LD-Carboxypeptidase, a serine protease, includes microcin C7 self immunity protein; ...
13-286
4.29e-123
LD-Carboxypeptidase, a serine protease, includes microcin C7 self immunity protein; LD-carboxypeptidase (Muramoyltetrapeptide carboxypeptidase; EC 3.4.17.13; Merops family S66; initially described as Carboxypeptidase II) family also includes the microcin c7 self-immunity protein (MccF) as well as uncharacterized proteins including hypothetical proteins. LD-carboxypeptidase hydrolyzes the amide bond that links the dibasic amino acids to C-terminal D-amino acids. The physiological substrates of LD-carboxypeptidase are tetrapeptide fragments (such as UDP-MurNAc-tetrapeptides) that are produced when bacterial cell walls are degraded; they contain an L-configured residue (L-lysine or meso-diaminopimelic acid residue) as the penultimate residue and D-alanine as the ultimate residue. A possible role of LD-carboxypeptidase is in peptidoglycan recycling whereby the resulting tripeptide (precursor for murein synthesis) can be reconverted into peptidoglycan by attachment of preformed D-Ala-D-Ala dipeptides. Some enzymes possessing LD-carboxypeptidase activity also act as LD-transpeptidase by replacing the terminal D-Ala with another D-amino acid. MccF contributes to self-immunity towards microcin C7 (MccC7), a ribosomally encoded peptide antibiotic that contains a phosphoramidate linkage to adenosine monophosphate at its C-terminus. Its possible biological role is to defend producer cells against exogenous microcin from re-entering after having been exported. It is suggested that MccF is involved in microcin degradation or sequestration in the periplasm.
Pssm-ID: 132882 [Multi-domain] Cd Length: 282 Bit Score: 353.41 E-value: 4.29e-123
LD-carboxypeptidase N-terminal domain; Muramoyl-tetrapeptide carboxypeptidase hydrolyses a ...
13-129
2.11e-54
LD-carboxypeptidase N-terminal domain; Muramoyl-tetrapeptide carboxypeptidase hydrolyses a peptide bond between a di-basic amino acid and the C-terminal D-alanine in the tetrapeptide moiety in peptidoglycan. This cleaves the bond between an L- and a D-amino acid. The function of this activity is in murein recycling. This family also includes the microcin c7 self-immunity protein Swiss:Q47511. This family corresponds to Merops family S66.
Pssm-ID: 460412 [Multi-domain] Cd Length: 119 Bit Score: 172.67 E-value: 2.11e-54
LD-Carboxypeptidase, a serine protease, includes microcin C7 self immunity protein; ...
13-286
4.29e-123
LD-Carboxypeptidase, a serine protease, includes microcin C7 self immunity protein; LD-carboxypeptidase (Muramoyltetrapeptide carboxypeptidase; EC 3.4.17.13; Merops family S66; initially described as Carboxypeptidase II) family also includes the microcin c7 self-immunity protein (MccF) as well as uncharacterized proteins including hypothetical proteins. LD-carboxypeptidase hydrolyzes the amide bond that links the dibasic amino acids to C-terminal D-amino acids. The physiological substrates of LD-carboxypeptidase are tetrapeptide fragments (such as UDP-MurNAc-tetrapeptides) that are produced when bacterial cell walls are degraded; they contain an L-configured residue (L-lysine or meso-diaminopimelic acid residue) as the penultimate residue and D-alanine as the ultimate residue. A possible role of LD-carboxypeptidase is in peptidoglycan recycling whereby the resulting tripeptide (precursor for murein synthesis) can be reconverted into peptidoglycan by attachment of preformed D-Ala-D-Ala dipeptides. Some enzymes possessing LD-carboxypeptidase activity also act as LD-transpeptidase by replacing the terminal D-Ala with another D-amino acid. MccF contributes to self-immunity towards microcin C7 (MccC7), a ribosomally encoded peptide antibiotic that contains a phosphoramidate linkage to adenosine monophosphate at its C-terminus. Its possible biological role is to defend producer cells against exogenous microcin from re-entering after having been exported. It is suggested that MccF is involved in microcin degradation or sequestration in the periplasm.
Pssm-ID: 132882 [Multi-domain] Cd Length: 282 Bit Score: 353.41 E-value: 4.29e-123
Microcin C7 self-immunity protein determines resistance to exogenous microcin C7; Microcin C7 ...
11-287
7.03e-79
Microcin C7 self-immunity protein determines resistance to exogenous microcin C7; Microcin C7 self-immunity protein (mccF): MccF, a homolog of the LD-carboxypeptidase family, mediates resistance against exogenously added microcin C7 (MccC7), a ribosomally-encoded peptide antibiotic that contains a phosphoramidate linkage to adenosine monophosphate at its C-terminus. The plasmid-encoded mccF gene is transcribed in the opposite direction to the other five genes (mccA-E) and is required for the full expression of immunity but not for production. The catalytic triad residues (Ser, His, Glu) of LD-carboxypeptidase are also conserved in MccF, strongly suggesting that MccF shares the hydrolytic activity with LD-carboxypeptidases. Substrates of MccF have not been deduced, but could likely be microcin C7 precursors. The possible role of MccF is to defend producer cells against exogenous microcin from re-entering after having been exported. It is suggested that MccF is involved in microcin degradation or sequestration in the periplasm.
Pssm-ID: 132883 [Multi-domain] Cd Length: 308 Bit Score: 242.09 E-value: 7.03e-79
LD-carboxypeptidase N-terminal domain; Muramoyl-tetrapeptide carboxypeptidase hydrolyses a ...
13-129
2.11e-54
LD-carboxypeptidase N-terminal domain; Muramoyl-tetrapeptide carboxypeptidase hydrolyses a peptide bond between a di-basic amino acid and the C-terminal D-alanine in the tetrapeptide moiety in peptidoglycan. This cleaves the bond between an L- and a D-amino acid. The function of this activity is in murein recycling. This family also includes the microcin c7 self-immunity protein Swiss:Q47511. This family corresponds to Merops family S66.
Pssm-ID: 460412 [Multi-domain] Cd Length: 119 Bit Score: 172.67 E-value: 2.11e-54
LD-carboxypeptidase C-terminal domain; Muramoyl-tetrapeptide carboxypeptidase hydrolyses a ...
173-287
3.08e-48
LD-carboxypeptidase C-terminal domain; Muramoyl-tetrapeptide carboxypeptidase hydrolyses a peptide bond between a di-basic amino acid and the C-terminal D-alanine in the tetrapeptide moiety in peptidoglycan. This cleaves the bond between an L- and a D-amino acid. The function of this activity is in murein recycling. This family also includes the microcin c7 self-immunity protein Swiss:Q47511. This family corresponds to Merops family S66.
Pssm-ID: 465453 Cd Length: 120 Bit Score: 156.94 E-value: 3.08e-48
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.
of the residues that compose this conserved feature have been mapped to the query sequence.
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