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EC 1.3.5.4 Details
EC number
1.3.5.4
Accepted name
fumarate reductase (quinol)
Reaction
succinate + a quinone = fumarate + a quinol
Other name(s)
FRD, menaquinol-fumarate oxidoreductase, succinate dehydrogenase (menaquinone), succinate:menaquinone oxidoreductase, fumarate reductase (menaquinone), complex II (ambiguous)
Systematic name
succinate:quinone oxidoreductase
Comment
The enzyme, which is found in anaerobic and facultative organisms such as bacteria, parasitic helminthes, and lower marine organisms, utilizes low potential quinols, such as menaquinol and rhodoquinol, to reduce fumarate as the final step of an anaerobic respiratory chain. The enzyme is known as complex II of the electron transfer chain, similarly to EC 1.3.5.1, succinate dehydrogenase (quinone), to which it is closely related.
History
created 2010, modified 2013, deleted 2022
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
1.1.99.15 created 1978, deleted 1980
1.1.99.17 created 1982, deleted 2003