4AYA

Crystal structure of ID2 HLH homodimer at 2.1A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 

wwPDB Validation   3D Report Full Report



Literature

A Divalent Ion is Crucial in the Structure and Dominant-Negative Function of Id Proteins, a Class of Helix-Loop-Helix Transcription Regulators.

Wong, M.V.Jiang, S.Palasingam, P.Kolatkar, P.R.

(2012) PLoS One 7: 48591

  • DOI: 10.1371/journal.pone.0048591
  • Primary Citation of Related Structures:  
    4AYA

  • PubMed Abstract: 
  • Inhibitors of DNA binding and differentiation (ID) proteins, a dominant-negative group of helix-loop-helix (HLH) transcription regulators, are well-characterized key players in cellular fate determination during development in mammals as well as Drosophi ...

    Inhibitors of DNA binding and differentiation (ID) proteins, a dominant-negative group of helix-loop-helix (HLH) transcription regulators, are well-characterized key players in cellular fate determination during development in mammals as well as Drosophila. Although not oncogenes themselves, their upregulation by various oncogenic proteins (such as Ras, Myc) and their inhibitory effects on cell cycle proteins (such as pRb) hint at their possible roles in tumorigenesis. Furthermore, their potency as inhibitors of cellular differentiation, through their heterodimerization with subsequent inactivation of the ubiquitous E proteins, suggest possible novel roles in engineering induced pluripotent stem cells (iPSCs). We present the high-resolution 2.1Å crystal structure of ID2 (HLH domain), coupled with novel biochemical insights in the presence of a divalent ion, possibly calcium (Ca2+), in the loop of ID proteins, which appear to be crucial for the structure and activity of ID proteins. These new insights will pave the way for new rational drug designs, in addition to current synthetic peptide options, against this potent player in tumorigenesis as well as more efficient ways for stem cells reprogramming.


    Organizational Affiliation

    Laboratory for Structural Biochemistry, Genome Institute of Singapore, Singapore, Singapore.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-BINDING PROTEIN INHIBITOR ID-2 AB97Homo sapiensMutation(s): 0 
Gene Names: ID2BHLHB26
Find proteins for Q02363 (Homo sapiens)
Explore Q02363 
Go to UniProtKB:  Q02363
NIH Common Fund Data Resources
PHAROS:  Q02363
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download Ideal Coordinates CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
K
Query on K

Download Ideal Coordinates CCD File 
A, B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.227 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.622α = 90
b = 51.622β = 90
c = 111.474γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
SCALEPACKdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-11-14
    Type: Initial release