1PLJ image
Deposition Date 1994-03-13
Release Date 1994-07-31
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1PLJ
Title:
CRYSTALLOGRAPHIC STUDIES ON P21H-RAS USING SYNCHROTRON LAUE METHOD: IMPROVEMENT OF CRYSTAL QUALITY AND MONITORING OF THE GTPASE REACTION AT DIFFERENT TIME POINTS
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Method Details:
Experimental Method:
Resolution:
2.80 Å
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:C-H-RAS P21 PROTEIN
Gene (Uniprot):HRAS
Chain IDs:A
Chain Length:166
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Crystallographic studies on p21(H-ras) using the synchrotron Laue method: improvement of crystal quality and monitoring of the GTPase reaction at different time points.
Acta Crystallogr.,Sect.D 50 512 520 (1994)
PMID: 15299412 DOI: 10.1107/S090744499301443X

Abstact

The parameters affecting the crystal quality of complexes between p21(H-ras) and caged GTP have been investigated. The use of pure diastereomers of caged GTP complexed to the more stable p21(G12P)' mutant of p21 and the addition of n-octyl-beta-D-glucopyranoside improved the reproducibility and decreased the mosaicity of the crystals significantly. Furthermore, the crystallization technique was changed from the batch method to the sitting-drop technique. With the availability of a larger yield of well ordered crystals, it was possible to extend the time-resolved crystallographic investigations on p21(H-ras). A structure of p21(G12P)':GTP could be obtained 2 min after photolytic removal of the cage group and led to the identification of a previously unidentified conformation for the so-called catalytically active loop L4. The refinement of five data sets collected within 2 min at different times (2-4, 11-13, 20-22, 30-32 and 90-92 min) after the initiation of the intrinsic GTPase reaction of the protein indicates that the synchrotron Laue method can be used to detect small structural changes and alternative conformations, but is presently limited in the analysis of larger rearrangements since these produce diffuse and broken electron density.

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