poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB catalyzes the N-deacetylation of poly-beta-1,6-N-acetyl-D-glucosamine (PGA), a biofilm adhesin polysaccharide; N-deacetylation promotes PGA export through the PgaA porin
poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB; Two well-characterized systems ...
29-651
0e+00
poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB; Two well-characterized systems produce polysaccharide based on N-acetyl-D-glucosamine in straight chains with beta-1,6 linkages. These are encoded by the icaADBC operon in Staphylococcus species, where the system is designated polysaccharide intercellular adhesin (PIA), and the pgaABCD operon in Gram-negative bacteria such as E. coli. Both systems include a putative polysaccharide deacetylase. The PgaB protein, described here, contains an additional domain lacking from its Gram-positive counterpart IcaB (TIGR03933). Deacetylation by this protein appears necessary to allow export through the porin PgaA [Cell envelope, Biosynthesis and degradation of surface polysaccharides and lipopolysaccharides]
:
Pssm-ID: 274867 Cd Length: 619 Bit Score: 851.61 E-value: 0e+00
poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB; Two well-characterized systems ...
29-651
0e+00
poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB; Two well-characterized systems produce polysaccharide based on N-acetyl-D-glucosamine in straight chains with beta-1,6 linkages. These are encoded by the icaADBC operon in Staphylococcus species, where the system is designated polysaccharide intercellular adhesin (PIA), and the pgaABCD operon in Gram-negative bacteria such as E. coli. Both systems include a putative polysaccharide deacetylase. The PgaB protein, described here, contains an additional domain lacking from its Gram-positive counterpart IcaB (TIGR03933). Deacetylation by this protein appears necessary to allow export through the porin PgaA [Cell envelope, Biosynthesis and degradation of surface polysaccharides and lipopolysaccharides]
Pssm-ID: 274867 Cd Length: 619 Bit Score: 851.61 E-value: 0e+00
N-terminal putative catalytic polysaccharide deacetylase domain of bacterial poly-beta-1, ...
88-284
1.33e-95
N-terminal putative catalytic polysaccharide deacetylase domain of bacterial poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB, and similar proteins; This family is represented by an outer membrane lipoprotein, poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase (PgaB, EC 3.5.1.-), encoded by Escherichia coli pgaB gene from the pgaABCD (formerly ycdSRQP) operon, which affects biofilm development by promoting abiotic surface binding and intercellular adhesion. PgaB catalyzes the N-deacetylation of poly-beta-1,6-N-acetyl-D-glucosamine (PGA), a biofilm adhesin polysaccharide that stabilizes biofilms of E. coli and other bacteria. PgaB contains an N-terminal NodB homology domain with a 5-stranded beta/alpha barrel, and a C-terminal carbohydrate binding domain required for PGA N-deacetylation, which may be involved in binding to unmodified poly-beta-1,6-GlcNAc and assisting catalysis by the deacetylase domain. This family also includes several orthologs of PgaB, such as the hemin storage system HmsF protein, encoded by Yersinia pestis hmsF gene from the hmsHFRS operon, which is essential for Y. pestis biofilm formation. Like PgaB, HmsF is an outer membrane protein with an N-terminal NodB homology domain, which is likely involved in the modification of the exopolysaccharide (EPS) component of the biofilm. HmsF also has a conserved but uncharacterized C-terminal domain that is present in other HmsF-like proteins in Gram-negative bacteria. This alignment model corresponds to the N-terminal NodB homology domain.
Pssm-ID: 200586 [Multi-domain] Cd Length: 193 Bit Score: 292.32 E-value: 1.33e-95
poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB; Two well-characterized systems ...
