Crystal Structure of Bovine Lipoyltransferase in Complex with Lipoyl-AMP

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 

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Crystal structure of bovine Lipoyltransferase in complex with lipoyl-AMP

Fujiwara, K.Hosaka, H.Matsuda, M.Okamura-Ikeda, K.Motokawa, Y.Suzuki, M.Nakagawa, A.Taniguchi, H.

(2007) J Mol Biol 371: 222-234

  • DOI: https://doi.org/10.1016/j.jmb.2007.05.059
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Lipoic acid is an essential cofactor of the alpha-ketoacid dehydrogenase complexes and the glycine cleavage system. It is covalently attached to a specific lysine residue of the subunit of the complexes. The bovine lipoyltransferase (bLT) catalyzes the lipoic acid attachment reaction using lipoyl-AMP as a substrate, forming a lipoylated protein and AMP. To gain insights into the reaction mechanism at the atomic level, we have determined the crystal structure of bLT at 2.10 A resolution. Unexpectedly, the purified recombinant bLT contains endogenous lipoyl-AMP. The structure of bLT consists of N-terminal and C-terminal domains, and lipoyl-AMP is bound to the active site in the N-terminal domain, adopting a U-shaped conformation. The lipoyl moiety is buried in the hydrophobic pocket, forming van der Waals interactions, and the AMP moiety forms numerous hydrogen bonds with bLT in another tunnel-like cavity. These interactions work together to expose the C10 atom of lipoyl-AMP to the surface of the bLT molecule. The carbonyl oxygen atom of lipoyl-AMP interacts with the invariant Lys135. The interaction might stimulate the positive charge of the C10 atom of lipoyl-AMP, and consequently facilitate the nucleophilic attack by the lysine residue of the lipoate-acceptor protein, accompanying the bond cleavage between the carbonyl group and the phosphate group. We discuss the structural differences between bLT and the lipoate-protein ligase A from Escherichia coli and Thermoplasma acidophilum. We further demonstrate that bLT in mitochondria also contains endogenous lipoylmononucleotide, being ready for the lipoylation of apoproteins.

  • Organizational Affiliation

    Institute for Enzyme Research, the University of Tokushima, Tokushima 770-8503, Japan. fujiwara@ier.tokushima-u.ac.jp

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lipoyltransferase 1347Bos taurusMutation(s): 0 
Gene Names: LIPT1
EC: 6 (PDB Primary Data), 2.3.1 (UniProt)
Find proteins for O46419 (Bos taurus)
Explore O46419 
Go to UniProtKB:  O46419
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO46419
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.219 
  • R-Value Observed: 0.221 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.439α = 90
b = 81.439β = 90
c = 120.532γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-09-04
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance