Table 8.

Substrate selectivities of bacterial outer membrane‚ÄČporins

Channel typeNo. identified
Nonselective9
Anions3
Phosphate2
Pyrophosphate1
Cations4
Heavy metals1
Nucleotides1
Nucleosides1
Monosaccharides1
Oligosaccharides2
Fatty acids1
Short-chain amides1
Urea1
Toluene1
Drugs1
Iron complexes2
Vitamins and cofactors2
Complex carbohydrates3
Proteins6