Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.167 

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This is version 1.5 of the entry. See complete history


Complex landscape of protein structural dynamics unveiled by nanosecond Laue crystallography.

Bourgeois, D.Vallone, B.Schotte, F.Arcovito, A.Miele, A.E.Sciara, G.Wulff, M.Anfinrud, P.Brunori, M.

(2003) Proc Natl Acad Sci U S A 100: 8704-8709

  • DOI: https://doi.org/10.1073/pnas.1430900100
  • Primary Citation of Related Structures:  
    1MYZ, 1MZ0

  • PubMed Abstract: 

    Although conformational changes are essential for the function of proteins, little is known about their structural dynamics at atomic level resolution. Myoglobin (Mb) is the paradigm to investigate conformational dynamics because it is a simple globular heme protein displaying a photosensitivity of the iron-ligand bond. Upon laser photodissociation of carboxymyoglobin Mb a nonequilibrium population of protein structures is generated that relaxes over a broad time range extending from picoseconds to milliseconds. This process is associated with migration of the ligand to cavities in the matrix and with a reduction in the geminate rebinding rate by several orders of magnitude. Here we report nanosecond time-resolved Laue diffraction data to 1.55-A resolution on a Mb mutant, which depicts the sequence of structural events associated with this extended relaxation. Motions of the distal E-helix, including the mutated residue Gln-64(E7), and of the CD-turn are found to lag significantly (100-300 ns) behind local rearrangements around the heme such as heme tilting, iron motion out of the heme plane, and swinging of the mutated residue Tyr-29(B10), all of which occur promptly (< or =3 ns). Over the same delayed time range, CO is observed to migrate from a cavity distal to the heme known to bind xenon (called Xe4) to another such cavity proximal to the heme (Xe1). We propose that the extended relaxation of the globin moiety reflects reequilibration among conformational substates known to play an essential role in controlling protein function.

  • Organizational Affiliation

    Laboratoire de Cristallographie et de Cristallogénèse des Protéines, UMR 9015, Institut de Biologie Structurale/Commissariat à l'Energie Atomique/Université Joseph Fourier, and European Synchrotron Radiation Facility, Grenoble, France. bourgeoi@lccp.ibs.fr

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Myoglobin154Physeter catodonMutation(s): 4 
Find proteins for P02185 (Physeter macrocephalus)
Explore P02185 
Go to UniProtKB:  P02185
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02185
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.184 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.167 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.2α = 90
b = 91.2β = 90
c = 45.712γ = 120
Software Package:
Software NamePurpose
SPECdata collection
PROWdata reduction
SPECdata reduction
PROWdata scaling
CCP4data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-19
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Advisory
  • Version 1.4: 2021-10-27
    Changes: Advisory, Database references, Derived calculations
  • Version 1.5: 2024-02-14
    Changes: Data collection, Refinement description