The resolution of membrane proteins based upon size, charge, and hydrophobicity.
Currently available systems for resolving membrane proteins are based only on size and charge differences. Recently, it has been shown that Triton-urea-acetic acid gels which separate proteins on the basis of charge, size and hydrophobicity are capable of resolving proteins differing only by the substitution of a single neutral amino acid. We have applied this new method to the resolution of bacterial envelope proteins. Conditions for optimal resolution of different bacterial envelope proteins were determined by electrophoresis through transverse urea and Triton X-100 gradient gels. We have also correlated the components resolved in this system with those resolved by classical sodium dodecyl sulfate-gel electrophoresis by using two-dimensional slab gels combining the two systems. Furthermore, envelope protein fractions from different species and strains of bacteria were compared to identify specific proteins. This system appears to be a promising method for investigating envelope proteins which are due to missense mutations.
Fernandes
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PB
Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, USA.
Nardi
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RV
Franklin
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SG
D019342:Acetic Acid; D001426:Bacterial Proteins / Q000737:chemistry / Q000302:isolation & purification; D004563:Electrochemistry; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods; D008565:Membrane Proteins / Q000737:chemistry* / Q000302:isolation & purification*; D008970:Molecular Weight; D017830:Octoxynol; D012967:Sodium Dodecyl Sulfate; D012995:Solubility; D014508:Urea
D001426:Bacterial Proteins; D008565:Membrane Proteins; D012967:Sodium Dodecyl Sulfate; D014508:Urea; D017830:Octoxynol; D019342:Acetic Acid