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Are all VapC toxins of Mycobacterium tuberculosis endowed with enigmatic RNase activity?
Mycobacterium tuberculosis ( M. tb ) employs an extensive network of more than 90 toxin-antitoxin systems, and among them, VapC toxins are the most abundant. While most VapCs function as classical RNases with toxic effects, a significant number of them do not exhibit toxicity. However, these non-toxic VapCs may retain specific RNA binding abilities as seen in case of VapC16, leading to ribosome stalling at specific codons and reprofiling M. tb 's proteome to aid in the bacterium's survival under different stressful conditions within the host. Here, we challenge the conventional classification of all VapC toxins as RNases and highlight the complexity of M. tb 's strategies for survival and adaptation during infection.
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