1E0U

Structure R271L mutant of E. coli pyruvate kinase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

The Allosteric Regulation of Pyruvate Kinase.

Valentini, G.Chiarelli, L.Fortin, R.Speranza, M.L.Galizzi, A.Mattevi, A.

(2000) J Biol Chem 275: 18145

  • DOI: https://doi.org/10.1074/jbc.M001870200
  • Primary Citation of Related Structures:  
    1E0T, 1E0U

  • PubMed Abstract: 

    Pyruvate kinase (PK) is critical for the regulation of the glycolytic pathway. The regulatory properties of Escherichia coli were investigated by mutating six charged residues involved in interdomain salt bridges (Arg(271), Arg(292), Asp(297), and Lys(413)) and in the binding of the allosteric activator (Lys(382) and Arg(431)). Arg(271) and Lys(413) are located at the interface between A and C domains within one subunit. The R271L and K413Q mutant enzymes exhibit altered kinetic properties. In K413Q, there is partial enzyme activation, whereas R271L is characterized by a bias toward the T-state in the allosteric equilibrium. In the T-state, Arg(292) and Asp(297) form an intersubunit salt bridge. The mutants R292D and D297R are totally inactive. The crystal structure of R292D reveals that the mutant enzyme retains the T-state quaternary structure. However, the mutation induces a reorganization of the interface with the creation of a network of interactions similar to that observed in the crystal structures of R-state yeast and M1 PK proteins. Furthermore, in the R292D structure, two loops that are part of the active site are disordered. The K382Q and R431E mutations were designed to probe the binding site for fructose 1, 6-bisphosphate, the allosteric activator. R431E exhibits only slight changes in the regulatory properties. Conversely, K382Q displays a highly altered responsiveness to the activator, suggesting that Lys(382) is involved in both activator binding and allosteric transition mechanism. Taken together, these results support the notion that domain interfaces are critical for the allosteric transition. They couple changes in the tertiary and quaternary structures to alterations in the geometry of the fructose 1, 6-bisphosphate and substrate binding sites. These site-directed mutagenesis data are discussed in the light of the molecular basis for the hereditary nonspherocytic hemolytic anemia, which is caused by mutations in human erythrocyte PK gene.


  • Organizational Affiliation

    Department of Genetics & Microbiology, University of Pavia, via Abbiategrasso 207, 27100 Pavia, Italy. giovale@unipv.it


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Pyruvate kinase
A, B, C, D
470Escherichia coliMutation(s): 2 
Gene Names: pykFAC789_1c18560ACN002_1349EL75_1979EL79_2019EL80_2048HMPREF3040_05259
EC: 2.7.1.40
UniProt
Find proteins for P0AD61 (Escherichia coli (strain K12))
Explore P0AD61 
Go to UniProtKB:  P0AD61
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AD61
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.245 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.01α = 90
b = 129.59β = 90
c = 241.77γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
CCP4phasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-04-11
    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: 2019-09-25
    Changes: Advisory, Data collection, Database references, Other, Source and taxonomy, Structure summary
  • Version 1.4: 2023-12-06
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description