1EJG image
Entry Detail
PDB ID:
1EJG
Keywords:
Title:
CRAMBIN AT ULTRA-HIGH RESOLUTION: VALENCE ELECTRON DENSITY.
Biological Source:
PDB Version:
Deposition Date:
2000-03-02
Release Date:
2000-04-05
Method Details:
Experimental Method:
Resolution:
0.54 Å
R-Value Free:
0.09
R-Value Work:
0.09
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:CRAMBIN (PRO22,SER22/LEU25,ILE25)
Chain IDs:A
Chain Length:46
Number of Molecules:1
Biological Source:Crambe hispanica subsp. abyssinica
Ligand Molecules
Primary Citation
Accurate protein crystallography at ultra-high resolution: valence electron distribution in crambin.
Proc.Natl.Acad.Sci.USA 97 3171 3176 (2000)
PMID: 10737790 DOI: 10.1073/pnas.97.7.3171

Abstact

The charge density distribution of a protein has been refined experimentally. Diffraction data for a crambin crystal were measured to ultra-high resolution (0.54 A) at low temperature by using short-wavelength synchrotron radiation. The crystal structure was refined with a model for charged, nonspherical, multipolar atoms to accurately describe the molecular electron density distribution. The refined parameters agree within 25% with our transferable electron density library derived from accurate single crystal diffraction analyses of several amino acids and small peptides. The resulting electron density maps of redistributed valence electrons (deformation maps) compare quantitatively well with a high-level quantum mechanical calculation performed on a monopeptide. This study provides validation for experimentally derived parameters and a window into charge density analysis of biological macromolecules.

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