29-651
0e+00
poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB; Two well-characterized systems produce polysaccharide based on N-acetyl-D-glucosamine in straight chains with beta-1,6 linkages. These are encoded by the icaADBC operon in Staphylococcus species, where the system is designated polysaccharide intercellular adhesin (PIA), and the pgaABCD operon in Gram-negative bacteria such as E. coli. Both systems include a putative polysaccharide deacetylase. The PgaB protein, described here, contains an additional domain lacking from its Gram-positive counterpart IcaB (TIGR03933). Deacetylation by this protein appears necessary to allow export through the porin PgaA [Cell envelope, Biosynthesis and degradation of surface polysaccharides and lipopolysaccharides]
Pssm-ID: 274867 Cd Length: 619 Bit Score: 851.61 E-value: 0e+00
N-terminal putative catalytic polysaccharide deacetylase domain of bacterial poly-beta-1, ...
88-284
1.33e-95
N-terminal putative catalytic polysaccharide deacetylase domain of bacterial poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase PgaB, and similar proteins; This family is represented by an outer membrane lipoprotein, poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase (PgaB, EC 3.5.1.-), encoded by Escherichia coli pgaB gene from the pgaABCD (formerly ycdSRQP) operon, which affects biofilm development by promoting abiotic surface binding and intercellular adhesion. PgaB catalyzes the N-deacetylation of poly-beta-1,6-N-acetyl-D-glucosamine (PGA), a biofilm adhesin polysaccharide that stabilizes biofilms of E. coli and other bacteria. PgaB contains an N-terminal NodB homology domain with a 5-stranded beta/alpha barrel, and a C-terminal carbohydrate binding domain required for PGA N-deacetylation, which may be involved in binding to unmodified poly-beta-1,6-GlcNAc and assisting catalysis by the deacetylase domain. This family also includes several orthologs of PgaB, such as the hemin storage system HmsF protein, encoded by Yersinia pestis hmsF gene from the hmsHFRS operon, which is essential for Y. pestis biofilm formation. Like PgaB, HmsF is an outer membrane protein with an N-terminal NodB homology domain, which is likely involved in the modification of the exopolysaccharide (EPS) component of the biofilm. HmsF also has a conserved but uncharacterized C-terminal domain that is present in other HmsF-like proteins in Gram-negative bacteria. This alignment model corresponds to the N-terminal NodB homology domain.
Pssm-ID: 200586 [Multi-domain] Cd Length: 193 Bit Score: 292.32 E-value: 1.33e-95
Putative catalytic NodB homology domain of a hypothetical protein Ecf1 from Escherichia coli ...
55-278
3.60e-40
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.
Pssm-ID: 213026 [Multi-domain] Cd Length: 218 Bit Score: 146.28 E-value: 3.60e-40
Putative catalytic NodB homology domain of PgaB, IcaB, and similar proteins which consist of a ...
92-251
1.63e-35
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.
Pssm-ID: 213023 [Multi-domain] Cd Length: 157 Bit Score: 131.18 E-value: 1.63e-35
Polysaccharide deacetylase; This domain is found in polysaccharide deacetylase. This family of ...
85-254
1.31e-26
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 hydrolyses glucosidic bonds in xylan.
Pssm-ID: 426305 [Multi-domain] Cd Length: 124 Bit Score: 105.01 E-value: 1.31e-26
Putative catalytic NodB homology domain of uncharacterized bacterial polysaccharide ...
91-252
6.60e-25
Putative catalytic NodB homology domain of uncharacterized bacterial polysaccharide deacetylases which consist of a 5-stranded beta/alpha barrel; This family contains many uncharacterized bacterial polysaccharide deacetylases. Although their biological functions remain unknown, all members of the family are predicted to 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.
Pssm-ID: 213028 [Multi-domain] Cd Length: 157 Bit Score: 101.19 E-value: 6.60e-25
Putative catalytic polysaccharide deacetylase domain of uncharacterized protein yadE and ...
89-268
6.63e-24
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.
Pssm-ID: 213024 [Multi-domain] Cd Length: 164 Bit Score: 98.50 E-value: 6.63e-24
Putative catalytic polysaccharide deacetylase domain of bacterial intercellular adhesion ...
