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. 1987 Jun 1;244(2):295–301. doi: 10.1042/bj2440295

Interactions of ovalbumin and of its putative signal sequence with phospholipid monolayers. Possible importance of differing lateral stabilities in protein translocation.

G D Fidelio 1, B M Austen 1, D Chapman 1, J A Lucy 1
PMCID: PMC1147990  PMID: 3663123

Abstract

Surface properties of ovalbumin and of its putative signal sequence, and their interactions with phospholipids at an air-water interface, have been studied. The mature protein can form an interfacial film spontaneously from its bulk solution, whereas the signal sequence cannot. Mature ovalbumin also penetrates phospholipid monolayers from the subphase (independently of the type of phospholipid present), whereas its signal sequence does not. The surface stability of a spread film of the signal sequence is, however, higher than that of a film of mature ovalbumin. Above specific threshold concentrations of signal peptide and of mature ovalbumin in mixed films with phospholipids, two separate phases are formed. In such immiscible films, the signal sequence peptide is also able to support a higher lateral surface pressure than mature ovalbumin, at corresponding areas of peptide and mature protein in the mixed monolayers. It is suggested that the differing lateral stabilities of ovalbumin and of its putative signal sequence may be relevant to the translocation of ovalbumin across the membrane of the endoplasmic reticulum, and a scheme for its translocation is proposed that is based on these properties.

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Selected References

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