5AQF

Fragment-based screening of HSP70 sheds light on the functional role of ATP-binding site residues


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

A fragment-based approach applied to a highly flexible target: Insights and challenges towards the inhibition of HSP70 isoforms.

Jones, A.M.Westwood, I.M.Osborne, J.D.Matthews, T.P.Cheeseman, M.D.Rowlands, M.G.Jeganathan, F.Burke, R.Lee, D.Kadi, N.Liu, M.Richards, M.McAndrew, C.Yahya, N.Dobson, S.E.Jones, K.Workman, P.Collins, I.van Montfort, R.L.

(2016) Sci Rep 6: 34701-34701

  • DOI: 10.1038/srep34701
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The heat shock protein 70s (HSP70s) are molecular chaperones implicated in many cancers and of significant interest as targets for novel cancer therapies. Several HSP70 inhibitors have been reported, but because the majority have poor physicochemical ...

    The heat shock protein 70s (HSP70s) are molecular chaperones implicated in many cancers and of significant interest as targets for novel cancer therapies. Several HSP70 inhibitors have been reported, but because the majority have poor physicochemical properties and for many the exact mode of action is poorly understood, more detailed mechanistic and structural insight into ligand-binding to HSP70s is urgently needed. Here we describe the first comprehensive fragment-based inhibitor exploration of an HSP70 enzyme, which yielded an amino-quinazoline fragment that was elaborated to a novel ATP binding site ligand with different physicochemical properties to known adenosine-based HSP70 inhibitors. Crystal structures of amino-quinazoline ligands bound to the different conformational states of the HSP70 nucleotide binding domain highlighted the challenges of a fragment-based approach when applied to this particular flexible enzyme class with an ATP-binding site that changes shape and size during its catalytic cycle. In these studies we showed that Ser275 is a key residue in the selective binding of ATP. Additionally, the structural data revealed a potential functional role for the ATP ribose moiety in priming the protein for the formation of the ATP-bound pre-hydrolysis complex by influencing the conformation of one of the phosphate binding loops.


    Organizational Affiliation

    Division of Structural Biology, The Institute of Cancer Research, London SW3 6JB, United Kingdom.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HEAT SHOCK COGNATE 71 KDA PROTEINA, C386Homo sapiensMutation(s): 0 
Gene Names: HSPA8HSC70HSP73HSPA10
EC: 3.6.3.51
Find proteins for P11142 (Homo sapiens)
Explore P11142 
Go to UniProtKB:  P11142
NIH Common Fund Data Resources
PHAROS  P11142
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
BAG FAMILY MOLECULAR CHAPERONE REGULATOR 1B, D118Homo sapiensMutation(s): 0 
Gene Names: BAG1HAP
Find proteins for Q99933 (Homo sapiens)
Explore Q99933 
Go to UniProtKB:  Q99933
NIH Common Fund Data Resources
PHAROS  Q99933
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADN
Query on ADN

Download CCD File 
A, C
ADENOSINE
C10 H13 N5 O4
OIRDTQYFTABQOQ-KQYNXXCUSA-N
 Ligand Interaction
TRS
Query on TRS

Download CCD File 
A, C
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A, B, C, D
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 230.729α = 90
b = 40.74β = 91.16
c = 116.69γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Entry History 

Revision History 

  • Version 1.0: 2016-10-05
    Type: Initial release
  • Version 1.1: 2017-09-13
    Changes: Database references