3IBJ

X-ray structure of PDE2A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.02 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.215 

Starting Models: experimental
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This is version 1.2 of the entry. See complete history


Literature

Mechanism for the allosteric regulation of phosphodiesterase 2A deduced from the X-ray structure of a near full-length construct.

Pandit, J.Forman, M.D.Fennell, K.F.Dillman, K.S.Menniti, F.S.

(2009) Proc Natl Acad Sci U S A 106: 18225-18230

  • DOI: https://doi.org/10.1073/pnas.0907635106
  • Primary Citation of Related Structures:  
    3IBJ, 3ITM, 3ITU

  • PubMed Abstract: 

    We report the X-ray crystal structure of a phosphodiesterase (PDE) that includes both catalytic and regulatory domains. PDE2A (215-900) crystallized as a dimer in which each subunit had an extended organization of regulatory GAF-A and GAF-B and catalytic domains connected by long alpha-helices. The subunits cross at the GAF-B/catalytic domain linker, and each side of the dimer contains in series the GAF-A and GAF-B of one subunit and the catalytic domain of the other subunit. A dimer interface extends over the entire length of the molecule. The substrate binding pocket of each catalytic domain is occluded by the H-loop. We deduced from comparisons with structures of isolated, ligand-bound catalytic subunits that the H-loop swings out to allow substrate access. However, in dimeric PDE2A (215-900), the H-loops of the two catalytic subunits pack against each other at the dimer interface, necessitating movement of the catalytic subunits to allow for H-loop movement. Comparison of the unliganded GAF-B of PDE2A (215-900) with previous structures of isolated, cGMP-bound GAF domains indicates that cGMP binding induces a significant shift in the GAF-B/catalytic domain linker. We propose that cGMP binding to GAF-B causes movement, through this linker region, of the catalytic domains, such that the H-loops no longer pack at the dimer interface and are, instead, free to swing out to allow substrate access. This increase in substrate access is proposed as the basis for PDE2A activation by cGMP and may be a general mechanism for regulation of all PDEs.


  • Organizational Affiliation

    Pfizer Global Research and Development, Groton Labs, Groton, CT 06340, USA. jayvardhan.pandit@pfizer.com


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
cGMP-dependent 3',5'-cyclic phosphodiesterase
A, B
691Homo sapiensMutation(s): 0 
Gene Names: PDE2A
EC: 3.1.4.17
UniProt & NIH Common Fund Data Resources
Find proteins for O00408 (Homo sapiens)
Explore O00408 
Go to UniProtKB:  O00408
PHAROS:  O00408
GTEx:  ENSG00000186642 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00408
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.02 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.215 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.233α = 90
b = 89.699β = 90
c = 264.187γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
BUSTER-TNTrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2009-10-27 
  • Deposition Author(s): Pandit, J.

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Data collection, Database references, Derived calculations, Refinement description