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J. Biol. Chem., Vol. 265, Issue 31, 18907-18911, Nov, 1990

Refolding of an integral membrane protein. OmpA of Escherichia coli

K Dornmair, H Kiefer and F Jahnig
Max-Planck-Institut fur Biologie, Tubingen, West Germany.

OmpA is an integral membrane protein from the outer membrane of Escherichia coli. Purified, lipopolysaccharide-free OmpA was denatured by boiling in sodium dodecyl sulfate (SDS). Refolding was then induced by replacement of SDS with the nonionic detergent octylglucoside. The structure of both the denatured and refolded protein were investigated by SDS-gel electrophoresis, protease digestion, Raman and fluorescence spectroscopy. Refolded OmpA could be reconstituted into membranes of the synthetic lipid dimyristoylphosphatidylcholine. Thus, lipopolysaccharide is neither necessary for proper folding of OmpA nor for its insertion into lipid membranes. Based on this result, models for sorting of OmpA into the outer membrane of E. coli are discussed.
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