1l2k

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spinqualitylabelsall models 1l2k, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Neutron Structure Determination of Sperm Whale Met-Myoglobin at 1.5A Resolution.

Overview

From the first days of protein neutron structure determination sperm whale, myoglobin was an object under investigation [Nature 224 (1969) 143, J., Mol. Biol. 220 (1991) 381]. Nevertheless myoglobin is still of interest, [Proc. Natl. Acad. Sci. USA 97 (2000) 3872]. The feasibility of the, monochromatic neutron diffractometer BIX-3 at the JRR-3M reactor at the, JAERI [J. Phys. Chem. Solids 60 (1999) 1623], to collect high-resolution, diffraction data in a relatively short time stimulated us to repeat the, structural determination of myoglobin. The structure of metmyoglobin has, been determined up to a resolution of 1.5 A. The hydrogen atoms were, replaced in part, by deuterium soaking the crystals for more than 10 years, in D(2)O. A refinement of all atoms has been performed including the, refinement of individual mean square displacements and occupancies of the, exchangeable protons in backbone hydrogen bonds. A method is described to, show clear negative scattering densities of the H atoms. Water molecules, within the protein and on the molecule surface are shown. The, exchangeability of H atoms is correlated with structural distribution and, flexibility.

About this Structure

1L2K is a Single protein structure of sequence from Physeter catodon with SO4, ND4, HEM and DOD as ligands. Full crystallographic information is available from OCA.

Reference

Hydrogen and deuterium in myoglobin as seen by a neutron structure determination at 1.5 A resolution., Ostermann A, Tanaka I, Engler N, Niimura N, Parak FG, Biophys Chem. 2002 Mar 28;95(3):183-93. PMID:12062378

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