Abstract
In Mycobacterium tuberculosis, acyl carrier protein (AcpM)-mediated fatty acid synthase type II is integral for the synthesis of mycolic acids. AcpM, designated as an atypical ACP, comprises of a putative 33 amino acid long C-terminal extension which is distinctive in nature. Here, we aimed at devising an 'easy-to-go' method for the generation of crypto-AcpM loaded with a solvatochromic probe 7-Nitrobenz-2-oxa-1,3-diazol-4-yl, which is linked to the 4'-phosphopantetheine (Ppant) prosthetic group of AcpM. The crypto-AcpM, coupled with fluorescence spectroscopy and molecular dynamics simulation studies, was employed to explore the elusive dynamics of Ppant arm in AcpM. This investigation establishes the role of the flexible C-terminal extension of AcpM in regulating the prosthetic group sequestration ability by modulating the 'Asp-Ser-Leu' motif.
Keywords:
Mycobacterium tuberculosis; acyl carrier protein; coenzyme A; fatty acid synthase; fluorescence spectroscopy; molecular dynamics.
© 2019 Federation of European Biochemical Societies.
Publication types
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Letter
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Motifs
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Azoles / chemistry
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Bacterial Proteins / chemistry*
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Bacterial Proteins / genetics
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Bacterial Proteins / metabolism
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Binding Sites
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Carrier Proteins / chemistry*
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Carrier Proteins / genetics
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Carrier Proteins / metabolism
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Cloning, Molecular
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Coenzyme A / chemistry*
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Coenzyme A / metabolism
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Escherichia coli / genetics
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Escherichia coli / metabolism
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Fluorescent Dyes / chemistry
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Gene Expression
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Genetic Vectors / chemistry
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Genetic Vectors / metabolism
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Molecular Docking Simulation
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Molecular Dynamics Simulation
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Mycobacterium tuberculosis / chemistry*
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Mycobacterium tuberculosis / genetics
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Mycobacterium tuberculosis / metabolism
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Mycolic Acids / metabolism
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Nitrobenzenes / chemistry
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Pantetheine / analogs & derivatives*
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Pantetheine / chemistry
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Pantetheine / metabolism
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Protein Binding
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Protein Conformation, alpha-Helical
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Protein Interaction Domains and Motifs
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Recombinant Proteins / chemistry
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Recombinant Proteins / genetics
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Recombinant Proteins / metabolism
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Sequence Alignment
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Sequence Homology, Amino Acid
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Substrate Specificity
Substances
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7-nitrobenz-2-oxa-1,3-diazol-4-yl
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AcpM protein, Mycobacterium tuberculosis
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Azoles
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Bacterial Proteins
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Carrier Proteins
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Fluorescent Dyes
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Mycolic Acids
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Nitrobenzenes
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Recombinant Proteins
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Pantetheine
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4'-phosphopantetheine
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Coenzyme A