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On the transfer of integral proteins into membranes.

We have earlier proposed a molecular mechanism for the translocation of hydrophilic proteins across membranes that accounts for the experimental facts and meets the restrictions that we stipulate for such a mechanism. In particular, the restrictions are that translocation occurs by successive segments of the polypeptide chain and that the ionic groups of the polypeptide remain in contact with water throughout the translocation process. The evidence indicates that the transfer of integral proteins into membranes very likely uses the same molecular machinery as does the translocation of hydrophilic proteins across membranes. Here we show how the mechanism we have proposed for translocation can also be utilized in the intercalation of known types of integral proteins, accounting for their specific topologies in the membrane.