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 and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 27467.18 
• Atom Count: 2177 
• 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


• 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: 1.4 Å
• R-Value Free: 0.174 
• R-Value Work: 0.148 

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:  
  4FR3, 3UX0, 3SPR, 3SP5, 3SMO, 3SMN, 3SMM, 3SML, 3SMK, 3P1S, 3P1R, 3P1Q, 3P1P, 3P1O


• 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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
14-3-3 protein sigma	A	235	Homo sapiens	Mutation(s): 0  Gene Names: SFN (HME1)
Find proteins for P31947 (Homo sapiens) Go to Gene View: SFN Go to UniProtKB:  P31947

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
6-mer peptide from Potassium channel subfamily K member 9	P	6	Homo sapiens	Mutation(s): 0  Gene Names: KCNK9 (TASK3)
Find proteins for Q9NPC2 (Homo sapiens) Go to Gene View: KCNK9 Go to UniProtKB:  Q9NPC2

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	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	P	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.4 Å
• R-Value Free: 0.174 
• R-Value Work: 0.148 
• Space Group: C 2 2 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 82.220	α = 90.00
b = 112.050	β = 90.00
c = 62.510	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
PRO	data collection
PHASER	phasing
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
  Type: Database references