Mycobacteriophage cell binding proteins for the capture of mycobacteria

Area of Science:

• Microbiology and Virology
• Diagnostic Development

Background:

• Mycobacterium avium subsp. paratuberculosis (MAP) causes Johne's disease in cattle and is linked to Crohn's disease in humans.
• Mycobacterium smegmatis is a model organism that can cause opportunistic infections.
• Current diagnostics for MAP and M. smegmatis are lacking in speed, culture-independence, reliability, and cost-effectiveness.

Purpose of the Study:

• To investigate the potential of mycobacteriophage proteins as diagnostic tools for Mycobacterium infections.
• To assess the specificity and binding capabilities of phage proteins Gp6 and Gp10 for capturing MAP and M. smegmatis.

Main Methods:

• Utilized immobilized mycobacteriophage L5 minor tail protein Gp6 and lysin Gp10.
• Tested the binding of these proteins to Mycobacterium avium subsp. paratuberculosis and Mycobacterium smegmatis.
• Evaluated specificity against other bacteria like E. coli, Salmonella, Campylobacter, and Mycobacterium marinum.
• Employed electrospray ionization mass spectrometry to analyze Gp6 binding to mycobacterial surface glycan fragments.

Main Results:

• Immobilized Gp10 effectively captured both MAP and M. smegmatis.
• Gp6 demonstrated specificity for M. smegmatis capture.
• Neither Gp6 nor Gp10 captured non-mycobacterial species tested.
• Mass spectrometry provided insights into Gp6's interaction with mycobacterial glycans.

Conclusions:

• Mycobacteriophage proteins Gp6 and Gp10 show promise as a pathogen-capturing platform.
• These proteins could significantly enhance the effectiveness of existing diagnostic methods for Mycobacterium infections.
• Further research into Gp6's function and binding interactions is warranted.