A recent article by the CAZy team [1], defines and describes in an extended manner :
(i) the catalytic mechanisms covered by the PL classification ;
(ii) the know PL activities and how these are distributed in the present PL families ;
(iii) the diversity of folds exhibited in structurally characterized PL families ;
(iv) the new layer of PL subfamilies that has been defined throughout the PL families.
[1] Lombard V, Bernard T, Rancurel C, Brumer H, Coutinho PM, Henrissat B (2010) A hierarchical classification of polysaccharide lyases for glycogenomics. Biochem. J. 432:437-444 [PMID : 20925655].