Involved in the catabolism of cyanogenic glycosides. Naturally occurring substrates are the aliphatic acetone cyanohydrin and butan-2-one cyanohydrin, which are the aglycones of the cyanogenic glycosides linamarin, lotaustralin, linustatin and neolinustatin. Can use various aliphatic ketones and aldehydes as substrates, but not aromatic ketones. (2R)-2-hydroxy-2-methylbutanenitrile = butan-2-one + hydrogen cyanide Binds 2 Zn(2+) ions per subunit. Optimum pH is 5.5. Homodimer. In contrast to the enzyme from rosaceae, this enzyme is not glycosylated and does not contain FAD. Not inhibited by reagents interfering with Zn(2+) coordination. Belongs to the zinc-containing alcohol dehydrogenase family.