3V7I

Germicidin synthase (Gcs) from Streptomyces coelicolor, a type III polyketide synthase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Biochemical and Structural Characterization of Germicidin Synthase: Analysis of a Type III Polyketide Synthase That Employs Acyl-ACP as a Starter Unit Donor.

Chemler, J.A.Buchholz, T.J.Geders, T.W.Akey, D.L.Rath, C.M.Chlipala, G.E.Smith, J.L.Sherman, D.H.

(2012) J.Am.Chem.Soc. 134: 7359-7366

  • DOI: 10.1021/ja2112228

  • PubMed Abstract: 
  • Germicidin synthase (Gcs) from Streptomyces coelicolor is a type III polyketide synthase (PKS) with broad substrate flexibility for acyl groups linked through a thioester bond to either coenzyme A (CoA) or acyl carrier protein (ACP). Germicidin synth ...

    Germicidin synthase (Gcs) from Streptomyces coelicolor is a type III polyketide synthase (PKS) with broad substrate flexibility for acyl groups linked through a thioester bond to either coenzyme A (CoA) or acyl carrier protein (ACP). Germicidin synthesis was reconstituted in vitro by coupling Gcs with fatty acid biosynthesis. Since Gcs has broad substrate flexibility, we directly compared the kinetic properties of Gcs with both acyl-ACP and acyl-CoA. The catalytic efficiency of Gcs for acyl-ACP was 10-fold higher than for acyl-CoA, suggesting a strong preference toward carrier protein starter unit transfer. The 2.9 Å germicidin synthase crystal structure revealed canonical type III PKS architecture along with an unusual helical bundle of unknown function that appears to extend the dimerization interface. A pair of arginine residues adjacent to the active site affect catalytic activity but not ACP binding. This investigation provides new and surprising information about the interactions between type III PKSs and ACPs that will facilitate the construction of engineered systems for production of novel polyketides.


    Organizational Affiliation

    Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative polyketide synthase
A
413Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145)Mutation(s): 0 
Find proteins for Q9K464 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Go to UniProtKB:  Q9K464
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.229 
  • Space Group: P 41 3 2
Unit Cell:
Length (Å)Angle (°)
a = 182.703α = 90.00
b = 182.703β = 90.00
c = 182.703γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling
BALBESphasing
HKL-2000data scaling
DENZOdata reduction
PDB_EXTRACTdata extraction
HKL-2000data collection
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-04-18
    Type: Initial release
  • Version 1.1: 2012-06-20
    Type: Database references
  • Version 1.2: 2017-11-08
    Type: Refinement description