89-287
1.74e-19
Putative catalytic polysaccharide deacetylase domain of bacterial intercellular adhesion protein IcaB and similar proteins; The family is represented by the surface-attached protein intercellular adhesion protein IcaB (Poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase, EC 3.5.1.-), encoded by Staphylococcus epidermidis icaB gene from the icaABC gene cluster that is involved in the synthesis of polysaccharide intercellular adhesin (PIA), which is located mainly on the cell surface. IcaB is a secreted, cell wall-associated protein that plays a crucial role in exopolysaccharide modification in bacterial biofilm formation. It catalyzes the N-deacetylation of poly-beta-1,6-N-acetyl-D-glucosamine (PNAG, also referred to as PIA), a biofilm adhesin polysaccharide. IcaB shows high homology to the N-terminal NodB homology domain of Escherichia coli PgaB. At this point, they are classified in the same family.
Pssm-ID: 200587 [Multi-domain] Cd Length: 172 Bit Score: 86.29 E-value: 1.74e-19
Putative catalytic NodB homology domain of uncharacterized prokaryotic polysaccharide ...
92-249
3.26e-16
Putative catalytic NodB homology domain of uncharacterized prokaryotic polysaccharide deacetylases which consist of a 6-stranded beta/alpha barrel; This family contains uncharacterized prokaryotic polysaccharide deacetylases. Although their biological functions remain unknown, all members of the family contain a conserved domain with a 6-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.
Pssm-ID: 213027 [Multi-domain] Cd Length: 194 Bit Score: 77.36 E-value: 3.26e-16
Catalytic NodB homology domain of rhizobial NodB-like proteins; This family belongs to the ...
91-252
1.07e-12
Catalytic NodB homology domain of rhizobial NodB-like proteins; 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 many rhizobial NodB chitooligosaccharide N-deacetylase (EC 3.5.1.-)-like proteins, mainly from bacteria and eukaryotes, such as chitin deacetylases (EC 3.5.1.41), bacterial peptidoglycan N-acetylglucosamine deacetylases (EC 3.5.1.-), and acetylxylan esterases (EC 3.1.1.72), which catalyze the N- or O-deacetylation of substrates such as acetylated chitin, peptidoglycan, and acetylated xylan. All members of this family contain a catalytic NodB homology domain with the same overall topology and a deformed (beta/alpha)8 barrel fold with 6- or 7 strands. Their catalytic activity is dependent on the presence of a divalent cation, preferably cobalt or zinc, and they employ a conserved His-His-Asp zinc-binding triad closely associated with the conserved catalytic base (aspartic acid) and acid (histidine) to carry out acid/base catalysis. Several family members show diversity both in metal ion specificities and in the residues that coordinate the metal.
Pssm-ID: 213022 [Multi-domain] Cd Length: 171 Bit Score: 66.49 E-value: 1.07e-12
Putative catalytic NodB homology domain of gellan lyase and similar proteins; This family is ...
91-250
7.07e-12
Putative catalytic NodB homology domain of gellan lyase and similar proteins; This family is represented by the extracellular polysaccharide-degrading enzyme, gellan lyase (gellanase, EC 4.2.2.-), from Bacillus sp. The enzyme acts on gellan exolytically and releases a tetrasaccharide of glucuronyl-glucosyl-rhamnosyl-glucose with unsaturated glucuronic acid at the nonreducing terminus. The family also includes many uncharacterized prokaryotic polysaccharide deacetylases, which show high sequence similarity to Bacillus sp. gellan lyase. Although their biological functions remain unknown, all members of the family contain a conserved domain with a 6-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.
Pssm-ID: 200589 [Multi-domain] Cd Length: 202 Bit Score: 65.09 E-value: 7.07e-12
Putative catalytic NodB homology domain of uncharacterized prokaryotic polysaccharide ...
92-266
5.75e-09
Putative catalytic NodB homology domain of uncharacterized prokaryotic polysaccharide deacetylases which consist of a 5-stranded beta/alpha barrel; This family contains many uncharacterized prokaryotic polysaccharide deacetylases. Although their biological functions remain unknown, all members of this family are predicted to 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.
