EC 3.5.2

thumb|Core structure of penicillins (top) and [[cephalosporins (bottom). Beta-lactam ring in red.]] right|thumb|Escherichia coli bacteria on the right are sensitive to two beta-lactam antibiotics, and do not grow in the semi-circular regions surrounding antibiotics. E. coli bacteria on the left are resistant to beta-lactam antibiotics, and grow next to one antibiotic (bottom) and are less inhibited by another antibiotic (top).

chemical compound

Dihydroorotase (, carbamoylaspartic dehydrase, dihydroorotate hydrolase) is an enzyme which converts carbamoyl aspartic acid into 4,5-dihydroorotic acid in the biosynthesis of pyrimidines. It forms a multifunctional enzyme with carbamoyl phosphate synthetase and aspartate transcarbamoylase. Dihydroorotase is a zinc metalloenzyme.

Amidohydrolases (or amidases) are a type of hydrolase that acts upon amide bonds.

class of enzymes

In enzymology, a creatininase () is an enzyme that catalyses the hydrolysis of creatinine to creatine, which can then be metabolised to urea and sarcosine by creatinase.

protein-coding gene in the species Homo sapiens

In enzymology, an imidazolonepropionase () is an enzyme that catalyzes the chemical reaction

In enzymology, an allantoinase () is an enzyme that catalyzes the chemical reaction