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4.2.1.22: cystathionine beta-synthase

This is an abbreviated version!
For detailed information about cystathionine beta-synthase, go to the full flat file.

Word Map on EC 4.2.1.22

Reaction

L-serine
+
L-homocysteine
=
L-cystathionine
+
H2O

Synonyms

Beta-thionase, CBS, CBS424, CDCP2, CNNM2, Cys4, CysB, cystathionine beta synthase, cystathionine beta-synthase, cystathionine beta-synthase domain-containing protein, cystathionine-beta-synthase, Cysteine synthase, EC 4.2.1.21, hCBS, Hemoprotein H-450, LbrM.17.0230, Methylcysteine synthase, osmoprotectant transporter OpuC, PF1953, PH0267, Serine sulfhydrase, Serine sulfhydrylase, Serine sulphhydrase, TA0289, TM0935, TV1335, yCBS, ytCBS

ECTree

     4 Lyases
         4.2 Carbon-oxygen lyases
             4.2.1 Hydro-lyases
                4.2.1.22 cystathionine beta-synthase

Turnover Number

Turnover Number on EC 4.2.1.22 - cystathionine beta-synthase

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TURNOVER NUMBER [1/s]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.35 - 0.78
H2S
5.9 - 34
homocysteine
0.0045 - 6.08
L-cystathionine
0.022 - 31.34
L-cysteine
0.024 - 26.78
L-homocysteine
0.052 - 45
L-serine
additional information
additional information
-
the kcat for the generation of H2S by cystathionine beta-synthase of 55/s at 37°C, via the condensation of cysteine and homocysteine is 18fold faster than that for the beta-elimination and rehydration to form serine of 3/s-
-