1TED

Crystal structure of a type III polyketide synthase PKS18 from Mycobacterium tuberculosis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A novel tunnel in mycobacterial type III polyketide synthase reveals the structural basis for generating diverse metabolites

Sankaranarayanan, R.Saxena, P.Marathe, U.B.Gokhale, R.S.Shanmugam, V.M.Rukmini, R.

(2004) Nat.Struct.Mol.Biol. 11: 894-900

  • DOI: 10.1038/nsmb809
  • Primary Citation of Related Structures:  1TEE

  • PubMed Abstract: 
  • The superfamily of plant and bacterial type III polyketide synthases (PKSs) produces diverse metabolites with distinct biological functions. PKS18, a type III PKS from Mycobacterium tuberculosis, displays an unusual broad specificity for aliphatic lo ...

    The superfamily of plant and bacterial type III polyketide synthases (PKSs) produces diverse metabolites with distinct biological functions. PKS18, a type III PKS from Mycobacterium tuberculosis, displays an unusual broad specificity for aliphatic long-chain acyl-coenzyme A (acyl-CoA) starter units (C(6)-C(20)) to produce tri- and tetraketide pyrones. The crystal structure of PKS18 reveals a 20 A substrate binding tunnel, hitherto unidentified in this superfamily of enzymes. This remarkable tunnel extends from the active site to the surface of the protein and is primarily generated by subtle changes of backbone dihedral angles in the core of the protein. Mutagenic studies combined with structure determination provide molecular insights into the structural elements that contribute to the chain length specificity of the enzyme. This first bacterial type III PKS structure underlines a fascinating example of the way in which subtle changes in protein architecture can generate metabolite diversity in nature.


    Related Citations: 
    • Crystallization and preliminary X-ray crystallographic investigations of an unusual type III polyketide synthase PKS18 from Mycobacterium tuberculosis
      Rukmini, R.,Shanmugam, V.M.,Saxena, P.,Gokhale, R.S.,Sankaranarayanan, R.
      (2004) Acta Crystallogr.,Sect.D 60: 749


    Organizational Affiliation

    Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India. sankar@ccmb.res.in




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
pks18
A, B, C, D
393Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Gene Names: pks18
EC: 2.3.1.-
Find proteins for P9WPF1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  P9WPF1
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MYR
Query on MYR

Download SDF File 
Download CCD File 
A, B, C, D
MYRISTIC ACID
C14 H28 O2
TUNFSRHWOTWDNC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.205 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 59.914α = 108.23
b = 80.654β = 92.97
c = 99.612γ = 103.69
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
CCP4phasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-03
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance