Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 27.47 kDa 
• Atom Count: 2587 
• Modelled Residue Count: 241 
• Deposited Residue Count: 241 
• Unique protein chains: 2

3P1N

Crystal structure of human 14-3-3 sigma in complex with TASK-3 peptide

• DOI: 10.2210/pdb3P1N/pdb

• Classification: PEPTIDE BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-09-30 Released: 2011-10-12 
• Deposition Author(s): Anders, C., Higuchi, Y., Schumacher, B., Thiel, P., Kato, N., Ottmann, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.174 
• R-Value Work: 0.148 
• R-Value Observed: 0.149 

Literature

A semisynthetic fusicoccane stabilizes a protein-protein interaction and enhances the expression of K+ channels at the cell surface

Anders, C., Higuchi, Y., Koschinsky, K., Bartel, M., Schumacher, B., Thiel, P., Nitta, H., Preisig-Muller, R., Schlichthorl, G., Renigunta, V., Ohkanda, J., Daut, J., Kato, N., Ottmann, C.

(2013) Chem Biol 20: 583-593

• PubMed: 23601647 
• DOI: 10.1016/j.chembiol.2013.03.015
• Primary Citation of Related Structures:  
  3UX0, 3SMK, 3SML, 3SMM, 3SMN, 3SMO, 3P1N, 3P1O, 3P1P, 3P1Q


• PubMed Abstract: 
  

Small-molecule stabilization of protein-protein interactions is an emerging field in chemical biology. We show how fusicoccanes, originally identified as fungal toxins acting on plants, promote the interaction of 14-3-3 proteins with the human potassium channel TASK-3 and present a semisynthetic fusicoccane derivative (FC-THF) that targets the 14-3-3 recognition motif (mode 3) in TASK-3. In the presence of FC-THF, the binding of 14-3-3 proteins to TASK-3 was increased 19-fold and protein crystallography provided the atomic details of the effects of FC-THF on this interaction. We also tested the functional effects of FC-THF on TASK channels heterologously expressed in Xenopus oocytes. Incubation with 10 μM FC-THF was found to promote the transport of TASK channels to the cell membrane, leading to a significantly higher density of channels at the surface membrane and increased potassium current.

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Organizational Affiliation: 

Chemical Genomics Centre of the Max-Planck-Society, 44227 Dortmund, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
14-3-3 protein sigma	A	235	Homo sapiens	Mutation(s): 0  Gene Names: SFN, HME1
Find proteins for P31947 (Homo sapiens) Explore P31947  Go to UniProtKB:  P31947
NIH Common Fund Data Resources
PHAROS:  P31947 GTEx:  ENSG00000175793

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
6-mer peptide from Potassium channel subfamily K member 9	B [auth P]	6	N/A	Mutation(s): 0
Find proteins for Q9NPC2 (Homo sapiens) Explore Q9NPC2  Go to UniProtKB:  Q9NPC2
NIH Common Fund Data Resources
PHAROS:  Q9NPC2 GTEx:  ENSG00000169427

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CL	D [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	C [auth A], E [auth A], F [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSO	A	L-PEPTIDE LINKING	C3 H7 N O3 S		CYS
SEP	B [auth P]	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.174 
• R-Value Work: 0.148 
• R-Value Observed: 0.149 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 82.22	α = 90
b = 112.05	β = 90
c = 62.51	γ = 90

Software Package:

Software Name	Purpose
PRO	data collection
PHASER	phasing
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-09-30 
• Released Date: 2011-10-12 
Deposition Author(s): Anders, C., Higuchi, Y., Schumacher, B., Thiel, P., Kato, N., Ottmann, C.

Revision History  

• Version 1.0: 2011-10-12
  Type: Initial release
  
• Version 1.1: 2017-06-07
  Changes: Database references