3NE3

Mycobacterium tuberculosis Acyl Carrier Protein Synthase Apo structure


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.248 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mycobacterium tuberculosis acyl carrier protein synthase adopts two different pH-dependent structural conformations.

Gokulan, K.Aggarwal, A.Shipman, L.Besra, G.S.Sacchettini, J.C.

(2011) Acta Crystallogr.,Sect.D 67: 657-669

  • DOI: 10.1107/S0907444911020221
  • Primary Citation of Related Structures:  3NE1, 3NE9, 3NFD

  • PubMed Abstract: 
  • The crystal structures of acyl carrier protein synthase (AcpS) from Mycobacterium tuberculosis (Mtb) and Corynebacterium ammoniagenes determined at pH 5.3 and pH 6.5, respectively, are reported. Comparison of the Mtb apo-AcpS structure with the recen ...

    The crystal structures of acyl carrier protein synthase (AcpS) from Mycobacterium tuberculosis (Mtb) and Corynebacterium ammoniagenes determined at pH 5.3 and pH 6.5, respectively, are reported. Comparison of the Mtb apo-AcpS structure with the recently reported structure of the Mtb AcpS-ADP complex revealed that AcpS adopts two different conformations: the orthorhombic and trigonal space-group structures show structural differences in the α2 helix and in the conformation of the α3-α4 connecting loop, which is in a closed conformation. The apo-AcpS structure shows electron density for the entire model and was obtained at lower pH values (4.4-6.0). In contrast, at a higher pH value (6.5) AcpS undergoes significant conformational changes, resulting in disordered regions that show no electron density in the AcpS model. The solved structures also reveal that C. ammoniagenes AcpS undergoes structural rearrangement in two regions, similar to the recently reported Mtb AcpS-ADP complex structure. In vitro reconstitution experiments show that AcpS has a higher post-translational modification activity between pH 4.4 and 6.0 than at pH values above 6.5, where the activity drops owing to the change in conformation. The results show that apo-AcpS and AcpS-ADP adopt different conformations depending upon the pH conditions of the crystallization solution.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-3474, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Holo-[acyl-carrier-protein] synthase
B
130Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Gene Names: acpS
EC: 2.7.8.7
Find proteins for P9WQD3 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WQD3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.248 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 67.933α = 90.00
b = 67.933β = 90.00
c = 83.982γ = 120.00
Software Package:
Software NamePurpose
CNSphasing
ADSCdata collection
CNSrefinement
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-07-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-07-25
    Type: Database references, Structure summary