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Literature summary for 1.8.7.1 extracted from

  • Krueger, R.J.; Siegel, L.M.
    Spinach siroheme enzymes: Isolation and characterization of ferredoxin-sulfite reductase and comparison of properties with ferredoxin-nitrite reductase (1982), Biochemistry, 21, 2892-2904.
    View publication on PubMed

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.011
-
sulfite 63K enzyme, reduced methyl viologen as electron donor Spinacia oleracea
0.012
-
sulfite 69K enzyme, reduced methyl viologen as electron donor Spinacia oleracea
0.019
-
reduced ferredoxin 69K enzyme Spinacia oleracea
0.021
-
sulfite 63K enzyme, ferredoxin als electeron donor Spinacia oleracea
0.021
-
reduced ferredoxin 63K enzyme Spinacia oleracea
0.025
-
sulfite 69K enzyme, ferredoxin as electron donor Spinacia oleracea

Metals/Ions

Metals/Ions Comment Organism Structure
4Fe-4S 1 mol per mol subunit Spinacia oleracea

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
63000
-
2 * 63000, 63K form of the enzyme, 50 mM phosphate buffer pH 7.7, 20°C, SDS-PAGE Spinacia oleracea
69000
-
2 * 69000, 69K form of the enzyme, probably partially processed to a 63000 Da species, 50 mM phosphate buffer pH 7.7, 20°C, SDS-PAGE Spinacia oleracea
112000 119000 63K enzyme, equilibrium sedimentation, gel filtration Spinacia oleracea
134000
-
69K enzyme, equilibrium sedimentation Spinacia oleracea

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
sulfite + reduced ferredoxin Spinacia oleracea
-
hydrogen sulfide + oxidized ferredoxin + H2O
-
?

Organism

Organism UniProt Comment Textmining
Spinacia oleracea
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
Spinacia oleracea

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
8.9
-
69K enzyme Spinacia oleracea
10.3
-
63K enzyme Spinacia oleracea

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
sulfite + reduced ferredoxin
-
Spinacia oleracea hydrogen sulfide + oxidized ferredoxin + H2O
-
?
sulfite + reduced ferredoxin reduced methyl viologen as electron donor also Spinacia oleracea hydrogen sulfide + oxidized ferredoxin + H2O
-
?
sulfite + reduced ferredoxin + H+
-
Spinacia oleracea hydrogen sulfide + oxidized ferredoxin + H2O
-
r

Subunits

Subunits Comment Organism
dimer 2 * 69000, 69K form of the enzyme, probably partially processed to a 63000 Da species, 50 mM phosphate buffer pH 7.7, 20°C, SDS-PAGE Spinacia oleracea
dimer 2 * 63000, 63K form of the enzyme, 50 mM phosphate buffer pH 7.7, 20°C, SDS-PAGE Spinacia oleracea

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
22
-
enzyme assay, reduced methyl viologen as electron donor Spinacia oleracea

Cofactor

Cofactor Comment Organism Structure
siroheme 1 mol per mol subunit, in the high-spin Fe3+ state in the reduced enzyme Spinacia oleracea