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Annexin A1 interaction with a zwitterionic phospholipid monolayer: a fluorescence microscopy study
J Alfredo Freites1, Shahla Ali, Anja Rosengarth
1Department of Physics and Astronomy and Institute for Surface and Interface Science, University of California, Irvine, California 92697-4575, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 15, 2004
Summary
Annexin A1 protein interacts with lipid monolayers, forming networks at phase boundaries. Its organization at interfaces is influenced by the lipid domain structure, not pH.
Area of Science:
- Biophysics
- Protein-lipid interactions
- Surface science
Background:
- Annexin A1 is a calcium-binding protein involved in membrane processes.
- Lipid monolayers, such as dipalmitoylphosphatidylcholine (DPPC), serve as model systems for cell membranes.
Purpose of the Study:
- To investigate the interaction of annexin A1 with DPPC lipid monolayers.
- To determine how lipid monolayer phase and subphase pH affect this interaction.
Main Methods:
- Fluorescence microscopy was employed to visualize annexin A1.
- DPPC monolayers were studied under varying pH conditions.
Main Results:
- Annexin A1-DPPC interaction is highly dependent on the DPPC monolayer's domain structure.
- Annexin A1 exhibits line activity, preferentially adsorbing at phase boundaries.
- Annexin A1 forms network-like structures when domain structures are present in the monolayer.
- Subphase pH has a minimal effect on annexin A1-DPPC interactions.
Conclusions:
- The domain structure of lipid monolayers significantly influences annexin A1 organization.
- Annexin A1's N-terminal domain plays a crucial role in its interfacial organization.
- These findings provide insights into protein-membrane interactions at a molecular level.