4MIT

Crystal structure of E. histolytica RacC bound to the EhPAK4 PBD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Entamoeba histolytica RacC Selectively Engages p21-Activated Kinase Effectors.

Bosch, D.E.Siderovski, D.P.

(2015) Biochemistry 54: 404-412

  • DOI: 10.1021/bi501226f

  • PubMed Abstract: 
  • Rho family GTPases modulate actin cytoskeleton dynamics by signaling through multiple effectors, including the p21-activated kinases (PAKs). The intestinal parasite Entamoeba histolytica expresses ∼20 Rho family GTPases and seven isoforms of PAK, two ...

    Rho family GTPases modulate actin cytoskeleton dynamics by signaling through multiple effectors, including the p21-activated kinases (PAKs). The intestinal parasite Entamoeba histolytica expresses ∼20 Rho family GTPases and seven isoforms of PAK, two of which have been implicated in pathogenesis-related processes such as amoebic motility and invasion and host cell phagocytosis. Here, we describe two previously unstudied PAK isoforms, EhPAK4 and EhPAK5, as highly specific effectors of EhRacC. A structural model based on 2.35 Å X-ray crystallographic data of a complex between EhRacC(Q65L)·GTP and the EhPAK4 p21 binding domain (PBD) reveals a fairly well-conserved Rho/effector interface despite deviation of the PBD α-helix. A structural comparison with EhRho1 in complex with EhFormin1 suggests likely determinants of Rho family GTPase signaling specificity in E. histolytica. These findings suggest a high degree of Rho family GTPase diversity and specificity in the single-cell parasite E. histolytica. Because PAKs regulate pathogenesis-related processes in E. histolytica, they may be valid pharmacologic targets for anti-amoebiasis drugs.


    Organizational Affiliation

    Department of Pharmacology, The University of North Carolina , Chapel Hill, North Carolina 27514, United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Rho family GTPase
A, B, C, D
186Entamoeba histolyticaMutations: Q68L
Gene Names: RACC
Find proteins for Q24816 (Entamoeba histolytica)
Go to UniProtKB:  Q24816
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine protein kinase PAK, putative
E, F, G, H
70Entamoeba histolytica HM-1:IMSS-A
Find proteins for N9UZ59 (Entamoeba histolytica HM-1:IMSS-A)
Go to UniProtKB:  N9UZ59
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download SDF File 
Download CCD File 
A, B, C, D
GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.176 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.322α = 90.00
b = 211.957β = 102.85
c = 49.780γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXrefinement
PHASERphasing
HKL-2000data scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-09-03
    Type: Initial release
  • Version 1.1: 2015-02-04
    Type: Database references