Zinc peptidases M18, M20, M28, and M42; Zinc peptidases play vital roles in metabolic and ...
10-352
0e+00
Zinc peptidases M18, M20, M28, and M42; Zinc peptidases play vital roles in metabolic and signaling pathways throughout all kingdoms of life. This hierarchy contains zinc peptidases that correspond to the MH clan in the MEROPS database, which contains 4 families (M18, M20, M28, M42). The peptidase M20 family includes carboxypeptidases such as the glutamate carboxypeptidase from Pseudomonas, the thermostable carboxypeptidase Ss1 of broad specificity from archaea and yeast Gly-X carboxypeptidase. The dipeptidases include bacterial dipeptidase, peptidase V (PepV), a non-specific eukaryotic dipeptidase, and two Xaa-His dipeptidases (carnosinases). There is also the bacterial aminopeptidase, peptidase T (PepT) that acts only on tripeptide substrates and has therefore been termed a tripeptidase. Peptidase family M28 contains aminopeptidases and carboxypeptidases, and has co-catalytic zinc ions. However, several enzymes in this family utilize other first row transition metal ions such as cobalt and manganese. Each zinc ion is tetrahedrally co-ordinated, with three amino acid ligands plus activated water; one aspartate residue binds both metal ions. The aminopeptidases in this family are also called bacterial leucyl aminopeptidases, but are able to release a variety of N-terminal amino acids. IAP aminopeptidase and aminopeptidase Y preferentially release basic amino acids while glutamate carboxypeptidase II preferentially releases C-terminal glutamates. Glutamate carboxypeptidase II and plasma glutamate carboxypeptidase hydrolyze dipeptides. Peptidase families M18 and M42 contain metallo-aminopeptidases. M18 is widely distributed in bacteria and eukaryotes. However, only yeast aminopeptidase I and mammalian aspartyl aminopeptidase have been characterized in detail. Some M42 (also known as glutamyl aminopeptidase) enzymes exhibit aminopeptidase specificity while others also have acylaminoacyl-peptidase activity (i.e. hydrolysis of acylated N-terminal residues).
The actual alignment was detected with superfamily member TIGR03106:
Pssm-ID: 472712 [Multi-domain] Cd Length: 343 Bit Score: 585.17 E-value: 0e+00
hydrolase, peptidase M42 family; This model describes a subfamily of MEROPS peptidase family ...
10-352
0e+00
hydrolase, peptidase M42 family; This model describes a subfamily of MEROPS peptidase family M42, a glutamyl aminopeptidase family that also includes the cellulase CelM from Clostridium thermocellum and deblocking aminopeptidases that can remove acylated amino acids. Members of this family occur in a three gene cassette with an amidotransferase (TIGR03104)in the asparagine synthase (glutamine-hydrolyzing) family, and a probable acetyltransferase (TIGR03103) in the GNAT family.
Pssm-ID: 132150 [Multi-domain] Cd Length: 343 Bit Score: 585.17 E-value: 0e+00
M42 Peptidase, endoglucanase-like subfamily; Peptidase M42 family, glucanase (endo-1,4-beta-glucanase or endoglucanase)-like subfamily. Proteins in this subfamily are co-catalytic metallopeptidases, found in archaea and bacteria. They show similarity to cellulase and endo-1,4-beta-glucanase (endoglucanase) which typically bind two zinc or cobalt atoms. Some of the enzymes exhibit typical aminopeptidase specificity, whereas others are also capable of N-terminal deblocking activity, i.e. hydrolyzing acylated N-terminal residues. Many of these enzymes are assembled either as tetrahedral dodecamers or as octahedral tetracosameric structures, with the active site located on the inside such that substrate sizes are limited, indicating function as possible peptide scavengers.
Pssm-ID: 349907 [Multi-domain] Cd Length: 337 Bit Score: 465.21 E-value: 1.01e-164
M42 glutamyl aminopeptidase; These peptidases are found in Archaea and Bacteria. The example ...
