TonB-dependent receptor family protein may act as a channel to allow import of extracellular nutrients, such as iron-siderophore complexes or non-Fe compounds
Outer membrane protein beta-barrel family; This family includes proteins annotated as TonB ...
380-775
5.34e-76
Outer membrane protein beta-barrel family; This family includes proteins annotated as TonB dependent receptors. But it is also likely to contain other membrane beta barrel proteins of other functions.
:
Pssm-ID: 434300 [Multi-domain] Cd Length: 407 Bit Score: 252.19 E-value: 5.34e-76
CarboxypepD_reg-like domain; This domain family is found in bacteria, archaea and eukaryotes, ...
30-119
1.09e-12
CarboxypepD_reg-like domain; This domain family is found in bacteria, archaea and eukaryotes, and is approximately 90 amino acids in length. The family is found in association with pfam07715 and pfam00593.
:
Pssm-ID: 433425 [Multi-domain] Cd Length: 88 Bit Score: 64.15 E-value: 1.09e-12
Outer membrane protein beta-barrel family; This family includes proteins annotated as TonB ...
380-775
5.34e-76
Outer membrane protein beta-barrel family; This family includes proteins annotated as TonB dependent receptors. But it is also likely to contain other membrane beta barrel proteins of other functions.
Pssm-ID: 434300 [Multi-domain] Cd Length: 407 Bit Score: 252.19 E-value: 5.34e-76
TonB dependent/Ligand-Gated channels are created by a monomeric 22 strand (22,24) ...
150-777
4.56e-15
TonB dependent/Ligand-Gated channels are created by a monomeric 22 strand (22,24) anti-parallel beta-barrel. Ligands apparently bind to the large extracellular loops. The N-terminal 150-200 residues form a plug from the periplasmic end of barrel. Energy (proton-motive force) and TonB-dependent conformational alteration of channel (parts of plug, and loops 7 and 8) allow passage of ligand. FepA residues 12-18 form the TonB box, which mediates the interaction with the TonB-containing inner membrane complex. TonB preferentially interacts with ligand-bound receptors. Transport thru the channel may resemble passage thru an air lock. In this model, ligand binding leads to closure of the extracellular end of pore, then a TonB-mediated signal facillitates opening of the interior side of pore, deforming the N-terminal plug and allowing passage of the ligand to the periplasm. Such a mechanism would prevent the free diffusion of small molecules thru the pore.
Pssm-ID: 238657 [Multi-domain] Cd Length: 635 Bit Score: 79.03 E-value: 4.56e-15
CarboxypepD_reg-like domain; This domain family is found in bacteria, archaea and eukaryotes, ...
30-119
1.09e-12
CarboxypepD_reg-like domain; This domain family is found in bacteria, archaea and eukaryotes, and is approximately 90 amino acids in length. The family is found in association with pfam07715 and pfam00593.
Pssm-ID: 433425 [Multi-domain] Cd Length: 88 Bit Score: 64.15 E-value: 1.09e-12
TonB-dependent receptor; This model represents a family of TonB-dependent outer-membrane ...
212-592
3.13e-05
TonB-dependent receptor; This model represents a family of TonB-dependent outer-membrane receptors which are found mainly in Xanthomonas and Caulobacter. These appear to represent the expansion of a paralogous family in that the 22 X. axonopodis (21 in X. campestris) and 18 C. crescentus sequences are more closely related to each other than any of the many TonB-dependent receptors found in other species. In fact, the Crescentus and Xanthomonas sequences are inseparable on a phylogenetic tree using a PAM-weighted neighbor-joining method, indicating that one of the two genuses may have acquired this set of receptors from the other. The mechanism by which this family is shared between Xanthomonas, a gamma proteobacterial plant pathogen and Caulobacter, an alpha proteobacterial aquatic organism is unclear. [Transport and binding proteins, Porins]
Pssm-ID: 273804 [Multi-domain] Cd Length: 845 Bit Score: 47.71 E-value: 3.13e-05
Outer membrane protein beta-barrel family; This family includes proteins annotated as TonB ...
380-775
5.34e-76
Outer membrane protein beta-barrel family; This family includes proteins annotated as TonB dependent receptors. But it is also likely to contain other membrane beta barrel proteins of other functions.
Pssm-ID: 434300 [Multi-domain] Cd Length: 407 Bit Score: 252.19 E-value: 5.34e-76
TonB dependent/Ligand-Gated channels are created by a monomeric 22 strand (22,24) ...
150-777
4.56e-15
TonB dependent/Ligand-Gated channels are created by a monomeric 22 strand (22,24) anti-parallel beta-barrel. Ligands apparently bind to the large extracellular loops. The N-terminal 150-200 residues form a plug from the periplasmic end of barrel. Energy (proton-motive force) and TonB-dependent conformational alteration of channel (parts of plug, and loops 7 and 8) allow passage of ligand. FepA residues 12-18 form the TonB box, which mediates the interaction with the TonB-containing inner membrane complex. TonB preferentially interacts with ligand-bound receptors. Transport thru the channel may resemble passage thru an air lock. In this model, ligand binding leads to closure of the extracellular end of pore, then a TonB-mediated signal facillitates opening of the interior side of pore, deforming the N-terminal plug and allowing passage of the ligand to the periplasm. Such a mechanism would prevent the free diffusion of small molecules thru the pore.
Pssm-ID: 238657 [Multi-domain] Cd Length: 635 Bit Score: 79.03 E-value: 4.56e-15
CarboxypepD_reg-like domain; This domain family is found in bacteria, archaea and eukaryotes, ...
30-119
1.09e-12
CarboxypepD_reg-like domain; This domain family is found in bacteria, archaea and eukaryotes, and is approximately 90 amino acids in length. The family is found in association with pfam07715 and pfam00593.
Pssm-ID: 433425 [Multi-domain] Cd Length: 88 Bit Score: 64.15 E-value: 1.09e-12
TonB-dependent receptor; This model represents a family of TonB-dependent outer-membrane ...
212-592
3.13e-05
TonB-dependent receptor; This model represents a family of TonB-dependent outer-membrane receptors which are found mainly in Xanthomonas and Caulobacter. These appear to represent the expansion of a paralogous family in that the 22 X. axonopodis (21 in X. campestris) and 18 C. crescentus sequences are more closely related to each other than any of the many TonB-dependent receptors found in other species. In fact, the Crescentus and Xanthomonas sequences are inseparable on a phylogenetic tree using a PAM-weighted neighbor-joining method, indicating that one of the two genuses may have acquired this set of receptors from the other. The mechanism by which this family is shared between Xanthomonas, a gamma proteobacterial plant pathogen and Caulobacter, an alpha proteobacterial aquatic organism is unclear. [Transport and binding proteins, Porins]
Pssm-ID: 273804 [Multi-domain] Cd Length: 845 Bit Score: 47.71 E-value: 3.13e-05
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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