Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 70566.22 
• Atom Count: 4798 
• Residue Count: 613 
• Unique protein chains: 2

3N5U

Crystal structure of an Rb C-terminal peptide bound to the catalytic subunit of PP1

• DOI: 10.2210/pdb3N5U/pdb

• Classification: HYDROLASE TRANSCRIPTION REGULATION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2010-05-25 Released: 2010-08-11 
• Deposition Author(s): Hirschi, A.M., Cecchini, M., Steinhardt, R.C., Dick, F.A., Rubin, S.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.261 
• R-Value Work: 0.221 

Literature

An overlapping kinase and phosphatase docking site regulates activity of the retinoblastoma protein.

Hirschi, A., Cecchini, M., Steinhardt, R.C., Schamber, M.R., Dick, F.A., Rubin, S.M.

(2010) Nat.Struct.Mol.Biol. 17: 1051-1057

• PubMed: 20694007 
• DOI: 10.1038/nsmb.1868


• PubMed Abstract: 
  

The phosphorylation state and corresponding activity of the retinoblastoma tumor suppressor protein (Rb) are modulated by a balance of kinase and phosphatase activities. Here we characterize the association of Rb with the catalytic subunit of protein phosphatase 1 (PP1c). A crystal structure identifies an enzyme docking site in the Rb C-terminal domain that is required for efficient PP1c activity toward Rb. The phosphatase docking site overlaps with the known docking site for cyclin-dependent kinase (Cdk), and PP1 competition with Cdk-cyclins for Rb binding is sufficient to retain Rb activity and block cell-cycle advancement. These results provide the first detailed molecular insights into Rb activation and establish a novel mechanism for Rb regulation in which kinase and phosphatase compete for substrate docking.

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Organizational Affiliation: 

Department of Molecular, Cell, and Developmental Biology, University of California, Santa Cruz, California, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Serine/threonine-protein phosphatase PP1-alpha catalytic subunit	A, B	300	Homo sapiens	Mutation(s): 0  Gene Names: PPP1CA (PPP1A) EC: 3.1.3.16
Find proteins for P62136 (Homo sapiens) Go to Gene View: PPP1CA Go to UniProtKB:  P62136

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Retinoblastoma-associated protein	C	13	Homo sapiens	Mutation(s): 0  Gene Names: RB1
Find proteins for P06400 (Homo sapiens) Go to Gene View: RB1 Go to UniProtKB:  P06400

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MN	A, B	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N
CL	A, B	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.2 Å
• R-Value Free: 0.261 
• R-Value Work: 0.221 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 92.946	α = 90.00
b = 92.946	β = 90.00
c = 192.381	γ = 90.00

Software Package:

Software Name	Purpose
SCALA	data scaling
PDB_EXTRACT	data extraction
PHASER	phasing
PHENIX	refinement
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-05-25 
• Released Date: 2010-08-11 
• Deposition Author(s): Hirschi, A.M., Cecchini, M., Steinhardt, R.C., Dick, F.A., Rubin, S.M.

Revision History 

• Version 1.0: 2010-08-11
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Version format compliance