4LZX

Complex of IQCG and Ca2+-free CaM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.154 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Functional and molecular features of the calmodulin-interacting protein IQCG required for haematopoiesis in zebrafish

Chen, L.T.Liang, W.X.Chen, S.Li, R.K.Tan, J.L.Xu, P.F.Luo, L.F.Wang, L.Yu, S.H.Meng, G.Li, K.K.Liu, T.X.Chen, Z.Chen, S.J.

(2014) Nat Commun 5: 3811-3811

  • DOI: 10.1038/ncomms4811
  • Primary Citation of Related Structures:  
    4LZX, 4M1L

  • PubMed Abstract: 
  • We previously reported a fusion protein NUP98-IQCG in an acute leukaemia, which functions as an aberrant regulator of transcriptional expression, yet the structure and function of IQCG have not been characterized. Here we use zebrafish to investigate the role of iqcg in haematopoietic development, and find that the numbers of haematopoietic stem cells and multilineage-differentiated cells are reduced in iqcg-deficient embryos ...

    We previously reported a fusion protein NUP98-IQCG in an acute leukaemia, which functions as an aberrant regulator of transcriptional expression, yet the structure and function of IQCG have not been characterized. Here we use zebrafish to investigate the role of iqcg in haematopoietic development, and find that the numbers of haematopoietic stem cells and multilineage-differentiated cells are reduced in iqcg-deficient embryos. Mechanistically, IQCG binds to calmodulin (CaM) and acts as a molecule upstream of CaM-dependent kinase IV (CaMKIV). Crystal structures of complexes between CaM and IQ domain of IQCG reveal dual CaM-binding footprints in this motif, and provide a structural basis for a higher CaM-IQCG affinity when deprived of calcium. The results collectively allow us to understand IQCG-mediated calcium signalling in haematopoiesis, and propose a model in which IQCG stores CaM at low cytoplasmic calcium concentrations, and releases CaM to activate CaMKIV when calcium level rises.


    Organizational Affiliation

    1] State Key Laboratory of Medical Genomics and Shanghai, Institute of Hematology, Rui Jin Hospital affiliated to Shanghai Jiao Tong University (SITU) School of Medicine, Shanghai, 200025, China [2] Institute of Health Sciences, Shanghai Institutes for Biological Sciences and Graduate School, Chinese Academy of Sciences and SITU School of Medicine, Shanghai 200025, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CalmodulinA148Homo sapiensMutation(s): 0 
Gene Names: 
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3...
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3CAMCCAMIII

UniProt & NIH Common Fund Data Resources
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
PHAROS:  P0DP23
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
IQ domain-containing protein GB40Homo sapiensMutation(s): 0 
Gene Names: IQCGDRC9
UniProt & NIH Common Fund Data Resources
Find proteins for Q9H095 (Homo sapiens)
Explore Q9H095 
Go to UniProtKB:  Q9H095
PHAROS:  Q9H095
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.154 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.577α = 90
b = 60.922β = 90
c = 64.44γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-05-07
    Type: Initial release
  • Version 1.1: 2015-02-25
    Changes: Database references