaproteobacteria	3 e–32
					Thermodesulfovibrio yellowstonii	Nitrosospira	5 e–45
		K00394	adenylylsulfate reductase, subunit A	aprA	Thiobacilllus denitrificans	Betaproteobacteria	9 e–24
					Desulfirivibrio alkaliphilus	Deltaproteobacteria	3 e–14
					Thiobacilllus denitrificans	Betaproteobacteria	2 e–22
13	2.7.1.25	K00955	bifunctional enzyme CysN/CysC	cysNC	Acidiphilium cryptum	Alphaproteobacteria	7 e–72
					Xenorhabdus nematophila	Gammaproteobacteria	6 e–41
		K00860	adenylylsulfate kinase	cysC	Geobacter sp.	Deltaproteobacteria	7 e–15
					Burkholderia sp.	Betaproteobacteria	3 e–15
					Chloroflexus sp.	Chloroflexi	8 e–22
					Chlamydomonas reinhardtii a	Chlorophyceae	1 e–24
							4 e–33
							1 e–32
23	2.5.1.47	K12339	cysteine synthase B	cysM	Thioalkalivibrio sp.	Gammaproteobacteria	5 e–16
					Streptomyces clavuligerus	Actinobacteria	4 e–24
		K01738	cysteine synthase A	cysK	Desulfirivibrio alkaliphilus	Deltaproteobacteria	3 e–12
					Chlamydomonas reinhardtii a	Chlorophyceae	2 e–13
					Thalassiosira pseudonana b	Coscinodiscophyceae	5 e–16
					Gemmata obscuriglobus	Planctomycetacia	3 e–12
					Chlamydomonas reinhardtii a	Cholorophyceae	5 e–22
					Polytomella parva a	Cholorophyceae	1 e–15
					Symbiobacterium thermophilum	Clostridia	2 e–15
							2 e–15
4	1.8.4.8	K00390	phosphoadenosine phosphosulfate reductase	cysH	Acidobacterium capsulatum	Acidobacteria	4 e–22
10	1.8.1.2	K00381	sulfite reductase (NADPH) hemoprotein beta-component	cysI	Haliangium achraceum	Deltaproteobacteria	2 e–24
					Azoarcus sp.	Betaproteobacteria	5 e–30
					Citomicrobium bathyomarinum	Alphaproteobacteria	1 e–32
		K00380	sulfite reductase (NADPH) flavoprotein alpha-component	cysJ	Chlamydomonas reinhardtii a	Chlorophyceae	1 e–17
3	1.8.7.1	K00392	sulfite reductase (ferredoxin)	sir	Physcomitrella patens d	Embryophyta	1 e–13
					Micromonas pusilla a	Prasinophyceae	2 e–12

^*sulfur oxidation; ^a micro-algae; ^b diatom; ^c sea anemone; ^d moss; ^e (cut-off E-value 1e -10).