MSASGRPQPMGRLTTHVLDSAHGCPGHGIKIELYRVEGQQLELIATTLTNHDGRCDQPVLQGEDFRPGVYQLVFNAGDYYRARGVQLPEPAFLDQVVLRFGIASADDHYHVPLLISPYSYSTYRGS Catalyzes the hydrolysis of 5-hydroxyisourate (HIU) to 2-oxo-4-hydroxy-4-carboxy-5-ureidoimidazoline (OHCU) (By similarity). 126 HIUH_PSEAE PA1518 5-hydroxyisourate hydrolase PA1518