Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 9-mer - A4B1C1D1E1F1 Local Symmetry: Dihedral - D2  (3D View)
Local Stoichiometry: Homo 4-mer - A4 

Local Symmetry: Dihedral - D2  (3D View)
Local Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 612.84 kDa 
• Atom Count: 16613 
• Modelled Residue Count: 2183 
• Deposited Residue Count: 5525 
• Unique protein chains: 5

7K36

Cryo-EM structure of STRIPAK complex

• PDB DOI: 10.2210/pdb7K36/pdb
• EM Map EMD-22650:EMDBEMDataResource

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Baculovirus expression vector pFastBac1-HM
• Mutation(s): No 


• Deposited: 2020-09-10 Released: 2021-03-10 
• Deposition Author(s): Jeong, B.-C., Bai, X.C.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), Welch Foundation

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of the Hippo signaling integrator human STRIPAK.

Jeong, B.C., Bae, S.J., Ni, L., Zhang, X., Bai, X.C., Luo, X.

(2021) Nat Struct Mol Biol 28: 290-299

• PubMed: 33633399 
• DOI: 10.1038/s41594-021-00564-y
• Primary Citation of Related Structures:  
  7K36


• PubMed Abstract: 
  

The striatin-interacting phosphatase and kinase (STRIPAK) complex is a large, multisubunit protein phosphatase 2A (PP2A) assembly that integrates diverse cellular signals in the Hippo pathway to regulate cell proliferation and survival. The architecture and assembly mechanism of this critical complex are poorly understood. Using cryo-EM, we determine the structure of the human STRIPAK core comprising PP2AA, PP2AC, STRN3, STRIP1, and MOB4 at 3.2-Å resolution. Unlike the canonical trimeric PP2A holoenzyme, STRIPAK contains four copies of STRN3 and one copy of each the PP2AA-C heterodimer, STRIP1, and MOB4. The STRN3 coiled-coil domains form an elongated homotetrameric scaffold that links the complex together. An inositol hexakisphosphate (IP ₆ ) is identified as a structural cofactor of STRIP1. Mutations of key residues at subunit interfaces disrupt the integrity of STRIPAK, causing aberrant Hippo pathway activation. Thus, STRIPAK is established as a noncanonical PP2A complex with four copies of regulatory STRN3 for enhanced signal integration.

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Organizational Affiliation: 

Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoform	A	589	Homo sapiens	Mutation(s): 0  Gene Names: PPP2R1A
UniProt & NIH Common Fund Data Resources
Find proteins for P30153 (Homo sapiens) Explore P30153  Go to UniProtKB:  P30153
PHAROS:  P30153 GTEx:  ENSG00000105568

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Striatin-3	B, D, E, F, G	713	Homo sapiens	Mutation(s): 0  Gene Names: STRN3, GS2NA, SG2NA
UniProt & NIH Common Fund Data Resources
Find proteins for Q13033 (Homo sapiens) Explore Q13033  Go to UniProtKB:  Q13033
PHAROS:  Q13033 GTEx:  ENSG00000196792

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform	C	309	Homo sapiens	Mutation(s): 0  Gene Names: PPP2CA EC: 3.1.3.16
UniProt & NIH Common Fund Data Resources
Find proteins for P67775 (Homo sapiens) Explore P67775  Go to UniProtKB:  P67775
PHAROS:  P67775 GTEx:  ENSG00000113575

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
MOB-like protein phocein	H	225	Homo sapiens	Mutation(s): 0  Gene Names: MOB4, MOB3, MOBKL3, PHOCN, PREI3, CGI-95
UniProt & NIH Common Fund Data Resources
Find proteins for Q9Y3A3 (Homo sapiens) Explore Q9Y3A3  Go to UniProtKB:  Q9Y3A3
PHAROS:  Q9Y3A3 GTEx:  ENSG00000115540

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Striatin-interacting protein 1	I	837	Homo sapiens	Mutation(s): 0  Gene Names: STRIP1, FAM40A, KIAA1761
UniProt & NIH Common Fund Data Resources
Find proteins for Q5VSL9 (Homo sapiens) Explore Q5VSL9  Go to UniProtKB:  Q5VSL9
PHAROS:  Q5VSL9 GTEx:  ENSG00000143093

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IHP	N [auth I]	INOSITOL HEXAKISPHOSPHATE C6 H18 O24 P6 IMQLKJBTEOYOSI-GPIVLXJGSA-N
ZN	L [auth H], M [auth H]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
MN	J [auth C], K [auth C]	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.30 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2020-09-10 
• Released Date: 2021-03-10 
Deposition Author(s): Jeong, B.-C., Bai, X.C.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM132275
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	CA220283
Welch Foundation	United States	I-1932
Welch Foundation	United States	I-1944
Welch Foundation	United States	I-1702

Revision History  

• Version 1.0: 2021-03-10
  Type: Initial release
  
• Version 1.1: 2021-03-24
  Changes: Database references