55-343
2.83e-85
M42 glutamyl aminopeptidase; These peptidases are found in Archaea and Bacteria. The example in Lactococcus lactis, PepA, aids growth on milk. Pyrococcus horikoshii contain a thermostable de-blocking aminopeptidase member of this family used commercially for N-terminal protein sequencing.
Pssm-ID: 428431 [Multi-domain] Cd Length: 292 Bit Score: 261.35 E-value: 2.83e-85
hydrolase, peptidase M42 family; This model describes a subfamily of MEROPS peptidase family ...
10-352
0e+00
hydrolase, peptidase M42 family; This model describes a subfamily of MEROPS peptidase family M42, a glutamyl aminopeptidase family that also includes the cellulase CelM from Clostridium thermocellum and deblocking aminopeptidases that can remove acylated amino acids. Members of this family occur in a three gene cassette with an amidotransferase (TIGR03104)in the asparagine synthase (glutamine-hydrolyzing) family, and a probable acetyltransferase (TIGR03103) in the GNAT family.
Pssm-ID: 132150 [Multi-domain] Cd Length: 343 Bit Score: 585.17 E-value: 0e+00
M42 Peptidase, endoglucanase-like subfamily; Peptidase M42 family, glucanase (endo-1,4-beta-glucanase or endoglucanase)-like subfamily. Proteins in this subfamily are co-catalytic metallopeptidases, found in archaea and bacteria. They show similarity to cellulase and endo-1,4-beta-glucanase (endoglucanase) which typically bind two zinc or cobalt atoms. Some of the enzymes exhibit typical aminopeptidase specificity, whereas others are also capable of N-terminal deblocking activity, i.e. hydrolyzing acylated N-terminal residues. Many of these enzymes are assembled either as tetrahedral dodecamers or as octahedral tetracosameric structures, with the active site located on the inside such that substrate sizes are limited, indicating function as possible peptide scavengers.
Pssm-ID: 349907 [Multi-domain] Cd Length: 337 Bit Score: 465.21 E-value: 1.01e-164
M42 glutamyl aminopeptidase; These peptidases are found in Archaea and Bacteria. The example ...
55-343
2.83e-85
M42 glutamyl aminopeptidase; These peptidases are found in Archaea and Bacteria. The example in Lactococcus lactis, PepA, aids growth on milk. Pyrococcus horikoshii contain a thermostable de-blocking aminopeptidase member of this family used commercially for N-terminal protein sequencing.
Pssm-ID: 428431 [Multi-domain] Cd Length: 292 Bit Score: 261.35 E-value: 2.83e-85
M42 Peptidases, also known as glutamyl aminopeptidase family; Peptidase M42 family proteins, ...
18-347
5.92e-46
M42 Peptidases, also known as glutamyl aminopeptidase family; Peptidase M42 family proteins, also known as glutamyl aminopeptidases (GAP), are co-catalytic metallopeptidases, found in archaea and bacteria. They typically bind two zinc or cobalt atoms and include cellulase and endo-1,4-beta-glucanase (endoglucanase). Some of the enzymes exhibit typical aminopeptidase specificity, whereas others are also capable of N-terminal deblocking activity, i.e. hydrolyzing acylated N-terminal residues. GAP removes glutamyl residues from the N-terminus of peptide substrates, but is also effective against aspartyl and, to a lesser extent, seryl residues. Lactococcus lactis glutamyl aminopeptidase (PepA; aminopeptidase A) has high thermal stability and aids growth of the organism in milk. Pyrococcus horikoshii contain a thermostable de-blocking aminopeptidase member of this family, used commercially for N-terminal protein sequencing.
