Strategy for the Enrichment of Protein Biomarkers from Diverse Bacterial Select Agents

Author(s): Sasikumar Sabna, Dev Vrat Kamboj, Ravi Bhushan Kumar, Prabhakar Babele, Sakshi Rajoria, Mahendra Kumar Gupta, Syed Imteyaz Alam*

Journal Name: Protein & Peptide Letters

Volume 28 , Issue 9 , 2021

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Graphical Abstract:


Background: Some pathogenic bacteria can be potentially used for nefarious applications in the event of bioterrorism or biowarfare. Accurate identification of biological agent from clinical and diverse environmental matrices is of paramount importance for implementation of medical countermeasures and biothreat mitigation.

Objective: A novel methodology is reported here for the development of a novel enrichment strategy for the generally conserved abundant bacterial proteins for an accurate downstream species identification using tandem MS analysis in biothreat scenario.

Methods: Conserved regions in the common bacterial protein markers were analyzed using bioinformatic tools and stitched for a possible generic immuno-capture for an intended downstream MS/MS analysis. Phylogenetic analysis of selected proteins was carried out and synthetic constructs were generated for the expression of conserved stitched regions of 60 kDa chaperonin GroEL. Hyper-immune serum was raised against recombinant synthetic GroEL protein.

Results: The conserved regions of common bacterial proteins were stitched for a possible generic immuno-capture and subsequent specific identification by tandem MS using variable regions of the molecule. Phylogenetic analysis of selected proteins was carried out and synthetic constructs were generated for the expression of conserved stitched regions of GroEL. In a proof-of-concept study, hyper-immune serum raised against recombinant synthetic GroEL protein exhibited reactivity with ~60 KDa proteins from the cell lysates of three bacterial species tested.

Conclusion: The envisaged methodology can lead to the development of a novel enrichment strategy for the abundant bacterial proteins from complex environmental matrices for the downstream species identification with increased sensitivity and substantially reduce the time-to-result.

Keywords: Protein enrichment, biothreat agent, mass spectrometry, GroEL, sample preparation, Hyper-immune serum.

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Article Details

Year: 2021
Published on: 05 April, 2021
Page: [1071 - 1082]
Pages: 12
DOI: 10.2174/0929866528666210405160131
Price: $65

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