Structural and dynamical surface properties of phosphatidylethanolamine containing membranes

A. M. BOUCHET; M. A. FRÍAS; F. LAIRION; F. MARTINI; H. ALMALECK; G. GORDILLO; E. A. DISALVO

BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES

Elsevier

Año: 2009 vol. 1788 p. 918 - 925

0005-2736

Strong lateral interactions between NH3 and PO2 groups present in the solid PE´s remains when the lipids are fully hydrated, as it is derived from the shift in the asymmetric stretching frequency of the phosphate groups. The lateral head group interaction is a limiting factor for the hydration of the phosphate group and hinders the reorientation of the polar heads. The lower mobility is reflected in a higher energy to translocate the phosphoethanolamine (P-N) dipoles in an electrical field and in the lower adsorption of protein molecules from the solution.The energy absorbed in phosphoethanolamine monolayer is decreased in the presence of increasing ratios of PC´s of saturated chains. This result can be explained by an enhancement of the association of PC and PE in the membrane by the chain-chain interaction affecting the reorientation of the P-N groups, and hence the dipole potential.