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 

wwPDB Validation   3D Report Full Report


This is version 1.4 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: 10.1073/pnas.1424206112
  • Primary Citation of Related Structures:  
    4WB7, 4WB8, 4WB5, 4WB6

  • 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 t ...

    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; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032 jcheung@nysbc.org wayne@xtl.cumc.columbia.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DnaJ homolog subfamily B member 1,cAMP-dependent protein kinase catalytic subunit alphaAB405Homo sapiensMutation(s): 0 
Gene Names: DNAJB1DNAJ1HDJ1HSPF1
EC: 2.7.11.11
Find proteins for P17612 (Homo sapiens)
Explore P17612 
Go to UniProtKB:  P17612
NIH Common Fund Data Resources
PHAROS  P17612
Find proteins for P25685 (Homo sapiens)
Explore P25685 
Go to UniProtKB:  P25685
NIH Common Fund Data Resources
PHAROS  P25685
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
PKI (5-24)IJ20Homo sapiensMutation(s): 0 
Gene Names: PKIAPRKACN1
Find proteins for P61925 (Homo sapiens)
Explore P61925 
Go to UniProtKB:  P61925
NIH Common Fund Data Resources
PHAROS  P61925
Protein Feature View
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  • Reference Sequence
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

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • 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