'Known' TB gene reveals completed unexpected biological role under stress
The complete genome of the tuberculosis bacterium was sequenced and published in 1998. Since then, scientists have deciphered about two-thirds of TB's genes. Or have they?
In a surprising discovery, researchers have uncovered that a gene previously thought to have a specific role in the tuberculosis bacterium actually functions in a completely different manner under stress. Led by biochemist Luiz Pedro Carvalho of the Herbert Wertheim UF Scripps Institute for Biomedical Innovation and Technology, the team found that the gene, called rv2531c, encodes an enzyme that transforms the amino acid glutamate into GABA, an essential substance for bacterial metabolism, signaling, and defense.
This enzyme had been previously presumed to play a role in polyamine synthesis, a process crucial for protein building and various other functions. However, the new findings suggest that the enzyme's primary role is not in polyamine synthesis, leaving scientists with new questions about its true function. This unexpected behavior of the enzyme may have contributed to its previous obscurity in research, as scientists typically observe results within a minute under standard conditions.
The discovery could have significant implications for understanding antibiotic resistance in TB and developing new drugs, as well as exploring the roles of similar enzymes in other pathogenic organisms, such as the malaria parasite and leprosy-causing bacteria.
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