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EC 1.14.19.20 Details
EC number
1.14.19.20
Accepted name
Δ7-sterol 5(6)-desaturase
Reaction
a Δ7-sterol + 2 ferrocytochrome b5 + O2 + 2 H+ = a Δ5,7-sterol + 2 ferricytochrome b5 + 2 H2O
Other name(s)
lathosterol oxidase, Δ7-sterol Δ5-dehydrogenase, Δ7-sterol 5-desaturase, Δ7-sterol-C5(6)-desaturase, 5-DES, SC5DL (gene name), ERG3 (gene name)
Systematic name
Δ7-sterol,ferrocytochrome b5:oxygen oxidoreductase 5,6-dehydrogenating
CAS registry number
37255-37-1
Comment
This enzyme, found in eukaryotic organisms, catalyses the introduction of a double bond between the C5 and C6 carbons of the B ring of Δ7-sterols, to yield the corresponding Δ5,7-sterols. The enzymes from yeast, plants and vertebrates act on avenasterol, episterol, and lathosterol, respectively. The enzyme is located at the endoplasmic reticulum and is membrane bound.
History
created 1972 as EC 1.3.3.2, transferred 2005 to EC 1.14.21.6, transferred 2015 to EC 1.14.19.20
EC Tree
1.1.1.68 created 1965, deleted 1978 [transferred to EC 1.1.99.15, deleted 1980]
1.1.1.70 created 1965, deleted 1978
1.1.1.74 created 1972, deleted 1976
1.1.1.89 created 1972, deleted 1976
1.1.1.109 created 1972, deleted 1976
1.1.1.139 created 1972, deleted 1978
1.1.1.155 created 1976, deleted 2004
1.1.1.171 created 1978, deleted 1984
1.1.1.180 created 1983, deleted 1984
1.1.1.182 created 1983, deleted 1990
1.1.1.204 created 1972 as EC 1.2.1.37, transferred 1984 to EC 1.1.1.204, modified 1989, deleted 2004
1.1.1.242 created 1992, deleted 2001
1.1.1.249 provisional version created 1999, deleted 1999 (reinstated 2001 as EC 2.5.1.46)
1.1.1.253 created 1999, deleted 2003