5T3N

Sp-2Cl-cAMPS bound to PKAR CBD2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 

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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history. 


Literature

Disrupting the Allosteric Interaction between the Plasmodium falciparum cAMP-dependent Kinase and Its Regulatory Subunit.

Littler, D.R., Bullen, H.E., Harvey, K.L., Beddoe, T., Crabb, B.S., Rossjohn, J., Gilson, P.R.

(2016) J Biol Chem 291: 25375-25386

  • DOI: 10.1074/jbc.M116.750174
  • Primary Citation of Related Structures:  
    5K8S, 5KBF, 5T3N

  • PubMed Abstract: 

    • The ubiquitous second messenger cAMP mediates signal transduction processes in the malarial parasite that regulate host erythrocyte invasion and the proliferation of merozoites. In Plasmodium falciparum, the central receptor for cAMP is the single regulatory subunit (R) of protein kinase A (PKA) ...

    The ubiquitous second messenger cAMP mediates signal transduction processes in the malarial parasite that regulate host erythrocyte invasion and the proliferation of merozoites. In Plasmodium falciparum, the central receptor for cAMP is the single regulatory subunit (R) of protein kinase A (PKA). To aid the development of compounds that can selectively dysregulate parasite PKA signaling, we solved the structure of the PKA regulatory subunit in complex with cAMP and a related analogue that displays antimalarial activity, (S p )-2-Cl-cAMPS. Prior to signaling, PKA-R holds the kinase's catalytic subunit (C) in an inactive state by exerting an allosteric inhibitory effect. When two cAMP molecules bind to PKA-R, they stabilize a structural conformation that facilitates its dissociation, freeing PKA-C to phosphorylate downstream substrates such as apical membrane antigen 1. Although PKA activity was known to be necessary for erythrocytic proliferation, we show that uncontrolled induction of PKA activity using membrane-permeable agonists is equally disruptive to growth.

    Organizational Affiliation: 

    the Burnet Institute, Melbourne, Victoria 3004, Australia.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
cAMP-dependent protein kinase regulatory subunitA, B161Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PKAr, PF3D7_1223100, PFL1110c
EC: 2.7.11.11
UniProt
Find proteins for Q7KQK0 (Plasmodium falciparum (isolate 3D7))
Explore Q7KQK0 
Go to UniProtKB:  Q7KQK0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7KQK0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
75G
Query on 75G
Download Ideal Coordinates CCD File 
E [auth A],
I [auth B]		(2S,4aR,6R,7R,7aS)-6-(6-amino-2-chloro-9H-purin-9-yl)-7-hydroxy-2-sulfanyltetrahydro-2H,4H-2lambda~5~-furo[3,2-d][1,3,2]dioxaphosphinin-2-one
C10 H11 Cl N5 O5 P S
PMTFGHJSNPKVBG-FHIGPPGSSA-N		 Ligand Interaction
IOD
Query on IOD
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
F [auth B],
G [auth B],
H [auth B]		IODIDE ION
I
XMBWDFGMSWQBCA-UHFFFAOYSA-M		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
75G Binding MOAD:  5T3N Kd: 9.1 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.251 
  • R-Value Observed: 0.254 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.19α = 90
b = 64.19β = 90
c = 195.71γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Health and Medical Research Council (NHMRC, Australia)Australia--

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2016-10-19
    Changes: Data collection
  • Version 1.2: 2016-11-02
    Changes: Database references
  • Version 1.3: 2016-12-14
    Changes: Database references
  • Version 1.4: 2017-09-20
    Changes: Author supporting evidence, Data collection
  • Version 1.5: 2020-01-08
    Changes: Author supporting evidence