_EC 4.-.-.- Lyases. 10,244 PDB entries  
EC 4.-.-.-
Lyases.
The lyases are enzymes cleaving C-C, C-O, C-N, and other bonds by elimination, leaving double bonds or rings, or conversely adding groups to double bonds.

See also: [IUBMB] (Enzyme Nomenclature)

EC 4.-.-.- Lyases. [10,244 PDB entries]
EC 4.1.-.- Carbon-carbon lyases. [2,336 PDB entries]
EC 4.2.-.- Carbon-oxygen lyases. [5,836 PDB entries]
EC 4.3.-.- Carbon-nitrogen lyases. [543 PDB entries]
EC 4.4.-.- Carbon-sulfur lyases. [414 PDB entries]
EC 4.5.-.- Carbon-halide lyases. [6 PDB entries]
EC 4.6.-.- Phosphorus-oxygen lyases. [904 PDB entries]
EC 4.7.-.- Carbon-phosphorus lyases. [6 PDB entries]
EC 4.8.-.- Nitrogen-oxygen lyases. [13 PDB entries]
EC 4.98.-.- ATP-independent chelatases. [78 PDB entries]
EC 4.99.-.- Other lyases. [108 PDB entries]