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The plant cytolytic protein enterolobin assumes a dimeric structure in solution
Silvia E T Bittencourt1, Luciano P Silva, Ricardo B Azevedo
1Brazilian Center for Protein Research, Department of Cell Biology, University of Brasília, 70910-900, Brasília, Brazil.
FEBS Letters
|August 14, 2003
Summary
Enterolobin, a plant protein, forms a dimer in solution, similar to bacterial aerolysin. This dimeric structure was confirmed using various biochemical and biophysical methods, including atomic force microscopy.
Area of Science:
- Biochemistry
- Biophysics
- Structural Biology
Background:
- Enterolobin is a plant cytolytic protein.
- It shares similarities with the bacterial cytolysin aerolysin.
- The oligomeric state of enterolobin in solution is not well-characterized.
Purpose of the Study:
- To investigate the solution structure of enterolobin.
- To determine if enterolobin, like aerolysin, forms a dimeric structure.
- To characterize the oligomeric state of enterolobin using biochemical and biophysical techniques.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE)
- Gel filtration chromatography
- Electrospray mass spectrometry (ESI-MS)
- Atomic force microscopy (AFM)
- In silico docking
Main Results:
- SDS-PAGE indicated the presence of enterolobin monomers, dimers, and oligomers.
- Gel filtration and ESI-MS revealed a preference for enterolobin dimerization in solution.
- AFM visualized enterolobin dimer assemblies at low concentrations (10 microg/ml).
- In silico modeling supported the observed dimer structure.
Conclusions:
- Enterolobin predominantly exists as a dimer in solution.
- The dimeric structure of enterolobin is consistent with that of aerolysin.
- AFM and computational modeling provide structural insights into enterolobin dimerization.