5FPD

Structure of heat shock-related 70kDA protein 2 with small-molecule ligand pyrazine-2-carboxamide (AT513) in an alternate binding site.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.173 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history. 


Literature

Detection of Secondary Binding Sites in Proteins Using Fragment Screening.

Ludlow, R.F., Verdonk, M.L., Saini, H.K., Tickle, I.J., Jhoti, H.

(2015) Proc Natl Acad Sci U S A 112: 15910

  • DOI: 10.1073/pnas.1518946112
  • Primary Citation of Related Structures:  
    5FP5, 5FP6, 5FPD, 5FPE, 5FPM, 5FPN, 5FPO, 5FPR, 5FPS, 5FPT, 5FPY

  • PubMed Abstract: 

    • Proteins need to be tightly regulated as they control biological processes in most normal cellular functions. The precise mechanisms of regulation are rarely completely understood but can involve binding of endogenous ligands and/or partner proteins at specific locations on a protein that can modulate function ...

    Proteins need to be tightly regulated as they control biological processes in most normal cellular functions. The precise mechanisms of regulation are rarely completely understood but can involve binding of endogenous ligands and/or partner proteins at specific locations on a protein that can modulate function. Often, these additional secondary binding sites appear separate to the primary binding site, which, for example for an enzyme, may bind a substrate. In previous work, we have uncovered several examples in which secondary binding sites were discovered on proteins using fragment screening approaches. In each case, we were able to establish that the newly identified secondary binding site was biologically relevant as it was able to modulate function by the binding of a small molecule. In this study, we investigate how often secondary binding sites are located on proteins by analyzing 24 protein targets for which we have performed a fragment screen using X-ray crystallography. Our analysis shows that, surprisingly, the majority of proteins contain secondary binding sites based on their ability to bind fragments. Furthermore, sequence analysis of these previously unknown sites indicate high conservation, which suggests that they may have a biological function, perhaps via an allosteric mechanism. Comparing the physicochemical properties of the secondary sites with known primary ligand binding sites also shows broad similarities indicating that many of the secondary sites may be druggable in nature with small molecules that could provide new opportunities to modulate potential therapeutic targets.

    Organizational Affiliation: 

    Astex Pharmaceuticals, Cambridge CB4 0QA, United Kingdom harren.jhoti@astx.com.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HEAT SHOCK-RELATED 70KDA PROTEIN 2A, B387Homo sapiensMutation(s): 0 
Gene Names: HSPA2
UniProt & NIH Common Fund Data Resources
Find proteins for P54652 (Homo sapiens)
Explore P54652 
Go to UniProtKB:  P54652
PHAROS:  P54652
GTEx:  ENSG00000126803 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP54652
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PZA
Query on PZA
Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]		PYRAZINE-2-CARBOXAMIDE
C5 H5 N3 O
IPEHBUMCGVEMRF-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.173 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.8α = 90
b = 95.062β = 90.03
c = 81.779γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-16
    Type: Initial release
  • Version 1.1: 2015-12-23
    Changes: Database references
  • Version 1.2: 2016-01-13
    Changes: Database references
  • Version 1.3: 2016-04-06
    Changes: Atomic model, Derived calculations, Non-polymer description