2QCQ

Crystal structure of Bone Morphogenetic Protein-3 (BMP-3)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

BMP-3 and BMP-6 Structures Illuminate the Nature of Binding Specificity with Receptors.

Allendorph, G.P.Isaacs, M.J.Kawakami, Y.Belmonte, J.C.Choe, S.

(2007) Biochemistry 46: 12238-12247

  • DOI: 10.1021/bi700907k
  • Primary Citation of Related Structures:  
    2QCW, 2QCQ

  • PubMed Abstract: 
  • Bone morphogenetic proteins (BMPs) are extracellular messenger ligands involved in controlling a wide array of developmental and intercellular signaling processes. To initiate their specific intracellular signaling pathways, the ligands recognize and ...

    Bone morphogenetic proteins (BMPs) are extracellular messenger ligands involved in controlling a wide array of developmental and intercellular signaling processes. To initiate their specific intracellular signaling pathways, the ligands recognize and bind two structurally related serine/threonine kinase receptors, termed type I and type II, on the cell surface. Here, we present the crystal structures of BMP-3 and BMP-6, of which BMP-3 has remained poorly understood with respect to its receptor identity, affinity, and specificity. Using surface plasmon resonance (BIAcore) we show that BMP-3 binds Activin Receptor type II (ActRII) with Kd approximately 1.8 microM but ActRIIb with 30-fold higher affinity at Kd approximately 53 nM. This low affinity for ActRII may involve Ser-28 and Asp-33 of BMP-3, which are found only in BMP-3's type II receptor-binding interfaces. Point mutations of either residue to alanine results in up to 20-fold higher affinity to either receptor. We further demonstrate by Smad-based whole cell luciferase assays that the increased affinity of BMP-3S28A to ActRII enables the ligand's signaling ability to a level comparable to that of BMP-6. Focusing on BMP-3's preference for ActRIIb, we find that Lys-76 of ActRII and the structurally equivalent Glu-76 of ActRIIb are distinct between the two receptors. We demonstrate that ActRIIbE76K and ActRII bind BMP-3 with similar affinity, indicating BMP-3 receptor specificity is controlled by the interaction of Lys-30 of BMP-3 with Glu-76 of ActRIIb. These studies illustrate how a single amino acid can regulate the specificity of ligand-receptor binding and potentially alter biological signaling and function in vivo.


    Organizational Affiliation

    Structural Biology Laboratory and Gene Expression Laboratory, Salk Institute for Biology Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Bone morphogenetic protein 3A, B110Homo sapiensMutation(s): 0 
Gene Names: BMP3BMP3A
Find proteins for P12645 (Homo sapiens)
Explore P12645 
Go to UniProtKB:  P12645
NIH Common Fund Data Resources
PHAROS  P12645
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.230 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.85α = 90
b = 96.85β = 90
c = 101.48γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2007-06-19 
  • Released Date: 2007-10-23 
  • Deposition Author(s): Allendorph, G.P.

Revision History 

  • Version 1.0: 2007-10-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Derived calculations, Version format compliance