cAMP bound PfPKA-R (297-441)

Experimental Data Snapshot

  • Resolution: 1.15 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 

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Ligand Structure Quality Assessment 

This is version 1.4 of the entry. See complete history


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: https://doi.org/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). 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

    From the Infection and Immunity Program and Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, and.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CAMP-dependent protein kinase regulatory subunit
A, B
148Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PKArPFL1110c
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
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CMP

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C10 H12 N5 O6 P
Binding Affinity Annotations 
IDSourceBinding Affinity
CMP Binding MOAD:  5K8S Kd: 6 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.15 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.28α = 90
b = 71.82β = 90
c = 106.47γ = 90
Software Package:
Software NamePurpose
iMOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-10-12
    Type: Initial release
  • Version 1.1: 2016-10-26
    Changes: Database references
  • Version 1.2: 2016-12-14
    Changes: Database references
  • Version 1.3: 2020-02-26
    Changes: Data collection
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description