Amidase involved in auxin biosynthesis. Converts indole-3-acetamide to indole-3-acetate (PubMed:12620340, PubMed:27135507). Converts phenyl-2-acetamide (PAM) to phenyl-2-acetate. Substrate preference is PAM > IAM (PubMed:27135507). Can also use L-asparagine and 1-naphtalene-acetamide as substrates, but not indole-3-acetonitrile or indole-3-acetyl-L-aspartic acid (PubMed:12620340). a monocarboxylic acid amide + H2O = a monocarboxylate + NH4(+) H2O + indole-3-acetamide = (indol-3-yl)acetate + NH4(+) 2-phenylacetamide + H2O = 2-phenylacetate + NH4(+) H2O + L-asparagine = L-aspartate + NH4(+) 1-naphthaleneacetamide + H2O = 1-naphthaleneacetate + NH4(+) Inhibited by phenylmethylsulfonyl fluoride (PMSF). Optimum pH is 7.0 (PubMed:12620340). Optimum pH is 7.5 (PubMed:27135507). Optimum temperature is 35-37 degrees Celsius (PubMed:12620340, PubMed:27135507). Optimum temperature is 37 degrees Celsius (PubMed:27135507). Expressed in cotyledons, leaves and flower buds. Lower levels in roots, stems and siliques. No visible phenotype under normal growth conditioins. Belongs to the amidase family.