Primary Citation of Related Structures: 1DWR, 1DWS, 1DWT
PubMed Abstract:
Small molecules such as NO, O2, CO or H2 are important biological ligands that bind to metalloproteins to function crucially in processes such as signal transduction, respiration and catalysis. A key issue for understanding the regulation of reaction mechanisms in these systems is whether ligands gain access to the binding sites through specific channels and docking sites, or by random diffusion through the protein matrix ...
Small molecules such as NO, O2, CO or H2 are important biological ligands that bind to metalloproteins to function crucially in processes such as signal transduction, respiration and catalysis. A key issue for understanding the regulation of reaction mechanisms in these systems is whether ligands gain access to the binding sites through specific channels and docking sites, or by random diffusion through the protein matrix. A model system for studying this issue is myoglobin, a simple haem protein. Myoglobin has been studied extensively by spectroscopy, crystallography, computation and theory. It serves as an aid to oxygen diffusion but also binds carbon monoxide, a byproduct of endogenous haem catabolism. Molecular dynamics simulations, random mutagenesis and flash photolysis studies indicate that ligand migration occurs through a limited number of pathways involving docking sites. Here we report the 1.4 A resolution crystal structure of a ligand-binding intermediate in carbonmonoxy myoglobin that may have far-reaching implications for understanding the dynamics of ligand binding and catalysis.
Related Citations:
A Myoglobin Variant with a Polar Substitution in a Conserved Hydrophobic Cluster in the Heme Binding Pocket Maurus, R., Overall, C.M., Bogumil, R., Luo, Y., Mauk, A.G., Smith, M., Brayer, G.D. (1997) Biochim Biophys Acta 1341: 1
Crystal Structure of Photolysed Myoglobin Schlichting, I., Berendzen, J., Phillips Jr, G.N., Sweet, R.M. (1994) Nature 371: 808
Crystallization and Preliminary Diffraction Data for Horse Heart Metmyoglobin Sherwood, C., Mauk, A.G., Brayer, G.D. (1987) J Mol Biol 193: 227
Organizational Affiliation:
P-21 Biophysics Group, Los Alamos National Laboratory, New Mexico, 87545, USA. kelvin.chu@uvm.edu
Download Mendeley
