Laue Structure of L29W MbCO

Experimental Data Snapshot

  • Resolution: 1.68 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 

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This is version 1.2 of the entry. See complete history


Ligand Migration Pathway and Protein Dynamics in Myoglobin: A Time-Resolved Crystallographic Study on L29W Mbco.

Schmidt, M.Nienhaus, K.Pahl, R.Krasselt, A.Anderson, S.Parak, F.Nienhaus, G.U.Srajer, V.

(2005) Proc Natl Acad Sci U S A 102: 11704

  • DOI: https://doi.org/10.1073/pnas.0504932102
  • Primary Citation of Related Structures:  
    2BW9, 2BWH

  • PubMed Abstract: 

    By using time-resolved x-ray crystallography at room temperature, structural relaxations and ligand migration were examined in myoglobin (Mb) mutant L29W from nanoseconds to seconds after photodissociation of carbon monoxide (CO) from the heme iron by nanosecond laser pulses. The data were analyzed in terms of transient kinetics by fitting trial functions to integrated difference electron density values obtained from select structural moieties, thus allowing a quantitative description of the processes involved. The observed relaxations are linked to other investigations on protein dynamics. At the earliest times, the heme has already completely relaxed into its domed deoxy structure, and there is no photo-dissociated CO visible at the primary docking site. Initial relaxations of larger globin moieties are completed within several hundred nanoseconds. They influence the concomitant migration of photo-dissociated CO to the Xe1 site, where it appears at approximately 300 ns and leaves again at approximately 1.5 ms. The extremely long residence time in Xe1 as compared with wild-type MbCO implies that, in the latter protein, the CO exits the protein from Xe1 predominantly via the distal pocket. A well-defined deligated state is populated between approximately 2 micros and approximately 1 ms; its structure is very similar to the equilibrium deoxy structure. Between 1.5 and 20 ms, no CO is visible in the protein interior; it is either distributed among many sites within the protein or has escaped to the solvent. Finally, recombination at the heme iron occurs after >20 ms.

  • Organizational Affiliation

    Physikdepartment E17, Technische Universität München, James Franck Strasse, 85747 Garching, Germany. marius.schmidt@ph.tum.de

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
MYOGLOBINA [auth M]153Physeter catodonMutation(s): 1 
Gene Names: MB
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
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HEM

Download Ideal Coordinates CCD File 
C34 H32 Fe N4 O4
Query on CMO

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 1.68 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.216 
  • Space Group: P 6
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.87α = 90
b = 91.87β = 90
c = 46.04γ = 120
Software Package:
Software NamePurpose
Precognitiondata reduction
Epinormdata reduction
LaueViewdata reduction
Precognitiondata scaling
Epinormdata scaling
LaueViewdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-07-13
    Type: Initial release
  • Version 1.1: 2019-05-22
    Changes: Data collection, Refinement description
  • Version 1.2: 2019-11-27
    Changes: Advisory, Derived calculations, Refinement description