5BP1

Condensing di-domain (KS-AT) of a mycocerosic acid synthase-like (MAS-like) PKS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.203 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Mycocerosic acid synthase exemplifies the architecture of reducing polyketide synthases.

Herbst, D.A.Jakob, R.P.Zahringer, F.Maier, T.

(2016) Nature 531: 533-537

  • DOI: 10.1038/nature16993
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Polyketide synthases (PKSs) are biosynthetic factories that produce natural products with important biological and pharmacological activities. Their exceptional product diversity is encoded in a modular architecture. Modular PKSs (modPKSs) catalyse r ...

    Polyketide synthases (PKSs) are biosynthetic factories that produce natural products with important biological and pharmacological activities. Their exceptional product diversity is encoded in a modular architecture. Modular PKSs (modPKSs) catalyse reactions colinear to the order of modules in an assembly line, whereas iterative PKSs (iPKSs) use a single module iteratively as exemplified by fungal iPKSs (fiPKSs). However, in some cases non-colinear iterative action is also observed for modPKSs modules and is controlled by the assembly line environment. PKSs feature a structural and functional separation into a condensing and a modifying region as observed for fatty acid synthases. Despite the outstanding relevance of PKSs, the detailed organization of PKSs with complete fully reducing modifying regions remains elusive. Here we report a hybrid crystal structure of Mycobacterium smegmatis mycocerosic acid synthase based on structures of its condensing and modifying regions. Mycocerosic acid synthase is a fully reducing iPKS, closely related to modPKSs, and the prototype of mycobacterial mycocerosic acid synthase-like PKSs. It is involved in the biosynthesis of C20-C28 branched-chain fatty acids, which are important virulence factors of mycobacteria. Our structural data reveal a dimeric linker-based organization of the modifying region and visualize dynamics and conformational coupling in PKSs. On the basis of comparative small-angle X-ray scattering, the observed modifying region architecture may be common also in modPKSs. The linker-based organization provides a rationale for the characteristic variability of PKS modules as a main contributor to product diversity. The comprehensive architectural model enables functional dissection and re-engineering of PKSs.


    Organizational Affiliation

    Department Biozentrum, University of Basel, Klingelbergstrasse 50/70, 4056 Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mycocerosic acid synthase
A
893Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155)Mutation(s): 0 
Gene Names: pks5
EC: 2.3.1.-
Find proteins for A0R1E8 (Mycobacterium smegmatis (strain ATCC 700084 / mc(2)155))
Go to UniProtKB:  A0R1E8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.203 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.205 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 77.530α = 90.00
b = 77.530β = 90.00
c = 371.220γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland125357
Swiss National Science FoundationSwitzerland138262
Swiss National Science FoundationSwitzerland159696
Swiss National Science FoundationSwitzerland145023

Revision History 

  • Version 1.0: 2016-03-09
    Type: Initial release
  • Version 1.1: 2016-03-30
    Type: Database references
  • Version 1.2: 2016-04-06
    Type: Database references
  • Version 1.3: 2016-12-28
    Type: Structure summary
  • Version 1.4: 2017-09-06
    Type: Author supporting evidence