1W66

Structure of a lipoate-protein ligase b from Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.08 Å
  • R-Value Free: 0.146 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Mycobacterium Tuberculosis Lipb Enzyme Functions as a Cysteine/Lysine Dyad Acyltransferase.

Ma, Q.Zhao, X.Eddine, A.N.Geerlof, A.Li, X.Cronan, J.E.Kaufmann, S.H.Wilmanns, M.

(2006) Proc.Natl.Acad.Sci.USA 103: 8662

  • DOI: 10.1073/pnas.0510436103

  • PubMed Abstract: 
  • Lipoic acid is essential for the activation of a number of protein complexes involved in key metabolic processes. Growth of Mycobacterium tuberculosis relies on a pathway in which the lipoate attachment group is synthesized from an endogenously produ ...

    Lipoic acid is essential for the activation of a number of protein complexes involved in key metabolic processes. Growth of Mycobacterium tuberculosis relies on a pathway in which the lipoate attachment group is synthesized from an endogenously produced octanoic acid moiety. In patients with multiple-drug-resistant M. tuberculosis, expression of one gene from this pathway, lipB, encoding for octanoyl-[acyl carrier protein]-protein acyltransferase is considerably up-regulated, thus making it a potential target in the search for novel antiinfectives against tuberculosis. Here we present the crystal structure of the M. tuberculosis LipB protein at atomic resolution, showing an unexpected thioether-linked active-site complex with decanoic acid. We provide evidence that the transferase functions as a cysteine/lysine dyad acyltransferase, in which two invariant residues (Lys-142 and Cys-176) are likely to function as acid/base catalysts. Analysis by MS reveals that the LipB catalytic reaction proceeds by means of an internal thioesteracyl intermediate. Structural comparison of LipB with lipoate protein ligase A indicates that, despite conserved structural and sequence active-site features in the two enzymes, 4'-phosphopantetheine-bound octanoic acid recognition is a specific property of LipB.


    Organizational Affiliation

    EMBL-Hamburg Unit, European Molecular Biology Laboratory, Notkestrasse 85, 22603 Hamburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LIPOYLTRANSFERASE
A
232Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Mutation(s): 0 
Gene Names: lipB
EC: 2.3.1.181
Find proteins for P9WK83 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WK83
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DKA
Query on DKA

Download SDF File 
Download CCD File 
A
DECANOIC ACID
C10 H20 O2
GHVNFZFCNZKVNT-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.08 Å
  • R-Value Free: 0.146 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 48.918α = 90.00
b = 57.369β = 90.00
c = 73.804γ = 90.00
Software Package:
Software NamePurpose
SHELXDphasing
DENZOdata reduction
SADABSdata scaling
XPREPphasing
SHELXEphasing
SHELXL-97refinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2004-08-13 
  • Released Date: 2005-12-08 
  • Deposition Author(s): Ma, Q., Wilmanns, M.

Revision History 

  • Version 1.0: 2005-12-08
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-03-07
    Type: Source and taxonomy