:Pectate trisaccharide-lyase

{{Infobox enzyme

| Name = Pectate trisaccharide-lyase

| EC_number = 4.2.2.22

| CAS_number =

| GO_code =

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Pectate trisaccharide-lyase ({{EnzExplorer|4.2.2.22}}, exopectate-lyase, pectate lyase A, PelA) is an enzyme with systematic name (1→4)-α-D-galacturonan reducing-end-trisaccharide-lyase.{{cite journal | vauthors = Kluskens LD, van Alebeek GJ, Voragen AG, de Vos WM, van der Oost J | title = Molecular and biochemical characterization of the thermoactive family 1 pectate lyase from the hyperthermophilic bacterium Thermotoga maritima | journal = The Biochemical Journal | volume = 370 | issue = Pt 2 | pages = 651–9 | date = March 2003 | pmid = 12443532 | pmc = 1223193 | doi = 10.1042/bj20021595 }}{{cite journal | vauthors = Tamaru Y, Doi RH | title = Pectate lyase A, an enzymatic subunit of the Clostridium cellulovorans cellulosome | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 98 | issue = 7 | pages = 4125–9 | date = March 2001 | pmid = 11259664 | pmc = 31190 | doi = 10.1073/pnas.071045598 | doi-access = free }}{{cite journal | vauthors = Berensmeier S, Singh SA, Meens J, Buchholz K | title = Cloning of the pelA gene from Bacillus licheniformis 14A and biochemical characterization of recombinant, thermostable, high-alkaline pectate lyase | journal = Applied Microbiology and Biotechnology | volume = 64 | issue = 4 | pages = 560–7 | date = May 2004 | pmid = 14673544 | doi = 10.1007/s00253-003-1446-9 | s2cid = 23236787 }} This enzyme catalyses the following chemical reaction:

: eliminative cleavage of unsaturated trigalacturonate as the major product from the reducing end of polygalacturonic acid/pectate

The predominant action of this enzyme is removal of a trisaccharide.