Organism
Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)
Function
Catalyzes the depolymerization of alginate by cleaving the beta-1,4 glycosidic bond between two adjacent sugar residues via a beta-elimination mechanism (PubMed:8370530, PubMed:8335634, PubMed:23215237). May serve to degrade mislocalized alginate that is trapped in the periplasmic space. Acts preferentially on non-acetylated alginate or its precursor mannuronan. Is able to catalyze cleavage adjacent to either mannuronate or guluronate residues in alginate. Exhaustive digestion of alginate by AlgL generates dimeric and trimeric products (PubMed:23215237). In addition to its enzymatic function, AlgL appears to be required for alginate export, maybe as part of a multi-protein alginate-secretion complex (PubMed:16177314).
Similarity
Belongs to the polysaccharide lyase 5 family.
Sequence
MKTSHLIRIALPGALAAALLASQVSQAADLVPPPGYYAAVGERKGSAGSCPAVPPPYTGSLVFTSKYEGSDSARATLNVKAEKTFRSQIKDITDMERGATKLVTQYMRSGRDGDLACALNWMSAWARAGALQSDDFNHTGKSMRKWALGSLSGAYMRLKFSSSRPLAAHAEQSREIEDWFARLGTQVVRDWSGLPLKKINNHSYWAAWSVMSTAVVTNRRDLFDWAVSEFKVAANQVDEQGFLPNELKRRQRALAYHNYALPPLAMIAAFAQVNGVDLRQENHGALQRLAERVMKGVDDEETFEEKTGEDQDMTDLKVDNKYAWLEPYCALYRCEPKMLEAKKDREPFNSFRLGGEVTRVFSREGGS