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CATH Superfamily 3.30.70.20

The name of this superfamily has been modified since the most recent official CATH+ release (v4_2_0). At the point of the last release, this superfamily was: waiting to be named.

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
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FunFam 39787: Tetrathionate reductase, subunit B

There are 4 EC terms in this cluster

Please note: EC annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

Note: The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.

EC Term Annotations Evidence
Thiosulfate--dithiol sulfurtransferase. [EC: 2.8.1.5]
Thiosulfate + dithioerythritol = sulfite + 4,5-cis-dihydroxy-1,2- dithiacyclohexane + sulfide.
  • The enzyme from Chlorella shows very little activity toward monothiols such as glutathione and cysteine (cf. EC 2.8.1.3).
  • The enzyme probably transfers the sulfur atom onto one thiol group to form -S-S(-), and sulfide is spontaneously expelled from this by reaction with the other thiol group.
  • May be identical with EC 2.8.1.1.
 6 E1SPL6 E1SPL6 I3XUI8 I3XUI8 L0FBP2 L0FBP2
Selenate reductase. [EC: 1.97.1.9]
Selenite + H(2)O + acceptor = selenate + reduced acceptor.
  • The periplasmic enzyme from Thauera selenatis is a complex comprising three heterologous subunits (alpha, beta and gamma).
  • Nitrate, nitrite, chlorate and sulfate are not substrates.
  • A number of compounds, including acetate, lactate, pyruvate, and certain sugars, amino acids, fatty acids, di- and tricarboxylic acids, and benzoate can serve as electron donors.
 4 Q3AS09 Q3AS09 Q3ASY3 Q3ASY3
Sulfhydrogenase. [EC: 1.12.98.4]
H(2) + polysulfide(n) = hydrogen sulfide + polysulfide(n-1).
  • The enzyme from the hyperthermophilic archaeon Pyrococcus furiosus is part of two heterotetrameric complexes where the beta and gamma subunits function as sulfur reductase and the alpha and delta subunits function as hydrogenases (EC 1.12.1.3 and EC 1.12.1.4).
  • Sulfur can also be used as substrate, but since it is insoluble in aqueous solution and polysulfide is generated abiotically by the reaction of hydrogen sulfide and sulfur, polysulfide is believed to be the true substrate.
  • Formerly EC 1.97.1.3.
 4 A0A0P7LNQ2 A0A0P7LNQ2 Q8EA48 Q8EA48
Nitrate reductase. [EC: 1.7.99.4]
Nitrite + acceptor = nitrate + reduced acceptor.
  • The Pseudomonas enzyme is a cytochrome, but the enzyme from Micrococcus halodenitrificans is an iron protein containing molybdenum.
  • Reduced benzyl viologen and other dyes bring about the reduction of nitrate.
 2 B6R3E4 B6R3E4
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