6OBP

Reconstituted PP1 holoenzyme


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

SDS22 selectively recognizes and traps metal-deficient inactive PP1.

Choy, M.S.Moon, T.M.Ravindran, R.Bray, J.A.Robinson, L.C.Archuleta, T.L.Shi, W.Peti, W.Tatchell, K.Page, R.

(2019) Proc Natl Acad Sci U S A 116: 20472-20481

  • DOI: 10.1073/pnas.1908718116
  • Primary Citation of Related Structures:  
    6OBN, 6OBP, 6OBQ, 6OBR, 6OBS, 6OBU

  • PubMed Abstract: 
  • The metalloenzyme protein phosphatase 1 (PP1), which is responsible for ≥50% of all dephosphorylation reactions, is regulated by scores of regulatory proteins, including the highly conserved SDS22 protein. SDS22 has numerous diverse functions, surprisingly acting as both a PP1 inhibitor and as an activator ...

    The metalloenzyme protein phosphatase 1 (PP1), which is responsible for ≥50% of all dephosphorylation reactions, is regulated by scores of regulatory proteins, including the highly conserved SDS22 protein. SDS22 has numerous diverse functions, surprisingly acting as both a PP1 inhibitor and as an activator. Here, we integrate cellular, biophysical, and crystallographic studies to address this conundrum. We discovered that SDS22 selectively binds a unique conformation of PP1 that contains a single metal (M2) at its active site, i.e., SDS22 traps metal-deficient inactive PP1. Furthermore, we showed that SDS22 dissociation is accompanied by a second metal (M1) being loaded into PP1, as free metal cannot dissociate the complex and M1-deficient mutants remain constitutively trapped by SDS22. Together, our findings reveal that M1 metal loading and loss are essential for PP1 regulation in cells, which has broad implications for PP1 maturation, activity, and holoenzyme subunit exchange.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721; ktatch@lsuhsc.edu rebeccapage@email.arizona.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase PP1-alpha catalytic subunitA305Homo sapiensMutation(s): 0 
Gene Names: PPP1CAPPP1A
EC: 3.1.3.16
UniProt & NIH Common Fund Data Resources
Find proteins for P62136 (Homo sapiens)
Explore P62136 
Go to UniProtKB:  P62136
PHAROS:  P62136
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP62136
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein phosphatase 1 regulatory subunit 7B [auth C]310Homo sapiensMutation(s): 0 
Gene Names: PPP1R7SDS22
UniProt & NIH Common Fund Data Resources
Find proteins for Q15435 (Homo sapiens)
Explore Q15435 
Go to UniProtKB:  Q15435
PHAROS:  Q15435
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ15435
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 132.309α = 90
b = 69.703β = 90
c = 81γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-18
    Type: Initial release
  • Version 1.1: 2019-09-25
    Changes: Data collection, Database references
  • Version 1.2: 2019-10-02
    Changes: Data collection, Database references
  • Version 1.3: 2019-10-23
    Changes: Data collection, Database references
  • Version 1.4: 2019-12-18
    Changes: Author supporting evidence