Macromolecule Content

• Total Structure Weight: 20.45 kDa 
• Atom Count: 1435 
• Residue Count: 174 
• Unique protein chains: 1

2KE5

Solution structure and dynamics of the small GTPase Ralb in its active conformation: significance for effector protein binding

• DOI: 10.2210/pdb2KE5/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2009-01-23 Released: 2009-02-17 
• Deposition Author(s): Fenwick, R., Prasannan, S., Campbell, L.J., Nietlispach, D., Evetts, K.A., Camonis, J., Mott, H.R., Owen, D.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 50 
• Selection Criteria: structures with the lowest energy 

Literature

Solution structure and dynamics of the small GTPase RalB in its active conformation: significance for effector protein binding

Fenwick, R.B., Prasannan, S., Campbell, L.J., Nietlispach, D., Evetts, K.A., Camonis, J., Mott, H.R., Owen, D.

(2009) Biochemistry 48: 2192-2206

• PubMed: 19166349 
• DOI: 10.1021/bi802129d
• Primary Citation of Related Structures:  
  2KE5


• PubMed Abstract: 
  

The small G proteins RalA/B have a crucial function in the regulatory network that couples extracellular signals with appropriate cellular responses. RalA/B are an important component of the Ras signaling pathway and, in addition to their role in membrane trafficking, are implicated in the initiation and maintenance of tumorigenic transformation of human cells. RalA and RalB share 85% sequence identity and collaborate in supporting cancer cell proliferation but have markedly different effects. RalA is important in mediating proliferation, while depletion of RalB results in transformed cells undergoing apoptosis. Crystal structures of RalA in the free form and in complex with its effectors, Sec5 and Exo84, have been solved. Here we have determined the solution structure of free RalB bound to the GTP analogue GMPPNP to an RMSD of 0.6 A. We show that, while the overall architecture of RalB is very similar to the crystal structure of RalA, differences exist in the switch regions, which are sensitive to the bound nucleotide. Backbone 15N dynamics suggest that there are four regions of disorder in RalB: the P-loop, switch I, switch II, and the loop comprising residues 116-121, which has a single residue insertion compared to RalA. 31P NMR data and the structure of RalB.GMPPNP show that the switch regions predominantly adopt state 1 (Ras nomenclature) in the unbound form, which in Ras is not competent to bind effectors. In contrast, 31P NMR analysis of RalB.GTP reveals that conformations corresponding to states 1 and 2 are both sampled in solution and that addition of an effector protein only partially stabilizes state 2.

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Organizational Affiliation: 

Department of Biochemistry, University of Cambridge, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ras-related protein Ral-B	A	174	Homo sapiens	Mutation(s): 1  Gene Names: RALB EC: 3.6.5.2
Find proteins for P11234 (Homo sapiens) Explore P11234  Go to UniProtKB:  P11234
NIH Common Fund Data Resources
PHAROS:  P11234 GTEx:  ENSG00000144118

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GNP	A	PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER C10 H17 N6 O13 P3 UQABYHGXWYXDTK-UUOKFMHZSA-N
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 50 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 2KE5 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-01-23 
• Released Date: 2009-02-17 
Deposition Author(s): Fenwick, R., Prasannan, S., Campbell, L.J., Nietlispach, D., Evetts, K.A., Camonis, J., Mott, H.R., Owen, D.

Revision History 

• Version 1.0: 2009-02-17
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance