Alginate biosynthesis protein Alg44; Required for alginate biosynthesis.

Alginate biosynthesis protein AlgX; Plays two roles in the biosynthesis of the exopolysaccharide alginate: protects alginate from degradation as the polymer traverses the periplasm, and also plays a role in its O-acetylation. Probably has acetyltransferase activity in vivo (By similarity).

Alginate biosynthesis protein 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 (By similarity).

Alginate lyase; 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.

Alginate biosynthesis protein Alg8; Possibly a processive enzyme that polymerizes GDP-mannuronic acid.

Alginate biosynthesis protein 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 the ability of alginate to act as a defense barrier (By similarity).

Alginate biosynthesis protein 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 the ability of alginate to act as a defense barrier (By similarity).

Alginate biosynthesis protein 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 the ability of alginate to act as a defense barrier (By similarity).

Alginate biosynthesis protein AlgA; Produces a precursor for alginate polymerization. The alginate layer provides a protective barrier against host immune defenses and antibiotics (By similarity).