Characterization of the Interaction Between Annexin I and Profilin
| Autor: | Jean Pierre Liautard, Joannes Sri Widada, Jean-Claude Mani, Maria-Teresa Alvarez-Martinez, Catherine Faivre-Sarrailh, Françoise Porte |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Protein Denaturation
chemistry.chemical_element Biosensing Techniques macromolecular substances Calcium Biology Binding Competitive Promethazine Biochemistry law.invention Profilins chemistry.chemical_compound Contractile Proteins law Surface plasmon resonance Cytoskeleton Actin Annexin A1 Microfilament Proteins Actins Cell biology Phosphotransferases (Alcohol Group Acceptor) Phosphatidylinositol 4 5-bisphosphate chemistry Profilin Recombinant DNA biology.protein Biological Assay Electrophoresis Polyacrylamide Gel Annexin A2 |
| Zdroj: | European Journal of Biochemistry. 238:777-784 |
| ISSN: | 1432-1033 0014-2956 |
| DOI: | 10.1111/j.1432-1033.1996.0777w.x |
| Popis: | Annexin I belongs to a family of calcium-dependent phospholipid-binding and membrane-binding proteins. Although many of the biochemical properties and the three-dimensional structure of this protein are known, its true physiological roles have yet to be thoroughly defined. Its putative functions include participation in the regulation of actin microfilaments dynamics, proposed after the discovery of an interaction with actin. In accordance with this hypothesis, we found that annexin I can also interact with profilin. We used different methods, overlay and surface plasmon resonance (BIAcore), to measure the parameters of the association equilibrium, i.e. k(on), k(off) and k(d). The affinity of annexin I for profilin was between 10(7) M and 10(8) M. High concentrations of KCl did not prevent the interaction, although a slight decrease in affinity was observed. Calcium, a modulator of annexin I functions interfered only marginally with the association, in a manner comparable to magnesium. Proteins or compounds known to interact with annexin I or profilin were found to inhibit the annexin-I--profilin interaction when added in the reaction medium. Recombinant profilin exhibited a slightly lower affinity than natural platelet protein when measured with BIAcore. Due to the submembrane localisation of annexin I and the regulatory activity of profilin on the cytoskeleton, an interaction between annexin I and profilin may therefore be implicated in the regulation of some cellular functions, particularly those governing membrane-cytoskeleton dynamic organization. |
| Databáze: | OpenAIRE |
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