Pssm-ID: 200593 [Multi-domain] Cd Length: 198 Bit Score: 56.55 E-value: 5.75e-09
Putative catalytic NodB homology domain of uncharacterized BH0857 protein from Bacillus ...
91-252
6.58e-09
Putative catalytic NodB homology domain of uncharacterized BH0857 protein from Bacillus halodurans and its bacterial homologs; This family is represented by a putative polysaccharide deacetylase BH0857 from Bacillus halodurans. Although its biological function still remains unknown, BH0857 shows high sequence homology to the catalytic NodB homology domain of Streptococcus pneumoniae polysaccharide deacetylase PgdA (SpPgdA), which is an extracellular metal-dependent polysaccharide deacetylase with de-N-acetylase activity toward a hexamer of chitooligosaccharide N-acetylglucosamine, but not shorter chitooligosaccharides or a synthetic peptidoglycan tetrasaccharide. Both BH0857 and SpPgdA belong to the carbohydrate esterase 4 (CE4) superfamily. This family also includes many uncharacterized bacterial polysaccharide deacetylases.
Pssm-ID: 200579 [Multi-domain] Cd Length: 195 Bit Score: 56.17 E-value: 6.58e-09
Catalytic NodB homology domain of Clostridium thermocellum acetylxylan esterase and its ...
91-335
2.94e-08
Catalytic NodB homology domain of Clostridium thermocellum acetylxylan esterase and its bacterial homologs; This family is represented by Clostridium thermocellum acetylxylan esterase (CtAXE, EC 3.1.1.72), a member of the carbohydrate esterase 4 (CE4) superfamily. CtAXE deacetylates O-acetylated xylan, a key component of plant cell walls. It shows no detectable activity on generic esterase substrates including para-nitrophenyl acetate. It is specific for sugar-based substrates and will precipitate acetylxylan, as a consequence of deacetylation. CtAXE is a monomeric protein containing a catalytic NodB homology domain with the same overall topology and a deformed (beta/alpha)8 barrel fold as other CE4 esterases. However, due to differences in the topography of the substrate-binding groove, the chemistry of the active center, and metal ion coordination, CtAXE has different metal ion preference and lacks activity on N-acetyl substrates. It is significantly activated by Co2+. Moreover, CtAXE displays distinctly different ligand coordination to the metal ion, utilizing an aspartate, a histidine, and four water molecules, as opposed to the conserved His-His-Asp zinc-binding triad of other CE4 esterases.
Pssm-ID: 200578 [Multi-domain] Cd Length: 180 Bit Score: 53.74 E-value: 2.94e-08
Catalytic NodB homology domain of the carbohydrate esterase 4 superfamily; The carbohydrate ...
92-257
7.62e-07
Catalytic NodB homology domain of the carbohydrate esterase 4 superfamily; The carbohydrate esterase 4 (CE4) superfamily mainly includes chitin deacetylases (EC 3.5.1.41), bacterial peptidoglycan N-acetylglucosamine deacetylases (EC 3.5.1.-), and acetylxylan esterases (EC 3.1.1.72), which catalyze the N- or O-deacetylation of substrates such as acetylated chitin, peptidoglycan, and acetylated xylan, respectively. Members in this superfamily contain a NodB homology domain that adopts a deformed (beta/alpha)8 barrel fold, which encompasses a mononuclear metalloenzyme employing a conserved His-His-Asp zinc-binding triad, closely associated with the conserved catalytic base (aspartic acid) and acid (histidine) to carry out acid/base catalysis. The NodB homology domain of CE4 superfamily is remotely related to the 7-stranded beta/alpha barrel catalytic domain of the superfamily consisting of family 38 glycoside hydrolases (GH38), family 57 heat stable retaining glycoside hydrolases (GH57), lactam utilization protein LamB/YcsF family proteins, and YdjC-family proteins.
Pssm-ID: 213020 [Multi-domain] Cd Length: 142 Bit Score: 48.98 E-value: 7.62e-07
Putative catalytic NodB homology domain of uncharacterized protein YlxY from Bacillus subtilis ...
