Phosphonoacetaldehyde reductase (NADH) (EC 1.1.1.309, PhpC) is an enzyme with systematic name 2-hydroxyethylphosphonate:NAD oxidoreductase. This enzyme catalyses the following chemical reaction
The enzyme from Streptomyces viridochromogenes catalyses a step in the biosynthesis of phosphinothricin tripeptide, the reduction of phosphonoacetaldehyde to 2-hydroxyethylphosphonate.