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Literature summary extracted from

  • Childers, S.E.; Noll, K.M.
    Characterization and regulation of sulfur reductase activity in Thermotoga neapolitana (1994), Appl. Environ. Microbiol., 60, 2622-2626.
    View publication on PubMedView publication on EuropePMC

KM Value [mM]

EC Number KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
1.12.98.4 0.15
-
 Polysulfide PDH Thermotoga neapolitana

Organism

EC Number Organism UniProt Comment Textmining
1.12.98.4 Thermotoga neapolitana
-
-
-

Oxidation Stability

EC Number Oxidation Stability Organism
1.12.98.4 PDH activity is oxygen labile in crude extracts Thermotoga neapolitana

Reaction

EC Number Reaction Comment Organism Reaction ID
1.12.98.4 H2 + (sulfide)n = hydrogen sulfide + (sulfide)n-1 two enzymes: hydrogenase with sulfur reductase activity and an NADPH-utilizing polysulfide dehydrogenase are detected Thermotoga neapolitana
a

Specific Activity [micromol/min/mg]

EC Number Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
1.12.98.4 additional information
-
 spec. act. for the PDH are 12 to 48fold higher than for sulfhydrogenase Thermotoga neapolitana

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1.12.98.4 disulfide + electron donor cystine and cystamine, minimal activities, PDH Thermotoga neapolitana H2S
-
 ?
1.12.98.4 polysulfide + electron donor highest activity, NADH and NADPH as electron donors for PDH, hydrogen alone can reduce polysulfide via sulfhydrogenase, but the amount of this activity is minimal compared with that of PDH Thermotoga neapolitana H2S + oxidized electron donor
-
 ?
1.12.98.4 sulfur + electron donor electron donor: NADH or NAPDH Thermotoga neapolitana H2S + oxidized electron donor
-
 ?

Synonyms

EC Number Synonyms Comment Organism
1.12.98.4 polysulfide dehydrogenase PDH Thermotoga neapolitana
1.12.98.4 sulfhydrogenase homology of hydrogenase and sulfur reductase Thermotoga neapolitana