1.2.1.75: malonyl-CoA reductase (malonate semialdehyde-forming)
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Synonyms
bi-functional malonyl-CoA reductase, malonate semialdehyde reductase, malonate-semialdehyde dehydrogenase, malonyl CoA reductase (malonate semialdehyde-forming), malonyl-CoA reductase, MCR, More, MSAR
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Systematic Name
Systematic Name on EC 1.2.1.75 - malonyl-CoA reductase (malonate semialdehyde-forming)
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malonate semialdehyde:NADP+ oxidoreductase (malonate semialdehyde-forming)
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].