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Assembly of the covalent linkage between lipoic acid and its cognate enzymes

Academic Article
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Overview

authors

  • Zhao, X.
  • Miller, J. R.
  • Jiang, Y. F.
  • Marletta, Michael
  • Cronan, J. E.

publication date

  • December 2003

journal

  • Chemistry & Biology  Journal

abstract

  • Lipoic acid is synthesized from octanoic acid by insertion of sulfur atoms at carbons 6 and 8 and is covalently attached to a pyruvate dehydrogenase (PDH) subunit. We show that sulfur atoms can be inserted into octanoyl moieties attached to a PDH subunit or a derived domain. Escherichia coli lipB mutants grew well when supplemented with octanoate in place of lipoate. Octanoate growth required both lipoate protein ligase (LplA) and LipA, the sulfur insertion protein, suggesting that LplA attached octanoate to the dehydrogenase and LipA then converted the octanoate to lipoate. This pathway was tested by labeling a PDH domain with deuterated octanoate in an E. coli strain devoid of LipA activity. The labeled octanoyl domain was converted to lipoylated domain upon restoration of LipA. Moreover, octanoyl domain and octanoyl-PDH were substrates for sulfur insertion in vitro.

subject areas

  • Acyltransferases
  • Bacterial Proteins
  • Caprylates
  • Chromatography, High Pressure Liquid
  • Escherichia coli
  • Escherichia coli Proteins
  • Ligases
  • Lipoproteins
  • Mass Spectrometry
  • Membrane Proteins
  • Mutation
  • Protein Structure, Tertiary
  • Protein Subunits
  • Pyruvate Dehydrogenase (Lipoamide)
  • Sulfur
  • Thioctic Acid
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Identity

International Standard Serial Number (ISSN)

  • 1074-5521

Digital Object Identifier (DOI)

  • 10.1016/j.chembiol.2003.11.016

PubMed ID

  • 14700636
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Additional Document Info

start page

  • 1293

end page

  • 1302

volume

  • 10

issue

  • 12

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