Table 5.

Presence of oxygen-scavenging mechanisms within the three enrichment cultures

	Presence			Taxonomic Classification
	D	A	K	DonnaII	ANAS	KB-1
Direct O2removal
Glycolate oxidase	-	+	-		Cya
Cytochrome c oxidase	+	+	+	Act, β-P*, Cya*, δ-P*, ϵ-P*, Firm*	γ-P*	δ-P, ϵ-P*
Cytochrome d ubiquinol oxidase	+	+	+	Act*, BC, δ-P*, ϵ-P*, Firm	BC, δ-P	δ-P, Firm
Ferroxidase	+	-	-	Firm
Radical O2species
Catalase	+	+	+	Act, BC, β-P, DT, δ -P, ϵ-P, EurA, Firm, γ-P	BC, β-P, δ-P, EurA, Firm, γ-P	BC, β-P, δ-P, Eury, Firm, γ-P
Peroxidase	+	+	+	β-P, δ-P	δ-P, Firm, γ-P	γ-P
Cytochrome c551 peroxidase	+	+	-	ϵ-P, γ-P	ϵ-P, γ-P
Glutathione peroxidase	+	+	+	α-P, Firm	Firm	Cya, Firm, Spiro
[Cu-Zn]-SOD	+	+	-	BC, Firm,	α-P
[Mn]-SOD	+	+	+	α-P, β-P, Cya, DT, Dhc, Firm, γ-P, Therm	Dhc, Firm, γ-P, Therm	Dhc, EurA, γ-P
[Fe]-SOD	+	+	+	α-P, BC, β-P, Cya, δ-P, γ-P	β-P	β-P, δ-P
[Mn/Fe]-SOD	+	+	-	EurA	EurA
Superoxide reductase	+	+	+	δ-P, EurA, Firm, Therm	δ-P, EurA, Firm	δ-P, Firm
Putative scavenging systems
Ruberythrin	+	+	+	BC, Dhc, δ-P, ϵ-P, EurA, Firm	BC, Dhc, δ-P, EurA, Firm	BC, Dhc, δ-P, EurA, Firm
Rubredoxin	+	+	+	Dhc, ϵ-P, EurA, Firm, γ-P	Dhc, δ-P. EurA, Firm	Dhc, EurA
Rubredoxin-oxygen oxidoreductase	+	+	+	δ-P, EurA, Firm	δ-P, EurA, Firm	δ-P, EurA, Firm

Taxonomic abbreviations are as in Table 3.

* = partial representation of a multi-subunit enzyme complex from MG-RAST annotation.