Crystal structure of PigG

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 

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Crystal structure of MBP-PigG fusion protein and the essential function of PigG in the prodigiosin biosynthetic pathway in Serratia marcescens FS14.

Zhang, F.Wei, Q.Tong, H.Xu, D.Wang, W.Ran, T.

(2017) Int J Biol Macromol 99: 394-400

  • DOI: https://doi.org/10.1016/j.ijbiomac.2017.02.088
  • Primary Citation of Related Structures:  
    5GXT, 5GXV

  • PubMed Abstract: 

    Prodigiosin, a tripyrrole red pigment is synthesized by Serratia and some other microbes through a bifurcated biosynthesis pathway; MBC (4-methoxy-2,2'-bipyrrole-5-carbaldehyde) and MAP (2-methyl-3-n-amyl-pyrrole) are synthesized separately and then condensed by PigC to form prodigiosin. PigI, PigG and PigA have been shown to be involved in the first steps of MBC biosynthesis (proline incorporation). The crystal structure of PigG was resolved to elucidate its function and mechanism. PigG, an acyl carrier protein (ACP), features the ACP architecture:, a helical bundle fold containing three major helices and a minor distorted helix together with a conserved "S" motif. An in-frame deletion mutation of the pigG gene abolished the synthesis of prodigiosin in Serratia marcescens FS14. The production of prodigiosin was fully restored by complementation of intact pigG; however the S36A mutant was not able to restore function in the in-frame deletion pigG mutant, indicating that PigG and the conserved serine residue (S36) of PigG are essential for the synthesis of prodigiosin.

  • Organizational Affiliation

    Key Laboratory of Microbiological Engineering of Agricultural Environment, Ministry of Agriculture, Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Nanjing, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Maltose-binding periplasmic protein,PigG468Escherichia coli K-12Serratia sp. FS14
This entity is chimeric
Mutation(s): 0 
Gene Names: malEb4034JW3994
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Explore P0AEX9 
Go to UniProtKB:  P0AEX9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AEX9
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MG

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.233 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.7α = 90
b = 60β = 99.3
c = 81.4γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31400055
National Natural Science Foundation of ChinaChina31170686
National Natural Science Foundation of ChinaChina31100028
the Natural Science Foundation of Jiangsu ProvinceChinaBK20140690

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-19
    Type: Initial release
  • Version 1.1: 2017-10-18
    Changes: Author supporting evidence
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references