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Polysaccharide Lyase Family 19

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This family has been deleted from the CAZy classification. A specific explanation may be found below.

PL19 is a deleted family

Entries in Glycoside Hydrolase Family 91 were reclassified to Polysaccharide Lyase Family 19 on 30 July 2008 due to recommendations of the NC-IUBMB, which stated that these enzymes are lyases, as there is no water involved in the reaction. Indeed, polysaccharide cleavage occurs via intramolecular hydroxide attack, rather than glycosidic bond hydrolysis (see EC and EC

The family was placed back to Glycoside Hydrolase Family 91 on 20 April 2010 due to direct analogy with the lytic transglycosidases of GH23, GH102, GH103, and GH104 and in particular the observation of a hydrolase (di-fructofuranose 1,2':2,3' dianhydride hydrolase, DFA-IIIase) in this family [1, 2, 3].

CAZy DB links


  1. H. Sakurai, A. Yokota, Y. Sumita, Y. Mori, H. Matsui and F. Tomita, Metabolism of DFA III by Arthrobacter sp. H65-7: purification and properties of a DFA III hydrolysis enzyme (DFA IIIase). Biosci. Biotechnol. Biochem. 61 (1997), pp. 989–993. DOI: 10.1271/bbb.61.989

  2. Saito K, Sumita Y, Nagasaka Y, Tomita F, and Yokota A. (2003). Molecular cloning of the gene encoding the di-D-Fructofuranose 1,2':2,3' dianhydride hydrolysis enzyme (DFA IIIase) from Arthrobacter sp. H65-7. J Biosci Bioeng. 2003;95(5):538-40. DOI:10.1016/s1389-1723(03)80058-0 | PubMed ID:16233453 [Saito2003]
  3. Lombard V, Bernard T, Rancurel C, Brumer H, Coutinho PM, and Henrissat B. (2010). A hierarchical classification of polysaccharide lyases for glycogenomics. Biochem J. 2010;432(3):437-44. DOI:10.1042/BJ20101185 | PubMed ID:20925655 [Lombard2010]

All Medline abstracts: PubMed