Induction of non-bilayer lipid structures by functional signal peptides.

AUTOR(ES)

Killian, J A

RESUMO

Using 31P NMR and freeze-fracture electron microscopy we investigated the effect of several synthetic signal peptides on lipid structure in model membranes mimicking the lipid composition of the Escherichia coli inner membrane. It is demonstrated that the signal peptide of the E. coli outer membrane protein PhoE, as well as that of the M13 phage coat protein, strongly promote the formation of non-bilayer lipid structures. This effect appears to be correlated to in vivo translocation efficiency, since a less functional analogue of the PhoE signal peptide was found to be less active in destabilizing the bilayer. It is proposed that signal sequences can induce local changes in lipid structure that are involved in protein translocation across the membrane.

Documentos Relacionados

• Lepromatous leprosy patients produce antibodies that recognise non-bilayer lipid arrangements containing mycolic acids
• Self-assembly of large, ordered lamellae from non-bilayer lipids and integral membrane proteins in vitro
• Non-bilayer lipids are required for efficient protein transport across the plasma membrane of Escherichia coli.
• Bayliss-Starling Memorial Lecture (1982). Induction of sleep by muramyl peptides.
• Theory of periodic structures in lipid bilayer membranes