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Two-dimensional reference map of Agrobacterium tumefaciens proteins.
Ran Rosen1, Ayelet Sacher, Nelia Shechter
1Department of Molecular Microbiology and Biotechnology, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Israel.
Proteomics
|March 30, 2004
Summary
This study presents a comprehensive proteomic reference map for Agrobacterium tumefaciens, identifying over 300 proteins. The research reveals unique protein characteristics and highlights the prevalence of post-translational modifications in this bacterial pathogen.
Area of Science:
- Bacteriology
- Proteomics
- Molecular Biology
Background:
- Two-dimensional (2-D) gel electrophoresis and mass spectrometry are standard proteomics techniques for physiological studies.
- Physiological proteomics necessitates well-established 2-D reference maps with identified proteins.
Purpose of the Study:
- To create a detailed 2-D reference map for Agrobacterium tumefaciens proteins.
- To quantitatively analyze protein profiles and compare them with theoretical predictions.
Main Methods:
- Development of a 2-D reference map for Agrobacterium tumefaciens proteome.
- Mass spectrometry for protein spot identification.
- Theoretical analysis of protein parameters (molecular weight and isoelectric point).
Main Results:
- A reference map with over 300 identified Agrobacterium tumefaciens proteins (pI 4-7) was generated.
- Quantitative analysis revealed unique protein features compared to other bacteria.
- Discrepancies between theoretical and experimental protein parameters indicated post-translational modifications in over 10% of soluble proteins.
Conclusions:
- The established reference map serves as a crucial tool for Agrobacterium tumefaciens physiological proteomics.
- Post-translational modifications are common in Agrobacterium tumefaciens soluble proteins, influencing their migration patterns.
- The study provides insights into the complexity of the Agrobacterium tumefaciens proteome.