4FAO

Specificity and Structure of a high affinity Activin-like 1 (ALK1) signaling complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.357 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Specificity and Structure of a High Affinity Activin Receptor-like Kinase 1 (ALK1) Signaling Complex.

Townson, S.A.Martinez-Hackert, E.Greppi, C.Lowden, P.Sako, D.Liu, J.Ucran, J.A.Liharska, K.Underwood, K.W.Seehra, J.Kumar, R.Grinberg, A.V.

(2012) J.Biol.Chem. 287: 27313-27325

  • DOI: 10.1074/jbc.M112.377960

  • PubMed Abstract: 
  • Activin receptor-like kinase 1 (ALK1), an endothelial cell-specific type I receptor of the TGF-β superfamily, is an important regulator of normal blood vessel development as well as pathological tumor angiogenesis. As such, ALK1 is an important thera ...

    Activin receptor-like kinase 1 (ALK1), an endothelial cell-specific type I receptor of the TGF-β superfamily, is an important regulator of normal blood vessel development as well as pathological tumor angiogenesis. As such, ALK1 is an important therapeutic target. Thus, several ALK1-directed agents are currently in clinical trials as anti-angiogenic cancer therapeutics. Given the biological and clinical importance of the ALK1 signaling pathway, we sought to elucidate the biophysical and structural basis underlying ALK1 signaling. The TGF-β family ligands BMP9 and BMP10 as well as the three type II TGF-β family receptors ActRIIA, ActRIIB, and BMPRII have been implicated in ALK1 signaling. Here, we provide a kinetic and thermodynamic analysis of BMP9 and BMP10 interactions with ALK1 and type II receptors. Our data show that BMP9 displays a significant discrimination in type II receptor binding, whereas BMP10 does not. We also report the crystal structure of a fully assembled ternary complex of BMP9 with the extracellular domains of ALK1 and ActRIIB. The structure reveals that the high specificity of ALK1 for BMP9/10 is determined by a novel orientation of ALK1 with respect to BMP9, which leads to a unique set of receptor-ligand interactions. In addition, the structure explains how BMP9 discriminates between low and high affinity type II receptors. Taken together, our findings provide structural and mechanistic insights into ALK1 signaling that could serve as a basis for novel anti-angiogenic therapies.


    Organizational Affiliation

    Acceleron Pharma, Cambridge, Massachusetts 02139, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Growth/differentiation factor 2
A, B, G, H, M, N, S, T, a, b, g, h
110Homo sapiensMutation(s): 0 
Gene Names: GDF2 (BMP9)
Find proteins for Q9UK05 (Homo sapiens)
Go to Gene View: GDF2
Go to UniProtKB:  Q9UK05
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase receptor R3
C, D, I, J, O, P, U, V, c, d, i, j
106Homo sapiensMutation(s): 0 
Gene Names: ACVRL1 (ACVRLK1, ALK1)
EC: 2.7.11.30
Find proteins for P37023 (Homo sapiens)
Go to Gene View: ACVRL1
Go to UniProtKB:  P37023
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Activin receptor type-2B
E, F, K, L, Q, R, W, X, e, f, k, l
124Homo sapiensMutation(s): 0 
Gene Names: ACVR2B
EC: 2.7.11.30
Find proteins for Q13705 (Homo sapiens)
Go to Gene View: ACVR2B
Go to UniProtKB:  Q13705
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
e, F, K, k, R, X
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
e, E, F, f, k, K, l, L, Q, R, W, X
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.357 Å
  • R-Value Free: 0.261 
  • R-Value Work: 0.219 
  • Space Group: P 31 1 2
Unit Cell:
Length (Å)Angle (°)
a = 216.453α = 90.00
b = 216.453β = 90.00
c = 216.953γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data collection
DENZOdata reduction
PHENIXrefinement
PHASERphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-20
    Type: Initial release
  • Version 1.1: 2012-07-25
    Type: Database references
  • Version 1.2: 2012-08-29
    Type: Database references