Plays a crucial role in the hydrolysis of isoamyl acetate in sake mash (Ref.2). Hydrolyzes short chain esters from acetate (C2) to hexanoate (C6), showing more specificity for shorter chain exters. No activity for decanoate (C10) esters (PubMed:21069734). 3-methylbutyl acetate + H2O = 3-methylbutanol + acetate + H(+) Optimum pH is 7.5. Homodimer. Accumulates approximately 19 times higher amounts of isoamyl acetate compared to wild-type in laboratory scale sake brewing. Belongs to the 'GDSL' lipolytic enzyme family. IAH1 subfamily.