Porins form aqueous channels for the diffusion of small hydrophillic molecules across the ...
30-364
5.75e-54
Porins form aqueous channels for the diffusion of small hydrophillic molecules across the outer membrane. Individual 16-strand anti-parallel beta-barrels form a central pore, and trimerizes thru mainly hydrophobic interactions at the interface. Trimers are stabilized by hytrophillic clamping of Loop L2. Loop 3 bends into the pore, creating an elliptical constriction of about 7 x 11A, large enough to allow passage of a glucose molecule without steric hindrance. Removal of the C-terminal residue (usuallly F) destabilizes the trimer and removal of the 16th beta-sheet abolishes trimerization. Unlike typical membrane proteins, porins lack long hydrophobic stretches. Short turns are found at the smooth, periplasmic end, longer irregular loops are found at the rough, extracellular end. C-terminal residue forms salt bridge with N-terminus.
Pssm-ID: 238208 [Multi-domain] Cd Length: 329 Bit Score: 180.65 E-value: 5.75e-54
Porins form aqueous channels for the diffusion of small hydrophillic molecules across the ...
30-364
5.75e-54
Porins form aqueous channels for the diffusion of small hydrophillic molecules across the outer membrane. Individual 16-strand anti-parallel beta-barrels form a central pore, and trimerizes thru mainly hydrophobic interactions at the interface. Trimers are stabilized by hytrophillic clamping of Loop L2. Loop 3 bends into the pore, creating an elliptical constriction of about 7 x 11A, large enough to allow passage of a glucose molecule without steric hindrance. Removal of the C-terminal residue (usuallly F) destabilizes the trimer and removal of the 16th beta-sheet abolishes trimerization. Unlike typical membrane proteins, porins lack long hydrophobic stretches. Short turns are found at the smooth, periplasmic end, longer irregular loops are found at the rough, extracellular end. C-terminal residue forms salt bridge with N-terminus.
Pssm-ID: 238208 [Multi-domain] Cd Length: 329 Bit Score: 180.65 E-value: 5.75e-54
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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Functional characterization of the conserved domain architecture found on the query.
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This image shows a graphical summary of conserved domains identified on the query sequence.
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if a domain or superfamily has been annotated with functional sites (conserved features),
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The table lists conserved domains identified on the query sequence. Click on the plus sign (+) on the left to display full descriptions, alignments, and scores.
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Concise Display shows only the best scoring domain model, in each hit category listed below except non-specific hits, for each region on the query sequence.
(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
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(labeled illustration) Four types of hits can be shown, as available,
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specific hits meet or exceed a domain-specific e-value threshold
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and represent a very high confidence that the query sequence belongs to the same protein family as the sequences use to create the domain model
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the domain superfamily to which the specific and non-specific hits belong
multi-domain models that were computationally detected and are likely to contain multiple single domains
Retrieve proteins that contain one or more of the domains present in the query sequence, using the Conserved Domain Architecture Retrieval Tool
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