Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: isothermal titration calorimetry

Macromolecule Content

• Total Structure Weight: 11.87 kDa 
• Atom Count: 947 
• Residue Count: 103 
• Unique protein chains: 2

5WOU

Crystal Structure of drosophila melanogaster Scribble PDZ1 domain in complex with Guk-Holder

• DOI: 10.2210/pdb5WOU/pdb

• Classification: CELL ADHESION
• Organism(s): Drosophila melanogaster
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2017-08-03 Released: 2018-02-28 
• Deposition Author(s): Caria, S., Kvansakul, M.
• Funding Organization(s): National Health and Medical Research Council (NHMRC, Australia), Australian Research Council (ARC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.224 
• R-Value Work: 0.197 
• R-Value Observed: 0.198 

Literature

Drosophila melanogasterGuk-holder interacts with the Scribbled PDZ1 domain and regulates epithelial development with Scribbled and Discs Large.

Caria, S., Magtoto, C.M., Samiei, T., Portela, M., Lim, K.Y.B., How, J.Y., Stewart, B.Z., Humbert, P.O., Richardson, H.E., Kvansakul, M.

(2018) J Biol Chem 293: 4519-4531

• PubMed: 29378849 
• DOI: 10.1074/jbc.M117.817528
• Primary Citation of Related Structures:  
  5WOU


• PubMed Abstract: 
  

Epithelial cell polarity is controlled by components of the Scribble polarity module, and its regulation is critical for tissue architecture and cell proliferation and migration. In Drosophila melanogaster , the adaptor protein Guk-holder (Gukh) binds to the Scribbled (Scrib) and Discs Large (Dlg) components of the Scribble polarity module and plays an important role in the formation of neuromuscular junctions. However, Gukh's role in epithelial tissue formation and the molecular basis for the Scrib-Gukh interaction remain to be defined. We now show using isothermal titration calorimetry that the Scrib PDZ1 domain is the major site for an interaction with Gukh. Furthermore, we defined the structural basis of this interaction by determining the crystal structure of the Scrib PDZ1-Gukh complex. The C-terminal PDZ-binding motif of Gukh is located in the canonical ligand-binding groove of Scrib PDZ1 and utilizes an unusually extensive network of hydrogen bonds and ionic interactions to enable binding to PDZ1 with high affinity. We next examined the role of Gukh along with those of Scrib and Dlg in Drosophila epithelial tissues and found that Gukh is expressed in larval-wing and eye-epithelial tissues and co-localizes with Scrib and Dlg at the apical cell cortex. Importantly, we show that Gukh functions with Scrib and Dlg in the development of Drosophila epithelial tissues, with depletion of Gukh enhancing the eye- and wing-tissue defects caused by Scrib or Dlg depletion. Overall, our findings reveal that Scrib's PDZ1 domain functions in the interaction with Gukh and that the Scrib-Gukh interaction has a key role in epithelial tissue development in Drosophila .

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Organizational Affiliation: 

From the Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein lap4	A	100	Drosophila melanogaster	Mutation(s): 0  Gene Names: scrib, smi, vart, CG5462
Find proteins for Q7KRY7 (Drosophila melanogaster) Explore Q7KRY7  Go to UniProtKB:  Q7KRY7

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
GUK-holder, isoform A	V	8	Drosophila melanogaster	Mutation(s): 0  Gene Names:  gukh, anon-WO0118547.205, CG14287, CG14288, CG5456, CG6003, Dmel\CG31043, GUKH, GUKh, GukH, Gukh, CG31043, Dmel_CG31043
Find proteins for Q9VE13 (Drosophila melanogaster) Explore Q9VE13  Go to UniProtKB:  Q9VE13

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PGE	A	TRIETHYLENE GLYCOL C6 H14 O4 ZIBGPFATKBEMQZ-UHFFFAOYSA-N
EDO	A	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.224 
• R-Value Work: 0.197 
• R-Value Observed: 0.198 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 36.429	α = 90
b = 53.884	β = 90
c = 94.219	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-08-03 
• Released Date: 2018-02-28 
Deposition Author(s): Caria, S., Kvansakul, M.

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Funding Organization	Location	Grant Number
National Health and Medical Research Council (NHMRC, Australia)	Australia	APP1103871
Australian Research Council (ARC)	Australia	FT130101349

Revision History 

• Version 1.0: 2018-02-28
  Type: Initial release
  
• Version 1.1: 2018-04-04
  Changes: Data collection, Database references
• Version 1.2: 2020-01-01
  Changes: Author supporting evidence