Involved in the gamma-resorcylate (2,6-dihydroxybenzoate) catabolism (PubMed:26319878). Catalyzes the reversible decarboxylation of gamma-resorcylate to resorcinol (PubMed:26319878). 2,6-dihydroxybenzoate + H(+) = CO2 + resorcinol Binds 1 Zn(2+) ion per subunit. Aromatic compound metabolism. Induced in the presence of gamma-resorcylate. The mutant is unable to grow on gamma-resorcylate as a sole energy and carbon source. Belongs to the metallo-dependent hydrolases superfamily. ACMSD family.