84-260
1.20e-06
Putative catalytic NodB homology domain of uncharacterized protein YlxY from Bacillus subtilis and its bacterial homologs; The Bacillus subtilis genome contains six polysaccharide deacetylase gene homologs: pdaA, pdaB (previously known as ybaN), yheN, yjeA, yxkH and ylxY. This family is represented by Bacillus subtilis putative polysaccharide deacetylase BsYlxY, encoded by the ylxY gene, which is a member of the carbohydrate esterase 4 (CE4) superfamily. Although its biological function still remains unknown, BsYlxY shows high sequence homology to the catalytic domain of Bacillus subtilis pdaB gene encoding a putative polysaccharide deacetylase (BsPdaB), which is essential for the maintenance of spores after the late stage of sporulation and is highly conserved in spore-forming bacteria. However, disruption of the ylxY gene in B. subtilis did not cause any sporulation defect. Moreover, the Asp residue in the classical His-His-Asp zinc-binding motif of CE4 esterases is mutated to a Val residue in this family. Other catalytically relevant residues of CE4 esterases are also not conserved, which suggest that members of this family may be inactive.
Pssm-ID: 200574 [Multi-domain] Cd Length: 188 Bit Score: 49.20 E-value: 1.20e-06
Catalytic NodB homology domain of Streptococcus mutans polysaccharide deacetylase PgdA, Bacillus subtilis YheN, and similar proteins; This family is represented by a putative polysaccharide deacetylase PgdA from the oral pathogen Streptococcus mutans (SmPgdA) and Bacillus subtilis YheN (BsYheN), which are members of the carbohydrate esterase 4 (CE4) superfamily. SmPgdA is an extracellular metal-dependent polysaccharide deacetylase with a typical CE4 fold, with metal bound to a His-His-Asp triad. It possesses de-N-acetylase activity toward a hexamer of chitooligosaccharide N-acetylglucosamine, but not shorter chitooligosaccharides or a synthetic peptidoglycan tetrasaccharide. SmPgdA plays a role in tuning cell surface properties and in interactions with (salivary) agglutinin, an essential component of the innate immune system, most likely through deacetylation of an as-yet-unidentified polysaccharide. SmPgdA shows significant homology to the catalytic domains of peptidoglycan deacetylases from Streptococcus pneumoniae (SpPgdA) and Listeria monocytogenes (LmPgdA), both of which are involved in the bacterial defense mechanism against human mucosal lysozyme. The Bacillus subtilis genome contains six polysaccharide deacetylase gene homologs: pdaA, pdaB (previously known as ybaN), yheN, yjeA, yxkH and ylxY. The biological function of BsYheN is still unknown. This family also includes many uncharacterized polysaccharide deacetylases mainly found in bacteria.
Pssm-ID: 200569 [Multi-domain] Cd Length: 189 Bit Score: 44.85 E-value: 4.21e-05
Putative catalytic NodB homology domain of uncharacterized BH1302 protein from Bacillus ...
91-244
2.07e-04
Putative catalytic NodB homology domain of uncharacterized BH1302 protein from Bacillus halodurans and its bacterial homologs; This family is represented by a putative polysaccharide deacetylase BH1302 from Bacillus halodurans. Although its biological function is unknown, BH1302 shows high sequence homology to the catalytic NodB homology domain of Streptococcus pneumoniae polysaccharide deacetylase PgdA (SpPgdA), which is an extracellular metal-dependent polysaccharide deacetylase with de-N-acetylase activity toward a hexamer of chitooligosaccharide N-acetylglucosamine, but not shorter chitooligosaccharides or a synthetic peptidoglycan tetrasaccharide. Both BH1302 and SpPgdA belong to the carbohydrate esterase 4 (CE4) superfamily. This family also includes many uncharacterized bacterial polysaccharide deacetylases.
Pssm-ID: 200580 [Multi-domain] Cd Length: 194 Bit Score: 42.71 E-value: 2.07e-04
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
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