Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 

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This is version 1.3 of the entry. See complete history


Adenylate kinase motions during catalysis: an energetic counterweight balancing substrate binding.

Muller, C.W.Schlauderer, G.J.Reinstein, J.Schulz, G.E.

(1996) Structure 4: 147-156

  • DOI: https://doi.org/10.1016/s0969-2126(96)00018-4
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Adenylate kinases undergo large conformational changes during their catalytic cycle. Because these changes have been studied by comparison of structures from different species, which share approximately one-third of their residues, only rough descriptions have been possible to date. We have solved the structure of unligated adenylate kinase from Escherichia coli at 2.2 degree resolution and compared it with the high-resolution structure of the same enzyme ligated with an inhibitor mimicking both substrates, ATP and AMP. This comparison shows that, upon substrate binding, the enzyme increases its chain mobility in a region remote from the active center. As this region 'solidifies' again on substrate release, we propose that it serves as a 'counterweight' balancing the substrate binding energy. The comparison of two very different conformations of the same polypeptide chain revealed kinematic details of the catalytic cycle. Moreover, it indicated that there exists an energetic counterweight compensating the substrate binding energy required for specificity. This counterweight prevents the enzyme from dropping into a rate-reducing energy well along the reaction coordinate.

  • Organizational Affiliation

    Institut für Organische Chemie und Biochemie, 79104-Freiburg im Breisgau, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
214Escherichia coliMutation(s): 0 
Find proteins for P69441 (Escherichia coli (strain K12))
Explore P69441 
Go to UniProtKB:  P69441
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69441
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.8α = 67.7
b = 54.5β = 77.9
c = 71.3γ = 88.4
Software Package:
Software NamePurpose
X-PLORmodel building
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-06-10
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-28
    Changes: Data collection, Database references, Other