Phosphomannomutase AlgC; Highly reversible phosphoryltransferase. The phosphomannomutase activity produces a precursor for alginate polymerization, the alginate layer causes a mucoid phenotype and provides a protective barrier against host immune defenses and antibiotics. Also involved in core lipopolysaccaride (LPS) biosynthesis due to its phosphoglucomutase activity. Essential for rhamnolipid production, an exoproduct correlated with pathogenicity. Required for biofilm production. The reaction proceeds via 2 processive phosphoryl transferase reactions; first from enzyme-phospho-Ser-1 [...]

Alginate o-acetyltransferase AlgJ; Together with AlgI and AlgF, forms an inner membrane complex which probably interacts with the alginate polymerization-transport complex and adds acetyl groups at the O-2 and O-3 positions of mannuronate residues. Acetylation of alginate is important for the architecture of biofilms and increases resistance to opsonic killing in the host.

Poly(beta-d-mannuronate) lyase precursor AlgL; Catalyzes the depolymerization of alginate by cleaving the beta-1,4 glycosidic bond between two adjacent sugar residues via a beta-elimination mechanism. 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. In addition to its enzymatic function, AlgL appears [...]

Alginate biosynthesis protein Alg44; Required for alginate biosynthesis. Belongs to the Alg44 family.

Alginate production outer membrane protein AlgE precursor; Has non-porin-like, channel-forming properties and probably functions as an alginate permeability pore.

Alginate-c5-mannuronan-epimerase AlgG; Catalyzes the epimerization of beta-D-mannuronate to alpha-L- guluronate during the synthesis of the linear polysaccharide alginate. In addition, is part of a periplasmic protein complex that protects alginate from degradation by AlgL by channeling the newly formed alginate polymer through a scaffold that transfers the alginate polymer through the periplasmic space to the outer membrane secretin AlgE.

Alginate o-acetyltransferase AlgF; Together with AlgI and AlgJ, forms an inner membrane complex which probably interacts with the alginate polymerization-transport complex and adds acetyl groups at the O-2 and O-3 positions of mannuronate residues. Acetylation of alginate is important for the architecture of biofilms and increases resistance to opsonic killing in the host.

Alginate biosynthesis protein Alg8; Processive enzyme that polymerizes GDP-mannuronic acid. Belongs to the glycosyltransferase 2 family.

Alginate o-acetyltransferase AlgI; Together with AlgJ and AlgF, forms an inner membrane complex which probably interacts with the alginate polymerization-transport complex and adds acetyl groups at the O-2 and O-3 positions of mannuronate residues. Acetylation of alginate is important for the architecture of biofilms and increases resistance to opsonic killing in the host.