5CM9 image
Deposition Date 2015-07-16
Release Date 2016-01-13
Last Version Date 2024-01-10
Entry Detail
PDB ID:
5CM9
Keywords:
SIGNALING PROTEIN
Title:
Structural Basis for the Selectivity of Guanine Nucleotide Exchange Factors for the small G-protein Ral
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Drosophila melanogaster (Taxon ID: 7227)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.60 Å
R-Value Free:
0.31
R-Value Work:
0.27
R-Value Observed:
0.27
Space Group:
C 1 2 1
5CM9 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Ral guanine nucleotide dissociation stimulator-like 2
Gene (Uniprot):Rgl2
Chain IDs:A, B
Chain Length:473
Number of Molecules:2
Biological Source:Mus musculus
UniProt ID:Q61193 Pfam ID:PF00618, PF00617 EC:6.2.1.3
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Ras-related protein Ral-a
Gene (Uniprot):Rala
Chain IDs:C, D
Chain Length:203
Number of Molecules:2
Biological Source:Drosophila melanogaster
UniProt ID:P48555 Pfam ID:PF00071
Primary Citation
The structure of the Guanine Nucleotide Exchange Factor Rlf in complex with the small G-protein Ral identifies conformational intermediates of the exchange reaction and the basis for the selectivity.
J.Struct.Biol. 193 106 114 (2016)
PMID: 26687416 DOI: 10.1016/j.jsb.2015.12.006

Abstact

CDC25 homology domain (CDC25-HD) containing Guanine Nucleotide Exchange Factors (GEFs) initiate signalling by small G-proteins of the Ras-family. Each GEF acts on a small subset of the G-proteins only, thus providing signalling selectivity. Rlf is a GEF with selectivity for the G-proteins RalA and RalB. Here the crystal structure of Rlf in complex with Ral is determined. The Rlf·Ral complex crystallised into two different crystal forms, which represent different steps of the exchange reaction. Thereby general insight in the CDC25-HD catalysed nucleotide exchange is obtained. In addition, the basis for the selectivity of the interaction is investigated. The exchange activity is monitored by the use of recombinant proteins. Selectivity determinants in the binding interface are identified and confirmed by a mutational study.

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Primary Citation of related structures
5CM8