Abstract
The mycobacterial FASII multi-enzyme complex has been identified to be a target of Ser/Thr protein kinases (STPKs) of Mycobacterium tuberculosis (MTB), with substrates, including the malonyl-CoA:ACP transacylase (FabD) and the β-ketoacyl-ACP synthases KasA and KasB. These proteins are phosphorylated by various kinases in vitro. The present study links the correlation of FASII pathway with serine threonine protein kinase of MTB. In the preliminary finding, we have shown that mycobacterial protein Rv3080c (PknK) phosphorylates FabD and the knockdown of PknK protein in mycobacteria down regulates FabD expression. This event leads to the differential inhibition of mycobacteria in the presence of isoniazid (INH), as the inhibition of growth of mycobacteria in the presence of INH is enhanced in PknK deficient mycobacteria.
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