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In enzymology, a homoserine dehydrogenase is an enzyme that catalyzes the chemical reaction
The 2 substrates of this enzyme are L-homoserine and NAD , whereas its 3 products are L-aspartate 4-semialdehyde, NADH , and H.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD or NADP as acceptor. The systematic name of this enzyme class is L-homoserine:NAD oxidoreductase. Other names in common use include HSDH, and HSD.
Homoserine dehydrogenase catalyses the third step in the aspartate pathway; the NAD-dependent reduction of aspartate beta-semialdehyde into homoserine. Homoserine is an intermediate in the biosynthesis of threonine, isoleucine, and methionine.
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