Crystal structure of the tyrosine-regulated 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase from Saccharomyces cerevisiae complexed with phosphoenolpyruvate

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

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Evolution of Feedback-Inhibited Beta /Alpha Barrel Isoenzymes by Gene Duplication and a Single Mutation

Hartmann, M.Schneider, T.R.Pfeil, A.Heinrich, G.Lipscomb, W.Braus, G.H.

(2003) Proc Natl Acad Sci U S A 100: 862

  • DOI: https://doi.org/10.1073/pnas.0337566100
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The betaalpha barrel is the common protein fold of numerous enzymes and was proposed recently to be the result of gene duplication and fusion of an ancient half-barrel. The initial enzyme of shikimate biosynthesis possesses the additional feature of feedback regulation. The crystal structure and kinetic studies on chimera and mutant proteins of yeast 3-deoxy-d-arabino-heptulosonate-7-phosphate (DAHP) synthase from Saccharomyces cerevisiae inhibited by phenylalanine (Aro3p) and DAHP synthase S. cerevisiae inhibited by tyrosine (Aro4p) give insight into important regions for regulation in the enzyme: The loop, which is connecting the two half-barrels, and structural elements added to the barrel are prerequisites for regulation and form a cavity on the N-terminal side of the betaalpha barrel. In the cavity of Aro4p at position 226 is a glycine residue, which is highly conserved in all other tyrosine-regulated DAHP synthases as well. Sequence alignments with phenylalanine-regulated DAHP synthases including Aro3p show a highly conserved serine residue at this position. An exchange of glycine to serine and vice versa leads to a complete change in the regulation pattern. Therefore the evolution of these differently feedback-inhibited isoenzymes required gene duplication and a single mutation within the internal extra element. Numerous additional amino acid substitutions present in the contemporary isoenzymes are irrelevant for regulation and occurred independently.

  • Organizational Affiliation

    Institut für Mikrobiologie and Genetik and Abteilung für Strukturchemie, Georg August Universität, D-37077 Göttingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H
370Saccharomyces cerevisiaeMutation(s): 0 
EC: (PDB Primary Data), (UniProt)
Find proteins for P32449 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32449 
Go to UniProtKB:  P32449
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP32449
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82α = 65.6
b = 93.8β = 85.6
c = 104.5γ = 75.4
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-01-14
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Data collection