3,4-dihydroxyphenylacetate 2,3-dioxygenase MGKLALAAKITHVPSMYLSELPGKNHGCRQGAIDGHKEISKRCREMGVDTIIVFDTHWLVNSAYHINCADHFEGVYTSNELPHFIRDMTYNYEGNPELGQLIADEALKLGVRAKAHNIPSLKLEYGSVVPMRYMNEDKRFKVVSISAFCTVHDFADSRKLGERIVKAIEQYDGTVAVLASGSLSHRFIDDQRAEEGMNSYTREFDRQMDERVVKLWREGQFKEFCNMLPEYADYCYGEGNMHDTVMLLGMLGWDKYDGKVWSLSPSYSQASWHRSG Transforms homoprotocatechuic acid (HPC) into 5- carboxymethyl-2-hydroxy-muconic semialdehyde (CHMS). Homoprotocatechuate 2,3-dioxygenase HPCB_ECOLX hpcB 276