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Separation and Fractionation of Cell Wall and Cell Membrane Proteins from Mycobacterium tuberculosis for Downstream Protein Analysis
Published on: September 26, 2025
Proteome-scale identification of outer membrane proteins in Mycobacterium avium subspecies paratuberculosis using a
Aarti Rana1, Abdur Rub, Yusuf Akhter
1School of Life Sciences, Central University of Himachal Pradesh, Temporary Academic Block, Shahpur, District-Kangra, Himachal Pradesh 176206, India. yusuf.akhter@gmail.com yusuf@daad-alumni.de.
Abstract:
Outer membrane proteins (OMPs) in eubacteria have several important roles, which range from membrane transport to the host-pathogen interactions. These are directly involved in pathogen attachment, entry and activation of several pathogen-induced signaling cascades in the cell. The cardinal structural features of OMPs include the presence of a β-barrel, a signal peptide and the absence of the transmembrane helix. This is the first report on proteome-wide identification of OMPs of ruminant pathogen, Mycobacterium avium subsp. paratuberculosis (MAP). The complete proteome of MAP was analyzed using a pipeline of algorithms, which screens the amino acid sequences and structural features shared by OMPs in other bacteria. Secondary structure of these proteins is also analyzed and scores are calculated for amphiphilic β-strands. From the set of 588 exported proteins, 264 proteins are predicted to be inner membrane proteins while 83 proteins are identified as potential OMPs in MAP. Finally, this study identified 57 proteins as top candidates, on the basis of computed isoelectric points, as the core set of OMPs. Significantly, the resulting data for OMPs are not only useful in designing novel vaccines but may also open avenues for the development of early serodiagnostic tools for MAP.
Insights
This study identifies 57 outer membrane proteins (OMPs) in Mycobacterium avium subsp. paratuberculosis (MAP), a ruminant pathogen. These identified OMPs are crucial for developing new vaccines and diagnostic tools for MAP infections.
Area of Science:
- Microbiology
- Proteomics
- Bacterial Pathogenesis
Background:
- Outer membrane proteins (OMPs) are vital in eubacteria for functions including transport and host interactions.
- OMPs mediate pathogen attachment, cellular entry, and signaling cascade activation.
- Key structural features of OMPs include a β-barrel and signal peptide, with no transmembrane helix.
Purpose of the Study:
- To perform the first proteome-wide identification of OMPs in Mycobacterium avium subsp. paratuberculosis (MAP).
- To analyze the MAP proteome for proteins exhibiting OMP characteristics.
- To identify a core set of potential OMPs for further research.
Main Methods:
- Utilized a computational pipeline to screen MAP's amino acid sequences for OMP features.
- Analyzed secondary protein structures and calculated amphiphilic β-strand scores.
- Filtered identified proteins based on computed isoelectric points to pinpoint top OMP candidates.
Main Results:
- Analyzed 588 exported proteins from MAP.
- Predicted 264 proteins as inner membrane proteins.
- Identified 83 potential OMPs, with 57 designated as top candidates.
Conclusions:
- Successfully identified a core set of 57 OMPs in MAP.
- The identified OMPs are valuable for designing novel vaccines against MAP.
- Data provides a foundation for developing early serodiagnostic tools for MAP.
