5MXX

Crystal structure of human SR protein kinase 1 (SRPK1) in complex with compound 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 

Starting Models: experimental
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Development of Potent, Selective SRPK1 Inhibitors as Potential Topical Therapeutics for Neovascular Eye Disease.

Batson, J.Toop, H.D.Redondo, C.Babaei-Jadidi, R.Chaikuad, A.Wearmouth, S.F.Gibbons, B.Allen, C.Tallant, C.Zhang, J.Du, C.Hancox, J.C.Hawtrey, T.Da Rocha, J.Griffith, R.Knapp, S.Bates, D.O.Morris, J.C.

(2017) ACS Chem Biol 12: 825-832

  • DOI: https://doi.org/10.1021/acschembio.6b01048
  • Primary Citation of Related Structures:  
    5MXX, 5MY8, 5MYV

  • PubMed Abstract: 

    Serine/arginine-protein kinase 1 (SRPK1) regulates alternative splicing of VEGF-A to pro-angiogenic isoforms and SRPK1 inhibition can restore the balance of pro/antiangiogenic isoforms to normal physiological levels. The lack of potency and selectivity of available compounds has limited development of SRPK1 inhibitors, with the control of alternative splicing by splicing factor-specific kinases yet to be translated. We present here compounds that occupy a binding pocket created by the unique helical insert of SRPK1, and trigger a backbone flip in the hinge region, that results in potent (<10 nM) and selective inhibition of SRPK1 kinase activity. Treatment with these inhibitors inhibited SRPK1 activity and phosphorylation of serine/arginine splicing factor 1 (SRSF1), resulting in alternative splicing of VEGF-A from pro-angiogenic to antiangiogenic isoforms. This property resulted in potent inhibition of blood vessel growth in models of choroidal angiogenesis in vivo. This work identifies tool compounds for splice isoform selective targeting of pro-angiogenic VEGF, which may lead to new therapeutic strategies for a diversity of diseases where dysfunctional splicing drives disease development.


  • Organizational Affiliation

    Exonate Ltd , Unit 23, Cambridge Science Park, Cambridge, United Kingdom.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SRPK1399Homo sapiensMutation(s): 0 
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for Q96SB4 (Homo sapiens)
Explore Q96SB4 
Go to UniProtKB:  Q96SB4
PHAROS:  Q96SB4
GTEx:  ENSG00000096063 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96SB4
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
W4A
Query on W4A

Download Ideal Coordinates CCD File 
B [auth A]5-methyl-~{N}-[2-(4-methylpiperazin-1-yl)-5-(trifluoromethyl)phenyl]furan-2-carboxamide
C18 H20 F3 N3 O2
STWLHUZLPCVTAS-UHFFFAOYSA-N
TRS
Query on TRS

Download Ideal Coordinates CCD File 
S [auth A]2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
EDO
Query on EDO

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
G [auth A]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
O [auth A],
P [auth A],
Q [auth A],
R [auth A]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Binding Affinity Annotations 
IDSourceBinding Affinity
W4A BindingDB:  5MXX IC50: 31 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.173 
  • R-Value Observed: 0.175 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 82.572α = 90
b = 82.572β = 90
c = 133.837γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2017-05-24
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description