3MMK

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.157 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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. --: --

  • DOI: 10.1074/jbc.M111.248559

  • 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 express ...

    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.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Fusion of LIM/homeobox protein Lhx4, linker, Insulin gene enhancer protein ISL-2
A, B
169Mus musculusMutation(s): 0 
Gene Names: Isl2, Lhx4 (Gsh-4, Gsh4)
Find proteins for Q9CXV0 (Mus musculus)
Go to UniProtKB:  Q9CXV0
Find proteins for P53776 (Mus musculus)
Go to UniProtKB:  P53776
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.157 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 46.823α = 90.00
b = 88.734β = 111.85
c = 49.851γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
HKL-2000data reduction
ADSCdata collection
HKL-2000data scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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