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  • 1.
    Andersson, Charlotta S.
    et al.
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Lundgren, Camilla A. K.
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Magnúsdóttir, Auður
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Ge, Changrong
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Wieslander, Åke
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Martinez Molina, Daniel
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Högbom, Martin
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    The Mycobacterium tuberculosis Very-Long-Chain Fatty Acyl-CoA Synthetase: Structural Basis for Housing Lipid Substrates Longer than the Enzyme2012In: Structure, ISSN 0969-2126, E-ISSN 1878-4186, Vol. 20, no 6, p. 1062-1070Article in journal (Refereed)
    Abstract [en]

    The Mycobacterium tuberculosis acid-induced operon MymA encodes the fatty acyl-CoA synthetase FadD13 and is essential for virulence and intracellular growth of the pathogen. Fatty acyl-CoA synthetases activate lipids before entering into the metabolic pathways and are also involved in transmembrane lipid transport. Unlike soluble fatty acyl-CoA synthetases, but like the mammalian integral-membrane very-long-chain acyl-CoA synthetases, FadD13 accepts lipid substrates up to the maximum length tested (C-26). Here, we show that FadD13 is a peripheral membrane protein. The structure and mutational studies reveal an arginine- and aromatic-rich surface patch as the site for membrane interaction. The protein accommodates a hydrophobic tunnel that extends from the active site toward the positive patch and is sealed by an arginine-rich lid-loop at the protein surface. Based on this and previous data, we propose a structural basis for accommodation of lipid substrates longer than the enzyme and transmembrane lipid transport by vectorial CoA-esterification.

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