Putative catalytic NodB homology domain of PgaB, IcaB, and similar proteins which consist of a deformed (beta/alpha)8 barrel fold with 5- or 6-strands. This family belongs to the large and functionally diverse carbohydrate esterase 4 (CE4) superfamily, whose members show strong sequence similarity with some variability due to their distinct carbohydrate substrates. It includes bacterial poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB, hemin storage system HmsF protein in gram-negative species, intercellular adhesion proteins IcaB, and many uncharacterized prokaryotic polysaccharide deacetylases. It also includes a putative polysaccharide deacetylase YxkH encoded by the Bacillus subtilis yxkH gene, which is one of six polysaccharide deacetylase gene homologs present in the Bacillus subtilis genome. Sequence comparison shows all family members contain a conserved domain similar to the catalytic NodB homology domain of rhizobial NodB-like proteins, which consists of a deformed (beta/alpha)8 barrel fold with 6 or 7 strands. However, in this family, most proteins have 5 strands and some have 6 strands. Moreover, long insertions are found in many family members, whose function remains unknown.

Putative catalytic NodB homology domain of a hypothetical protein Ecf1 from Escherichia coli and similar proteins. This family contains a hypothetical protein Ecf1 from Escherichia coli and its prokaryotic homologs. Although their biochemical properties remain to be determined, members in this family contain a conserved domain with a 5-stranded beta/alpha barrel, which is similar to the catalytic NodB homology domain of rhizobial NodB-like proteins, belonging to the larger carbohydrate esterase 4 (CE4) superfamily.

Polysaccharide deacetylase. This domain is found in polysaccharide deacetylase. This family of polysaccharide deacetylases includes NodB (nodulation protein B from Rhizobium) which is a chitooligosaccharide deacetylase. It also includes chitin deacetylase from yeast, and endoxylanases which hydrolyzes glucosidic bonds in xylan.

Peptidoglycan/xylan/chitin deacetylase, PgdA/CDA1 family [Carbohydrate transport and metabolism, Cell wall/membrane/envelope biogenesis].

Putative catalytic polysaccharide deacetylase domain of uncharacterized protein yadE and similar proteins. This family contains an uncharacterized protein yadE from Escherichia coli and its bacterial homologs. Although its molecular function remains unknown, yadE shows high sequence similarity with the catalytic NodB homology domain of outer membrane lipoprotein PgaB and the surface-attached protein intercellular adhesion protein IcaB. Both PgaB and IcaB are essential in bacterial biofilm formation.

CrystalStructure of a Bacillus anthracis peptidoglycan deacetylase [Bacillus anthracis],6GO1_B Crystal Structure of a Bacillus anthracis peptidoglycan deacetylase [Bacillus anthracis]

CrystalStructure of BC0361, a polysaccharide deacetylase from Bacillus cereus [Bacillus cereus ATCC 14579]

Crystalstructure of the putative polysaccharide deacetylase BA0330 from bacillus anthracis [Bacillus anthracis],4V33_B Crystal structure of the putative polysaccharide deacetylase BA0330 from bacillus anthracis [Bacillus anthracis]

ChainA, Polysaccharide deacetylase [Streptococcus pyogenes],6DQ3_B Chain B, Polysaccharide deacetylase [Streptococcus pyogenes]

Probingthe structure and mechanism of de-N-acetylase from aggregatibacter actinomycetemcomitans [Aggregatibacter actinomycetemcomitans],4U10_B Probing the structure and mechanism of de-N-acetylase from aggregatibacter actinomycetemcomitans [Aggregatibacter actinomycetemcomitans]

Putative polysaccharide deacetylase YxkH OS=Bacillus subtilis (strain 168) OX=224308 GN=yxkH PE=3 SV=1

Uncharacterized protein YadE OS=Escherichia coli (strain K12) OX=83333 GN=yadE PE=3 SV=2

Poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase OS=Escherichia coli O157:H7 OX=83334 GN=pgaB PE=3 SV=1

Poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase OS=Escherichia coli (strain K12) OX=83333 GN=pgaB PE=1 SV=1

Poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase OS=Staphylococcus aureus (strain NCTC 8325 / PS 47) OX=93061 GN=icaB PE=3 SV=2