Cyanate lyase (also known as cyanase) EC:4.2.1.104 is responsible for the hydrolysis of cyanate, allowing organisms that possess the enzyme to overcome the toxicity of environmental cyanate. This enzyme is composed of two domains, an N-terminal helix-turn-helix and this structurally unique C-terminal domain [2].

1: Characterization of the cyn operon in Escherichia coli K12. Sung YC, Fuchs JA; J Biol Chem 1988;263:14769-14775. PMID:3049588

2: Structure of cyanase reveals that a novel dimeric and decameric arrangement of subunits is required for formation of the enzyme active site. Walsh MA, Otwinowski Z, Perrakis A, Anderson PM, Joachimiak A; Structure Fold Des 2000;8:505-514. PMID:10801492