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EC 1.2.1.75 Details
EC number
1.2.1.75
Accepted name
malonyl-CoA reductase (malonate semialdehyde-forming)
Reaction
malonate semialdehyde + CoA + NADP+ = malonyl-CoA + NADPH + H+
Other name(s)
NADP-dependent malonyl CoA reductase, malonyl CoA reductase (NADP), malonyl CoA reductase (malonate semialdehyde-forming)
Systematic name
malonate semialdehyde:NADP+ oxidoreductase (malonate semialdehyde-forming)
Comment
Requires Mg2+. Catalyses the reduction of malonyl-CoA to malonate semialdehyde, a key step in the 3-hydroxypropanoate and the 3-hydroxypropanoate/4-hydroxybutanoate cycles, autotrophic CO2 fixation pathways found in some green non-sulfur phototrophic bacteria and some thermoacidophilic archaea, respectively [1,2]. The enzyme from Sulfolobus tokodaii has been purified, and found to contain one RNA molecule per two subunits [3]. The enzyme from Chloroflexus aurantiacus is bifunctional, and also catalyses the next reaction in the pathway, EC 1.1.1.298 [3-hydroxypropionate dehydrogenase (NADP+)] [4].
History
created 2009
EC Tree
1.2.1.1 created 1961, modified 1982, modified 2002, deleted 2005
1.2.1.6 created 1961, deleted 1965
1.2.1.14 created 1961, deleted 1984
1.2.1.34 created 1972, deleted 1983 [transferred to EC 1.1.1.180, deleted 1984]
1.2.1.35 created 1972, deleted 1984
1.2.1.37 created 1972, deleted 1984
1.2.1.55 created 1990, deleted 2003
1.2.1.56 created 1990, deleted 2003
1.2.3.2 created 1961, deleted 1984
1.2.3.10 created 1990, deleted 2003
1.2.3.12 created 2000, deleted 2003