ISDA

Deposition Date 2005-12-06

Release Date 2006-03-08

Last Version Date 2024-10-23

Entry Detail

PDB ID:

2C8O

Keywords:

HYDROLASE

Title:

lysozyme (1sec) and UV lasr excited fluorescence

Biological Source:

Source Organism:

GALLUS GALLUS (Taxon ID: 9031)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.50 Å

R-Value Free:

0.20

R-Value Work:

0.19

R-Value Observed:

0.19

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

Primary Citation

Uv Laser-Excited Fluorescence as a Tool for the Visualization of Protein Crystals Mounted in Loops.

Vernede, X, Lavault, B, Ohana, J, Nurizzo, D, Joly, J, Jacquamet, L, Felisaz, F, Cipriani, F, Bourgeois, D.Show

Acta Crystallogr.,Sect.D 62 253 ? (2006)

PMID: 16510972 DOI: 10.1107/S0907444905041429

Abstact

Structural proteomics has promoted the rapid development of automated protein structure determination using X-ray crystallography. Robotics are now routinely used along the pipeline from genes to protein structures. However, a bottleneck still remains. At synchrotron beamlines, the success rate of automated sample alignment along the X-ray beam is limited by difficulties in visualization of protein crystals, especially when they are small and embedded in mother liquor. Despite considerable improvement in optical microscopes, the use of visible light transmitted or reflected by the sample may result in poor or misleading contrast. Here, the endogenous fluorescence from aromatic amino acids has been used to identify even tiny or weakly fluorescent crystals with a high success rate. The use of a compact laser at 266 nm in combination with non-fluorescent sample holders provides an efficient solution to collect high-contrast fluorescence images in a few milliseconds and using standard camera optics. The best image quality was obtained with direct illumination through a viewing system coaxial with the UV beam. Crystallographic data suggest that the employed UV exposures do not generate detectable structural damage.

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