Abstract
The influence of the linear polypeptide gramicidin A’ (GA’) on the dynamics of the main phase transition in single shell DPPC vesicles was investigated in equilibrium and kinetic measurements. Additional experiments were carried out with vesicles containing low amounts of the synthetic polypeptide Iys2–gly-leu24–lys2–ala-amide. Turbidity measurements showed a broadening of the phase transition for both polypeptides and a hysteresis in the transition curves. DSC peaks indicated that at least two types of lipids coexist for DPPC-GA’ vesicles in the concentration range 0.02 ≤ X(GA’) ≤ 0.04. The transition enthalpy was decreasing linearly for both polypeptides in the investigated concentration range. Kinetic experiments were performed on our iodine-laser T-jump arrangement (ILTJ) using turbidity detection. In the region of the main phase transition an increasing percentage of the overall turbidity change was shifted from the ms to the µs time range when increasing amounts of polypeptides were present in the phospholipid bilayer. We conclude that domains containing lipids of different order (clusters) as they are assumed to coexist in pure DPPC bilayers become much less important if polypeptides are incorporated.
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Abbreviations
- DMPC:
-
Dimyristoylphosphatidylcholine
- DPPC:
-
Dipalmytoyiphosphatidylcholine
- GA’:
-
Gramicidin A’
- PP:
-
Lys2–Gly-Leu24–Lys2–Ala-amide
- ILTJ:
-
Iodine-Laser-Tempeiaiure-Jump
- DSC:
-
Differential Scanning Calorimetry
- NMR:
-
Nuclear Magnetic Resonance
- ΔH:
-
Enthalpy of the Phase Transition
- CD:
-
Circular Dichroism
- Tm :
-
Temperature of the Main Phase Transition Midpoint
- Ala:
-
Alanine
- Gly:
-
Glycine
- Lau:
-
Leucine
- Lys:
-
Lysine
- Trp:
-
Tryptothan
- Val:
-
Valine
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Genz, A., Tsong, T.Y., Holzwarth, J.F. (1990). Equilibrium and Dynamic Investigation on the Main Phase Transition of Dipalmytoylphosphatidylcholine Vesicles Containing Polypeptides: A DSC and Iodine Laser T-Jump Study. In: Bloor, D.M., Wyn-Jones, E. (eds) The Structure, Dynamics and Equilibrium Properties of Colloidal Systems. NATO ASI Series, vol 324. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3746-1_32
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DOI: https://doi.org/10.1007/978-94-011-3746-1_32
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