4PSQ

Crystal Structure of Retinol-Binding Protein 4 (RBP4) in complex with a non-retinoid ligand

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.244 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.0 of the entry. See complete history. 


Literature

Structure-assisted discovery of the first non-retinoid ligands for Retinol-Binding Protein 4.

Wang, Y., Connors, R., Fan, P., Wang, X., Wang, Z., Liu, J., Kayser, F., Medina, J.C., Johnstone, S., Xu, H., Thibault, S., Walker, N., Conn, M., Zhang, Y., Liu, Q., Grillo, M.P., Motani, A., Coward, P., Wang, Z.

(2014) Bioorg Med Chem Lett 24: 2885-2891

  • DOI: 10.1016/j.bmcl.2014.04.089
  • Primary Citation of Related Structures:  
    4O9S, 4PSQ

  • PubMed Abstract: 

    • Retinol-Binding Protein 4 (RBP4) is a plasma protein that transports retinol (vitamin A) from the liver to peripheral tissues. This Letter highlights our efforts in discovering the first, to our knowledge, non-retinoid small molecules that bind to RBP4 at the retinol site and reduce serum RBP4 levels in mice, by disrupting the interaction between RBP4 and transthyretin (TTR), a plasma protein that binds RBP4 and protects it from renal excretion ...

    Retinol-Binding Protein 4 (RBP4) is a plasma protein that transports retinol (vitamin A) from the liver to peripheral tissues. This Letter highlights our efforts in discovering the first, to our knowledge, non-retinoid small molecules that bind to RBP4 at the retinol site and reduce serum RBP4 levels in mice, by disrupting the interaction between RBP4 and transthyretin (TTR), a plasma protein that binds RBP4 and protects it from renal excretion. Potent compounds were discovered and optimized quickly from high-throughput screen (HTS) hits utilizing a structure-based approach. Inhibitor co-crystal X-ray structures revealed unique disruptions of RBP4-TTR interactions by our compounds through induced loop conformational changes instead of steric hindrance exemplified by fenretinide. When administered to mice, A1120, a representative compound in the series, showed concentration-dependent retinol and RBP4 lowering.

    Organizational Affiliation: 

    Department of Therapeutic Discovery, Amgen Inc., 1120 Veterans Boulevard, South San Francisco, CA 94080, USA. Electronic address: zwang@amgen.com.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Retinol-binding protein 4B [auth A],
A [auth B]		212Homo sapiensMutation(s): 0 
Gene Names: RBP4, PRO2222
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P02753 (Homo sapiens)
Explore P02753 
Go to UniProtKB:  P02753
PHAROS:  P02753
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02753
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2WL
Query on 2WL
Download Ideal Coordinates CCD File 
C [auth B],
M [auth A]		(1-benzyl-1H-imidazol-4-yl)[4-(2-chlorophenyl)piperazin-1-yl]methanone
C21 H21 Cl N4 O
ITFKVPSANNTLSY-UHFFFAOYSA-N		 Ligand Interaction
PO4
Query on PO4
Download Ideal Coordinates CCD File 
D [auth B],
N [auth A]		PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K		 Ligand Interaction
EDO
Query on EDO
Download Ideal Coordinates CCD File 
E [auth B],
F [auth B],
G [auth B],
H [auth B],
I [auth B],
E [auth B],
F [auth B],
G [auth B],
H [auth B],
I [auth B],
J [auth B],
K [auth B],
L [auth B],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
T [auth A],
U [auth A],
V [auth A],
W [auth A],
X [auth A],
Y [auth A],
Z [auth A]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
2WL Binding MOAD:  4PSQ IC50: 440 (nM) from 1 assay(s)
BindingDB:  4PSQ IC50: 440 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.244 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.531α = 90
b = 96.531β = 90
c = 118.072γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-07-02
    Type: Initial release