2BWH

Laue Structure of a Short Lived State of L29W Myoglobin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

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.USA 102: 11704

  • DOI: 10.1073/pnas.0504932102
  • Primary Citation of Related Structures:  2BW9

  • 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 b ...

    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 Universit√§t M√ľnchen, James Franck Strasse, 85747 Garching, Germany. marius.schmidt@ph.tum.de




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MYOGLOBIN
A
153Physeter catodonGene Names: MB
Find proteins for P02185 (Physeter catodon)
Go to Gene View: MB
Go to UniProtKB:  P02185
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download SDF File 
Download CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CMO
Query on CMO

Download SDF File 
Download CCD File 
A
CARBON MONOXIDE
C O
UGFAIRIUMAVXCW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.230 
  • Space Group: P 6
Unit Cell:
Length (Å)Angle (°)
a = 91.870α = 90.00
b = 91.870β = 90.00
c = 46.040γ = 120.00
Software Package:
Software NamePurpose
Precognitiondata reduction
LAUEVIEWdata scaling
LAUEVIEWdata reduction
CNSrefinement
Epinormdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-07-28
    Type: Initial release