2RMK

Rac1/PRK1 Complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The Rac1 Polybasic Region Is Required for Interaction with Its Effector PRK1

Modha, R.Campbell, L.J.Nietlispach, D.Buhecha, H.R.Owen, D.Mott, H.R.

(2008) J Biol Chem 283: 1492-1500

  • DOI: https://doi.org/10.1074/jbc.M706760200
  • Primary Citation of Related Structures:  
    2RMK

  • PubMed Abstract: 

    Protein kinase C-related kinase 1 (PRK1 or PKN) is involved in regulation of the intermediate filaments of the actin cytoskeleton, as well as having effects on processes as diverse as mitotic timing and apoptosis. It is activated by interacting with the Rho family small G proteins and arachidonic acid or by caspase cleavage. We have previously shown that the HR1b of PRK1 binds exclusively to Rac1, whereas the HR1a domain binds to both Rac1 and RhoA. Here, we have determined the solution structure of the HR1b-Rac complex. We show that HR1b binds to the C-terminal end of the effector loop and switch 2 of Rac1. Comparison with the HR1a-RhoA structure shows that this part of the Rac1-HR1b interaction is homologous to one of the contact sites that HR1a makes with RhoA. The Rac1 used in this study included the C-terminal polybasic region, which is frequently omitted from structural studies, as well as the core G domain. The Rac1 C-terminal region reverses in direction to interact with residues in switch 2, and the polybasic region itself interacts with residues in HR1b. The interactions with HR1b do not prevent the polybasic region being available to contact the negatively charged membrane phospholipids, which is considered to be its primary role. This is the first structural demonstration that the C terminus of a G protein forms a novel recognition element for effector binding.


  • Organizational Affiliation

    Department of Biochemistry, University of Cambridge, 80, Tennis Court Road, Cambridge CB2 1GA, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ras-related C3 botulinum toxin substrate 1192Homo sapiensMutation(s): 1 
Gene Names: RAC1
EC: 3.6.5.2
UniProt & NIH Common Fund Data Resources
Find proteins for P63000 (Homo sapiens)
Explore P63000 
Go to UniProtKB:  P63000
PHAROS:  P63000
GTEx:  ENSG00000136238 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63000
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase N181Homo sapiensMutation(s): 0 
Gene Names: PKN1PKNPRK1PRKCL1
EC: 2.7.11.13
UniProt & NIH Common Fund Data Resources
Find proteins for Q16512 (Homo sapiens)
Explore Q16512 
Go to UniProtKB:  Q16512
PHAROS:  Q16512
GTEx:  ENSG00000123143 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16512
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GCP
Query on GCP

Download Ideal Coordinates CCD File 
D [auth A]PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER
C11 H18 N5 O13 P3
PHBDHXOBFUBCJD-KQYNXXCUSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
C [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-11-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-11-10
    Changes: Data collection, Database references, Derived calculations
  • Version 1.3: 2024-05-29
    Changes: Data collection