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The M. tuberculosis antigen 85 complex and mycolyltransferase activity.
L Kremer1, W N Maughan, R A Wilson
1Department of Microbiology & Immunology, University of Newcastle upon Tyne, UK.
Letters in Applied Microbiology
|April 10, 2002
Summary
Mycobacterium tuberculosis antigen 85 complex (Ag85) proteins FbpA, FbpB, and FbpC2 have mycolyltransferase activity. FbpC1, a related protein, was investigated and found to lack this activity, suggesting its function remains unknown.
Area of Science:
- Microbiology
- Biochemistry
- Tuberculosis research
Background:
- The antigen 85 complex (Ag85) in Mycobacterium tuberculosis includes FbpA, FbpB, and FbpC2, crucial for pathogenesis and mycolyltransferase activity.
- A newly identified protein, FbpC1, shares similarity with the Ag85 complex.
Purpose of the Study:
- To investigate whether FbpC1 possesses mycolyltransferase activity, a hallmark of the Ag85 complex.
- To determine the specific proteins within the Ag85 complex responsible for mycolyltransferase activity.
Main Methods:
- Heterologous expression of FbpA, FbpC1, and FbpC2 in Escherichia coli.
- Purification of recombinant proteins under non-denaturing conditions.
- In vitro mycolyltransferase assay to assess enzyme activity.
Main Results:
- Recombinant FbpC1 did not exhibit in vitro mycolyltransferase activity.
- FbpC1 was not recognized by monoclonal antibodies specific to the native Ag85 complex.
- FbpA and FbpC2 demonstrated mycolyltransferase activity, consistent with known functions.
Conclusions:
- Mycolyltransferase activity is confined to FbpA, FbpB, and FbpC2 within the Ag85 family.
- The specific biological role of FbpC1 in Mycobacterium tuberculosis requires further investigation.