Crystal Structure of Phosphopantothenoylcysteine Synthetase

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 

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This is version 1.4 of the entry. See complete history


Structure of human phosphopantothenoylcysteine synthetase at 2.3 A resolution.

Manoj, N.Strauss, E.Begley, T.P.Ealick, S.E.

(2003) Structure 11: 927-936

  • DOI: https://doi.org/10.1016/s0969-2126(03)00146-1
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of human phosphopantothenoylcysteine (PPC) synthetase was determined at 2.3 A resolution. PPC synthetase is a dimer with identical monomers. Some features of the monomer fold resemble a group of NAD-dependent enzymes, while other features resemble the ribokinase fold. The ATP, phosphopantothenate, and cysteine binding sites were deduced from modeling studies. Highly conserved ATP binding residues include Gly43, Ser61, Gly63, Gly66, Phe230, and Asn258. Highly conserved phosphopantothenate binding residues include Asn59, Ala179, Ala180, and Asp183 from one monomer and Arg55' from the adjacent monomer. The structure predicts a ping pong mechanism with initial formation of an acyladenylate intermediate, followed by release of pyrophosphate and attack by cysteine to form the final products PPC and AMP.

  • Organizational Affiliation

    Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Phosphopantothenoylcysteine synthetase
A, B
313Homo sapiensMutation(s): 0 
Gene Names: coaB
UniProt & NIH Common Fund Data Resources
Find proteins for Q9HAB8 (Homo sapiens)
Explore Q9HAB8 
Go to UniProtKB:  Q9HAB8
GTEx:  ENSG00000127125 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HAB8
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.229 
  • R-Value Observed: 0.229 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.16α = 90
b = 73.16β = 90
c = 281.83γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-09-02
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-04-03
    Changes: Refinement description