ISDA

Deposition Date 2010-04-14

Release Date 2010-11-24

Last Version Date 2024-10-09

Entry Detail

PDB ID:

2XBR

Keywords:

HYDROLASE

Title:

Raman crystallography of Hen White Egg Lysozyme - Low X-ray dose (0.2 MGy)

Biological Source:

Source Organism:

GALLUS GALLUS (Taxon ID: 9031)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.29 Å

R-Value Free:

0.18

R-Value Work:

0.14

R-Value Observed:

0.14

Space Group:

P 43 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:LYSOZYME C
Gene (Uniprot):LYZ
Chain IDs:A
Chain Length:129
Number of Molecules:1
Biological Source:GALLUS GALLUS

UniProt ID:P00698 Pfam ID:PF00062 EC:3.2.1.17

Ligand Molecules

Primary Citation

Raman Assisted Crystallography Reveals a Mechanism of X-Ray Induced Reversible Disulfide Radical Formation

Carpentier, P, Royant, A, Weik, M, Bourgeois, D.Show

Structure 18 1410 ? (2010)

PMID: 21070940 DOI: 10.1016/J.STR.2010.09.010

Abstact

X-ray-induced chemistry modifies biological macromolecules structurally and functionally, even at cryotemperatures. The mechanisms of x-radiation damage in colored or redox proteins have often been investigated by combining X-ray crystallography with in crystallo-ultraviolet-visible spectroscopy. Here, we used Raman microspectrophotometry to follow the onset of damage in crystalline lysozyme, notably that of disulfide bond breakage. The dose-dependent Raman spectra are consistent with a kinetic model for the rupture of disulfide bonds suggesting the rapid build up of an anionic radical intermediate. This intermediate may either revert back to the oxidized state or evolve toward protonated radical species or cleaved products. The data strongly suggest that back conversion of the anionic radical is significantly accelerated by X-rays, revealing an X-ray-induced "repair" mechanism. The possibility of X-ray-induced chemical repair is an important feature to take into account when assessing radiation damage in macromolecules.

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