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The bacterial porin superfamily: sequence alignment and structure prediction
D Jeanteur1, J H Lakey, F Pattus
1European Molecular Biology Laboratory, Heidelberg, Germany.
Molecular Microbiology
|September 1, 1991
Summary
Gram-negative bacteria outer membrane porins form channels for molecule diffusion. New methods accurately predict porin structure, revealing 16 membrane-spanning beta strands.
Area of Science:
- Microbiology
- Structural Biology
- Biochemistry
Background:
- Gram-negative bacteria possess an outer membrane crucial for cellular protection and nutrient uptake.
- Porins are integral outer membrane proteins forming water-filled channels that act as a molecular sieve.
- Conventional hydropathy methods fail to predict porin topology due to their hydrophilic nature and beta-strand secondary structure.
Purpose of the Study:
- To develop accurate prediction methods for bacterial porin membrane topology.
- To overcome limitations of traditional hydropathy analysis for porin structure prediction.
Main Methods:
- Exploited large datasets of porin amino acid sequences.
- Integrated secondary structure amphipathicity detection tools.
- Applied constraints of beta-sheet structure for topological prediction.
Main Results:
- Developed a novel prediction approach for porin membrane topology.
- Predicted porins contain 16 membrane-spanning strands.
- Identified 14 conserved strands across enteric and neisserial porin subfamilies.
Conclusions:
- The new prediction method accurately determines porin topology.
- Understanding porin structure is vital for bacterial outer membrane function.
- Conserved structural elements suggest conserved functions across porin families.