Ntn (N-terminal nucleophile) hydrolase family protein is activated autocatalytically via an N-terminally located nucleophilic amino acid, and may catalyze the hydrolysis of amide bonds in either protein or small molecule substrates
The Ntn hydrolases (N-terminal nucleophile) are a diverse superfamily of of enzymes that are ...
1-284
1.44e-60
The Ntn hydrolases (N-terminal nucleophile) are a diverse superfamily of of enzymes that are activated autocatalytically via an N-terminally lcated nucleophilic amino acid. N-terminal nucleophile (NTN-) hydrolase superfamily, which contains a four-layered alpha, beta, beta, alpha core structure. This family of hydrolases includes penicillin acylase, the 20S proteasome alpha and beta subunits, and glutamate synthase. The mechanism of activation of these proteins is conserved, although they differ in their substrate specificities. All known members catalyze the hydrolysis of amide bonds in either proteins or small molecules, and each one of them is synthesized as a preprotein. For each, an autocatalytic endoproteolytic process generates a new N-terminal residue. This mature N-terminal residue is central to catalysis and acts as both a polarizing base and a nucleophile during the reaction. The N-terminal amino group acts as the proton acceptor and activates either the nucleophilic hydroxyl in a Ser or Thr residue or the nucleophilic thiol in a Cys residue. The position of the N-terminal nucleophile in the active site and the mechanism of catalysis are conserved in this family, despite considerable variation in the protein sequences.
The actual alignment was detected with superfamily member cd00542:
Pssm-ID: 469781 Cd Length: 303 Bit Score: 195.13 E-value: 1.44e-60
Penicillin V acylase (PVA), also known as conjugated bile salt acid hydrolase (CBAH), ...
1-284
1.44e-60
Penicillin V acylase (PVA), also known as conjugated bile salt acid hydrolase (CBAH), catalyzes the hydrolysis of penicillin V to yield 6-amino penicillanic acid (6-APA), an important key intermediate of semisynthetic penicillins. PVA has an N-terminal nucleophilic cysteine, as do other members of the Ntn hydrolase family to which PVA belongs. This nucleophilic cysteine is exposed by post-translational prossessing of the PVA precursor. PVA forms a homotetramer.
Pssm-ID: 238303 Cd Length: 303 Bit Score: 195.13 E-value: 1.44e-60
Linear amide C-N hydrolases, choloylglycine hydrolase family; This family includes several ...
1-284
8.94e-49
Linear amide C-N hydrolases, choloylglycine hydrolase family; This family includes several hydrolases which cleave carbon-nitrogen bonds, other than peptide bonds, in linear amides. These include choloylglycine hydrolase (conjugated bile acid hydrolase, CBAH) EC:3.5.1.24, penicillin acylase EC:3.5.1.11 and acid ceramidase EC:3.5.1.23. This domain forms the alpha-subunit for members from vertebral species, see family NAAA-beta, pfam15508.
Pssm-ID: 396726 Cd Length: 316 Bit Score: 164.99 E-value: 8.94e-49
Penicillin V acylase (PVA), also known as conjugated bile salt acid hydrolase (CBAH), ...
1-284
1.44e-60
Penicillin V acylase (PVA), also known as conjugated bile salt acid hydrolase (CBAH), catalyzes the hydrolysis of penicillin V to yield 6-amino penicillanic acid (6-APA), an important key intermediate of semisynthetic penicillins. PVA has an N-terminal nucleophilic cysteine, as do other members of the Ntn hydrolase family to which PVA belongs. This nucleophilic cysteine is exposed by post-translational prossessing of the PVA precursor. PVA forms a homotetramer.
Pssm-ID: 238303 Cd Length: 303 Bit Score: 195.13 E-value: 1.44e-60
Linear amide C-N hydrolases, choloylglycine hydrolase family; This family includes several ...
1-284
8.94e-49
Linear amide C-N hydrolases, choloylglycine hydrolase family; This family includes several hydrolases which cleave carbon-nitrogen bonds, other than peptide bonds, in linear amides. These include choloylglycine hydrolase (conjugated bile acid hydrolase, CBAH) EC:3.5.1.24, penicillin acylase EC:3.5.1.11 and acid ceramidase EC:3.5.1.23. This domain forms the alpha-subunit for members from vertebral species, see family NAAA-beta, pfam15508.
Pssm-ID: 396726 Cd Length: 316 Bit Score: 164.99 E-value: 8.94e-49
Choloylglycine hydrolase (CGH)_like. This family of choloylglycine hydrolase-like proteins ...
1-186
6.34e-37
Choloylglycine hydrolase (CGH)_like. This family of choloylglycine hydrolase-like proteins includes conjugated bile acid hydrolase (CBAH), penicillin V acylase (PVA), acid ceramidase (AC), and N-acylethanolamine-hydrolyzing acid amidase (NAAA) which cleave non-peptide carbon-nitrogen bonds in bile salt constituents. These enzymes have an N-terminal nucleophilic cysteine, as do other members of the Ntn hydrolase family to which they belong. This nucleophilic cysteine is exposed by post-translational prossessing of the precursor protein.
Pssm-ID: 238910 Cd Length: 229 Bit Score: 131.71 E-value: 6.34e-37
Choloylglycine hydrolase (CGH) is a bile salt-modifying enzyme that hydrolyzes non-peptide ...
6-299
8.02e-10
Choloylglycine hydrolase (CGH) is a bile salt-modifying enzyme that hydrolyzes non-peptide carbon-nitrogen bonds in choloylglycine and choloyltaurine, both of which are present in bile. CGH is present in a number of probiotic microbial organisms that inhabit the gut. CGH has an N-terminal nucleophilic cysteine, as do other members of the Ntn hydrolase family to which CGH belongs.
Pssm-ID: 238885 Cd Length: 291 Bit Score: 58.50 E-value: 8.02e-10
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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