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Literature summary for 2.5.1.47 extracted from

  • Warrilow, A.G.S.; Hawkesford, M.J.
    Cysteine synthase (O-acetylserine (thiol) lyase) substrate specificities classify the mitochondrial isoform as a cyanoalanine synthase (2000), J. Exp. Bot., 51, 985-993.
    View publication on PubMed

Inhibitors

Inhibitors Comment Organism Structure
chloroalanine substrate inhibition Spinacia oleracea
L-cysteine substrate inhibition Spinacia oleracea
O-acetylserine substrate inhibition Spinacia oleracea
Sulfide substrate inhibition Spinacia oleracea

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.108
-
cysteine pH 8.0, 26°C, cysteine synthase A Spinacia oleracea
0.201
-
cysteine pH 8.0, 26°C, cysteine synthase B Spinacia oleracea
0.785
-
chloroalanine pH 8.0, 26°C, cysteine synthase B Spinacia oleracea
1.03
-
O-acetylserine pH 8.0, 26°C, cysteine synthase B Spinacia oleracea
1.053
-
chloroalanine pH 8.0, 26°C, cysteine synthase A Spinacia oleracea
1.355
-
O-acetylserine pH 8.0, 26°C, cysteine synthase A Spinacia oleracea

Localization

Localization Comment Organism GeneOntology No. Textmining

Organism

Organism UniProt Comment Textmining
Spinacia oleracea
-
L. cv. Medina
-

Purification (Commentary)

Purification (Comment) Organism
isoenzyme A and B Spinacia oleracea

Source Tissue

Source Tissue Comment Organism Textmining
leaf
-
Spinacia oleracea
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
chloroalanine + sulfide 3-6% of the activity of the cysteine synthase reaction Spinacia oleracea cysteine + chloride
-
r
cysteine + CN-
-
Spinacia oleracea cyanoalanine + H2S H2S i.e. bisulfide ?
O-acetyl-L-Ser + H2S
-
Spinacia oleracea L-Cys + acetate
-
r

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
9 11.5
-
Spinacia oleracea

Ki Value [mM]

Ki Value [mM] Ki Value maximum [mM] Inhibitor Comment Organism Structure
0.8
-
chloroalanine pH 9.8, 26 C, cysteine synthase B Spinacia oleracea
1.135
-
chloroalanine pH 9.8, 26 C, cysteine synthase A Spinacia oleracea
2.074
-
L-cysteine pH 8.0, 26 C, cysteine synthase A Spinacia oleracea
2.113
-
cysteine pH 8.0, 26 C, cysteine synthase B Spinacia oleracea
5.546
-
chloroalanine pH 8.0, 26 C, cysteine synthase B Spinacia oleracea
19.56
-
O-acetylserine pH 8.0, 26 C, cysteine synthase B Spinacia oleracea
32.25
-
O-acetylserine pH 8.0, 26 C, cysteine synthase A Spinacia oleracea
70.92
-
chloroalanine pH 8.0, 26 C, cysteine synthase A Spinacia oleracea