Crystal structure of photolysed carbonmonoxy-myoglobin.Schlichting, I., Berendzen, J., Phillips Jr., G.N., Sweet, R.M.
(1994) Nature 371: 808-812
- PubMed: 7935843
- DOI: 10.1038/371808a07969399
- Also Cited By: 1DXD, 1DXC, 1DWT, 1DWS, 1DWR
- PubMed Abstract:
- Crystal Structure of Myoglobin from a Synthetic Gene
Phillips Jr., G.N.,Arduini, R.M.,Springer, B.A.,Sligar, S.G.
(1990) Proteins 7: 358
- High-Level Expression of Sperm Whale Myoglobin in Escherichia Coli
Springer, B.A.,Sligar, S.G.
(1987) Proc.Natl.Acad.Sci.USA 84: 8961
Myoglobin is a globular haem protein that reversibly binds ligands such as O2 and CO. Single photons of visible light can break the covalent bond between CO and the haem iron in carbon-monoxy-myoglobin (MbCO) and thus form an unstable intermediate, M ...
Myoglobin is a globular haem protein that reversibly binds ligands such as O2 and CO. Single photons of visible light can break the covalent bond between CO and the haem iron in carbon-monoxy-myoglobin (MbCO) and thus form an unstable intermediate, Mb*CO, with the CO inside the protein. The ensuing rebinding process has been extensively studied as a model for the interplay of dynamics, structure and function in protein reactions. We have used X-ray crystallography at liquid-helium temperatures to determine the structure of Mb*CO to a resolution of 1.5 A. The photodissociated CO lies on top of the haem pyrrole ring C. Comparison with the CO-bound and unligated myoglobin structures reveals that on photodissociation of the CO, the haem 'domes', the iron moves partially out of the haem plane, the iron-proximal histidine bonds is compressed, the F helix is strained and the distal histidine swings towards the outside of the ligand-binding pocket.
Department of Biophysics, Max Planck Institute for Medical Research, Heidelberg, Germany.