Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 37.96 kDa 
• Atom Count: 2236 
• Modelled Residue Count: 305 
• Deposited Residue Count: 338 
• Unique protein chains: 1

3MMK

The structural basis for partial redundancy in a class of transcription factors, the lim-homeodomain proteins, in neural cell type specification

• PDB DOI: 10.2210/pdb3MMK/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-04-20 Released: 2011-07-13 
• Deposition Author(s): Gadd, M.S., Langley, D.B., Guss, J.M., Matthews, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.16 Å
• R-Value Free: 0.265 
• R-Value Work: 0.235 
• R-Value Observed: 0.237 

Literature

The structural basis for partial redundancy in a class of transcription factors, the lim-homeodomain proteins, in neural cell type specification.

Gadd, M.S., Bhati, M., Jeffries, C.M., Langley, D.B., Trewhella, J., Guss, J.M., Matthews, J.M.

(2011) J Biol Chem 

• PubMed: 22025611 
• DOI: 10.1074/jbc.M111.248559
• Primary Citation of Related Structures:  
  3MMK


• PubMed Abstract: 
  

Combinations of LIM homeodomain proteins form a transcriptional "LIM code" to direct the specification of neural cell types. Two paralogous pairs of LIM homeodomain proteins, LIM homeobox protein 3/4 (Lhx3/Lhx4) and Islet-1/2 (Isl1/Isl2), are expressed in developing ventral motor neurons. Lhx3 and Isl1 interact within a well characterized transcriptional complex that triggers motor neuron development, but it was not known whether Lhx4 and Isl2 could participate in equivalent complexes. We have identified an Lhx3-binding domain (LBD) in Isl2 based on sequence homology with the Isl1(LBD) and show that both Isl2(LBD) and Isl1(LBD) can bind each of Lhx3 and Lhx4. X-ray crystal- and small-angle x-ray scattering-derived solution structures of an Lhx4·Isl2 complex exhibit many similarities with that of Lhx3·Isl1; however, structural differences supported by mutagenic studies reveal differences in the mechanisms of binding. Differences in binding have implications for the mode of exchange of protein partners in transcriptional complexes and indicate a divergence in functions of Lhx3/4 and Isl1/2. The formation of weaker Lhx·Isl complexes would likely be masked by the availability of the other Lhx·Isl complexes in postmitotic motor neurons.

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Organizational Affiliation: 

School of Molecular Bioscience, The University of Sydney, New South Wales 2006, Australia.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fusion of LIM/homeobox protein Lhx4, linker, Insulin gene enhancer protein ISL-2	A, B	169	Mus musculus	Mutation(s): 0  Gene Names: Gsh-4, Gsh4, Isl2, Lhx4
UniProt
Find proteins for Q9CXV0 (Mus musculus) Explore Q9CXV0  Go to UniProtKB:  Q9CXV0
Find proteins for P53776 (Mus musculus) Explore P53776  Go to UniProtKB:  P53776
UniProt Groups	Q9CXV0P53776

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	C [auth A], D [auth A], E [auth A], F [auth A], J [auth B], K [auth B], L [auth B], M [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CL	G [auth A], H [auth A], I [auth A], N [auth B]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.16 Å
• R-Value Free: 0.265 
• R-Value Work: 0.235 
• R-Value Observed: 0.237 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.823	α = 90
b = 88.734	β = 111.85
c = 49.851	γ = 90

Software Package:

Software Name	Purpose
ADSC	data collection
SOLVE	phasing
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-04-20 
• Released Date: 2011-07-13 
Deposition Author(s): Gadd, M.S., Langley, D.B., Guss, J.M., Matthews, J.M.

Revision History  

• Version 1.0: 2011-07-13
  Type: Initial release
  
• Version 1.1: 2011-11-16
  Changes: Database references, Structure summary
• Version 1.2: 2017-06-28
  Changes: Source and taxonomy