4FC1 image
Entry Detail
PDB ID:
4FC1
Title:
Ultra-high resolution neutron structure of crambin at room-temperature
Biological Source:
PDB Version:
Deposition Date:
2012-05-23
Release Date:
2012-09-19
Method Details:
Experimental Method:
Resolution:
1.10 Å
R-Value Free:
0.25
R-Value Observed:
0.21
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Crambin
Chain IDs:A
Chain Length:46
Number of Molecules:1
Biological Source:Crambe hispanica subsp. abyssinica
Ligand Molecules
Primary Citation
Direct observation of hydrogen atom dynamics and interactions by ultrahigh resolution neutron protein crystallography.
Proc.Natl.Acad.Sci.USA 109 15301 15306 (2012)
PMID: 22949690 DOI: 10.1073/pnas.1208341109

Abstact

The 1.1 Å, ultrahigh resolution neutron structure of hydrogen/deuterium (H/D) exchanged crambin is reported. Two hundred ninety-nine out of 315, or 94.9%, of the hydrogen atom positions in the protein have been experimentally derived and resolved through nuclear density maps. A number of unconventional interactions are clearly defined, including a potential O─H…π interaction between a water molecule and the aromatic ring of residue Y44, as well as a number of potential C─H…O hydrogen bonds. Hydrogen bonding networks that are ambiguous in the 0.85 Å ultrahigh resolution X-ray structure can be resolved by accurate orientation of water molecules. Furthermore, the high resolution of the reported structure has allowed for the anisotropic description of 36 deuterium atoms in the protein. The visibility of hydrogen and deuterium atoms in the nuclear density maps is discussed in relation to the resolution of the neutron data.

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Primary Citation of related structures