EC number 1.2.1.27 IntEnz IntEnz view ExPASy NiceZyme view | CAS number 37205-49-5 BRENDA BRENDA entry KEGG KEGG entry | |
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In enzymology, a methylmalonate-semialdehyde dehydrogenase (acylating) (EC 1.2.1.27) is an enzyme that catalyzes the chemical reaction
2-methyl-3-oxopropanoate + CoA + H2O + NAD+ ⇌ propanoyl-CoA + HCO3- + NADHThe 4 substrates of this enzyme are 2-methyl-3-oxopropanoate, CoA, H2O, and NAD+, whereas its 3 products are propanoyl-CoA, HCO3-, and NADH.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 2-methyl-3-oxopropanoate:NAD+ 3-oxidoreductase (CoA-propanoylating). Other names in common use include MSDH, and MMSA dehydrogenase. This enzyme participates in 3 metabolic pathways: inositol metabolism, valine, leucine and isoleucine degradation, and propanoate metabolism.
Structural studies
As of late 2007, only one structure has been solved for this class of enzymes, with the PDB accession code 1T90.