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{{enzyme
| Name = lactaldehyde reductase (NADPH)
| EC_number = 1.1.1.55
| CAS_number = 9028-43-7
| IUBMB_EC_number = 1/1/1/55
| GO_code = 0050039
| image = 
| width = 
| caption = 
}}
In [[enzymology]], a '''lactaldehyde reductase (NADPH)''' ({{EC number|1.1.1.55}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]

:propane-1,2-diol + NADP<sup>+</sup> <math>\rightleftharpoons</math> L-lactaldehyde + NADPH + H<sup>+</sup>

Thus, the two [[substrate (biochemistry)|substrates]] of this enzyme are [[Propylene glycol|1,2-propanediol]] and [[nicotinamide adenine dinucleotide phosphate|NADP<sup>+</sup>]], whereas its 3 [[product (chemistry)|products]] are [[L-lactaldehyde]], [[nicotinamide adenine dinucleotide phosphate|NADPH]], and [[hydrogen ion|H<sup>+</sup>]].

This enzyme belongs to the family of [[oxidoreductase]]s, specifically those acting on the CH-OH group of donor with NAD<sup>+</sup> or NADP<sup>+</sup> as acceptor. The systematic name of this enzyme class is '''propane-1,2-diol:NADP<sup>+</sup> oxidoreductase'''. Other names in common use include '''lactaldehyde (reduced nicotinamide adenine dinucleotide phosphate)''', '''reductase''', '''NADP<sup>+</sup>-1,2-propanediol dehydrogenase''', '''propanediol dehydrogenase''', '''1,2-propanediol:NADP<sup>+</sup> oxidoreductase''', and '''lactaldehyde reductase (NADPH)'''.

==References==
{{reflist|1}}
* {{cite journal | author = Gupta NK, Robinson WG | date = 1960 | title = The enzymatic conversion of lactaldehyde to propanediol | journal = J. Biol. Chem. | volume = 235 | pages = 1609&ndash;12 | pmid = 13830319 }}

[[Category:EC 1.1.1]]
[[Category:NADPH-dependent enzymes]]
[[Category:Enzymes of unknown structure]]


{{1.1.1-enzyme-stub}}