Pssm-ID: 193517 [Multi-domain] Cd Length: 332 Bit Score: 160.71 E-value: 5.92e-46
M42 Peptidase, endoglucanases; Peptidase M42 family, Frv (Frv Operon Protein; Endo-1 4-Beta-Glucanase; Cellulase Protein; Endoglucanase; Endo-1 4-Beta-Glucanase Homolog; Glucanase; EC. 3.2.1.4) subfamily. Frv is a co-catalytic metallopeptidase, found in archaea and bacteria, including Pyrococcus horikoshii tetrahedral shaped phTET1 (DAPPh1; FrvX; PhDAP aminopeptidase; PhTET aminopeptidase; deblocking aminopeptidase), phTET2 (DAPPh2) and phTET3 (DAPPh3), Haloarcula marismortui TET (HmTET) as well as Bacillus subtilis YsdC. All of these exhibit aminopeptidase and deblocking activities. The HmTET is a broad substrate aminopeptidase capable of degrading large peptides. PhTET2, which shares 24% identity with HmTET, is a cobalt-activated peptidase and possibly a deblocking aminopeptidase, assembled as a 12-subunit tetrahedral dodecamer, while PhTET1 can be alternatively assembled as a tetrahedral dodecamer or as an octahedral tetracosameric structure. The active site in such a self-compartmentalized complex is located on the inside such that substrate sizes are limited, indicating function as possible peptide scavengers. PhTET2 cleaves polypeptides by a nonprocessive mechanism, preferring N-terminal hydrophobic or uncharged polar amino acids. Streptococcus pneumoniae PepA (SpPepA) also forms dodecamer with tetrahedral architecture, and exhibits selective substrate specificity to acidic amino acids with the preference to glutamic acid, with the substrate binding S1 pocket containing an Arg allows electrostatic interactions with the N-terminal acidic residue in the substrate. The YsdC gene is conserved in a number of thermophiles, archaea and pathogenic bacterial species; the closest structural homolog is Thermotoga maritima FrwX (34% identity), which is annotated as either a cellulase or an endoglucanase, and is possibly involved in polysaccharide biosynthesis or degradation.
Pssm-ID: 349906 [Multi-domain] Cd Length: 337 Bit Score: 106.49 E-value: 8.68e-26
Acetylornithine deacetylase/Succinyl-diaminopimelate desuccinylase or related deacylase [Amino ...
18-78
4.29e-07
Acetylornithine deacetylase/Succinyl-diaminopimelate desuccinylase or related deacylase [Amino acid transport and metabolism]; Acetylornithine deacetylase/Succinyl-diaminopimelate desuccinylase or related deacylase is part of the Pathway/BioSystem: Arginine biosynthesis
Pssm-ID: 440389 [Multi-domain] Cd Length: 388 Bit Score: 51.42 E-value: 4.29e-07
M20 Peptidase acetylornithine deacetylase/acetyl-lysine deacetylase; Peptidase M20 family, acetylornithine deacetylase (ArgE)/acetyl-lysine deacetylase (LysK) subfamily. Proteins in this subfamily are mainly archaeal with related bacterial species and are deacetylases with specificity for both N-acetyl-ornithine and N-acetyl-lysine found within a lysine biosynthesis operon. ArgE catalyzes the conversion of N-acetylornithine to ornithine, while LysK, a homolog of ArgE, has deacetylating activities for both N-acetyllysine and N-acetylornithine at almost equal efficiency. These results suggest that LysK which may share an ancestor with ArgE functions not only for lysine biosynthesis, but also for arginine biosynthesis in species such as Thermus thermophilus. The substrate specificity of ArgE is quite broad in that several alpha-N-acyl-L-amino acids can be hydrolyzed, including alpha-N-acetylmethionine and alpha-N-formylmethionine. ArgE shares significant sequence homology and biochemical features, and possibly a common origin, with glutamate carboxypeptidase (CPG2) and succinyl-diaminopimelate desuccinylase (DapE), and aminoacylase I (ACY1), having all metal ligand binding residues conserved.
Pssm-ID: 349904 [Multi-domain] Cd Length: 343 Bit Score: 38.87 E-value: 3.86e-03
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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