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• W2100028839 startingPage "e2320" @default.
• W2100028839 abstract "Background Fatty acids are indispensable constituents of mycolic acids that impart toughness & permeability barrier to the cell envelope of M. tuberculosis. Biotin is an essential co-factor for acetyl-CoA carboxylase (ACC) the enzyme involved in the synthesis of malonyl-CoA, a committed precursor, needed for fatty acid synthesis. Biotin carboxyl carrier protein (BCCP) provides the co-factor for catalytic activity of ACC. Methodology/Principal Findings BPL/BirA (Biotin Protein Ligase), and its substrate, biotin carboxyl carrier protein (BCCP) of Mycobacterium tuberculosis (Mt) were cloned and expressed in E. coli BL21. In contrast to EcBirA and PhBPL, the ∼29.5 kDa MtBPL exists as a monomer in native, biotin and bio-5′AMP liganded forms. This was confirmed by molecular weight profiling by gel filtration on Superdex S-200 and Dynamic Light Scattering (DLS). Computational docking of biotin and bio-5′AMP to MtBPL show that adenylation alters the contact residues for biotin. MtBPL forms 11 H-bonds with biotin, relative to 35 with bio-5′AMP. Docking simulations also suggest that bio-5′AMP hydrogen bonds to the conserved ‘GRGRRG’ sequence but not biotin. The enzyme catalyzed transfer of biotin to BCCP was confirmed by incorporation of radioactive biotin and by Avidin blot. The Km for BCCP was ∼5.2 µM and ∼420 nM for biotin. MtBPL has low affinity (Kb = 1.06×10−6 M) for biotin relative to EcBirA but their Km are almost comparable suggesting that while the major function of MtBPL is biotinylation of BCCP, tight binding of biotin/bio-5′AMP by EcBirA is channeled for its repressor activity. Conclusions/Significance These studies thus open up avenues for understanding the unique features of MtBPL and the role it plays in biotin utilization in M. tuberculosis." @default.
• W2100028839 created "2016-06-24" @default.
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• W2100028839 date "2008-05-28" @default.
• W2100028839 modified "2023-09-26" @default.
• W2100028839 title "Ligand Specificity of Group I Biotin Protein Ligase of Mycobacterium tuberculosis" @default.
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• W2100028839 doi "https://doi.org/10.1371/journal.pone.0002320" @default.
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