4WB7

Crystal structure of a chimeric fusion of human DnaJ (Hsp40) and cAMP-dependent protein kinase A (catalytic alpha subunit)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Structural insights into mis-regulation of protein kinase A in human tumors.

Cheung, J.Ginter, C.Cassidy, M.Franklin, M.C.Rudolph, M.J.Robine, N.Darnell, R.B.Hendrickson, W.A.

(2015) Proc Natl Acad Sci U S A 112: 1374-1379

  • DOI: https://doi.org/10.1073/pnas.1424206112
  • Primary Citation of Related Structures:  
    4WB5, 4WB6, 4WB7, 4WB8

  • PubMed Abstract: 

    The extensively studied cAMP-dependent protein kinase A (PKA) is involved in the regulation of critical cell processes, including metabolism, gene expression, and cell proliferation; consequentially, mis-regulation of PKA signaling is implicated in tumorigenesis. Recent genomic studies have identified recurrent mutations in the catalytic subunit of PKA in tumors associated with Cushing's syndrome, a kidney disorder leading to excessive cortisol production, and also in tumors associated with fibrolamellar hepatocellular carcinoma (FL-HCC), a rare liver cancer. Expression of a L205R point mutant and a DnaJ-PKA fusion protein were found to be linked to Cushing's syndrome and FL-HCC, respectively. Here we reveal contrasting mechanisms for increased PKA signaling at the molecular level through structural determination and biochemical characterization of the aberrant enzymes. In the Cushing's syndrome disorder, we find that the L205R mutation abolishes regulatory-subunit binding, leading to constitutive, cAMP-independent signaling. In FL-HCC, the DnaJ-PKA chimera remains under regulatory subunit control; however, its overexpression from the DnaJ promoter leads to enhanced cAMP-dependent signaling. Our findings provide a structural understanding of the two distinct disease mechanisms and they offer a basis for designing effective drugs for their treatment.


  • Organizational Affiliation

    New York Structural Biology Center, New York, NY 10027; [email protected] [email protected].


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DnaJ homolog subfamily B member 1,cAMP-dependent protein kinase catalytic subunit alpha
A, B
405Homo sapiensMutation(s): 0 
Gene Names: DNAJB1DNAJ1HDJ1HSPF1PRKACAPKACA
EC: 2.7.11.11
UniProt & NIH Common Fund Data Resources
Find proteins for P17612 (Homo sapiens)
Explore P17612 
Go to UniProtKB:  P17612
PHAROS:  P17612
GTEx:  ENSG00000072062 
Find proteins for P25685 (Homo sapiens)
Explore P25685 
Go to UniProtKB:  P25685
PHAROS:  P25685
GTEx:  ENSG00000132002 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP17612P25685
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
PKI (5-24)C [auth I],
D [auth J]
20Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P61925 (Homo sapiens)
Explore P61925 
Go to UniProtKB:  P61925
PHAROS:  P61925
GTEx:  ENSG00000171033 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP61925
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download Ideal Coordinates CCD File 
E [auth A],
L [auth B]
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
F [auth A]
G [auth A]
H [auth A]
I [auth A]
J [auth A]
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B],
Q [auth I],
R [auth I],
S [auth I],
T [auth J],
U [auth J]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Modified Residues  2 Unique
IDChains TypeFormula2D DiagramParent
SEP
Query on SEP
A, B
L-PEPTIDE LINKINGC3 H8 N O6 PSER
TPO
Query on TPO
A, B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.233α = 90
b = 121.155β = 90
c = 173.672γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2015-02-04
    Changes: Database references
  • Version 1.2: 2015-02-11
    Changes: Database references
  • Version 1.3: 2015-02-25
    Changes: Derived calculations
  • Version 1.4: 2017-11-22
    Changes: Advisory, Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary
  • Version 1.5: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description