Related Experiment Videos
A plant surface protein sharing structural properties with animal integrins
A Faik1, A M Labouré, D Gulino
1Laboratoire de Génétique Moléculaire des Plantes, UMR CNRS 5575, Université Joseph Fourier, CERMO, Grenoble, France.
European Journal of Biochemistry
|July 8, 1998
Summary
Researchers identified plant proteins structurally similar to human platelet integrin αIIbβ3. These findings suggest conserved functions of integrin-like proteins in plants and animals, impacting cell wall and plasma membrane interactions.
Area of Science:
- Plant biology
- Molecular biology
- Biochemistry
Background:
- Integrins are crucial cell surface receptors in animals, mediating cell adhesion and signaling.
- The presence and function of integrin-like proteins in plants remain largely unexplored.
- Plant cell wall and plasma membrane interactions are vital for cellular integrity and development.
Purpose of the Study:
- To investigate the presence and structural characteristics of plant proteins homologous to human platelet integrin αIIbβ3.
- To explore the potential functional similarities between plant and animal integrin complexes.
- To characterize novel antibodies for detecting plant integrin-like proteins.
Main Methods:
- Polyclonal antibody (P23) against human integrin αIIbβ3 used for immunofluorescence and Western blotting on plant protoplasts and glycoproteins.
- Immunoaffinity chromatography and SDS-PAGE to purify and analyze plant proteins.
- Competition assays with specific antibodies and synthetic peptides.
- Western blotting with antibodies against human integrin subunits and monoclonal antibody CS3.
- Characterization of a novel antibody (AcAt2) against plant glycoproteins.
Main Results:
- Fluorescence observed on protoplasts of Arabidopsis thaliana and Rubus fruticosus using anti-integrin antibody P23.
- Aberrant cell wall/plasma membrane organization in Arabidopsis cells treated with P23 and GRGDS peptide.
- Western blotting revealed plant glycoproteins recognized by P23, with distinct molecular masses under reduced and non-reduced conditions.
- Purified plant proteins showed similarities to animal integrin αIIbβ3, with two co-migrating polypeptides detected.
- Competition assays and immunoprecipitation with CS3 antibody confirmed structural similarities to the complexed animal integrin.
- A novel antibody, AcAt2, was characterized, specifically interacting with animal αIIbβ3 receptor.
Conclusions:
- Plant cells possess proteins structurally and antigenically related to the human platelet integrin αIIbβ3 complex.
- These plant integrin-like proteins may play roles in cell wall-plasma membrane interactions.
- The study provides novel tools and insights into conserved integrin functions across kingdoms.