9JGL | pdb_00009jgl

Crystal Structure of 14-3-3 sigma in complex with a phosphoserine peptide from MEX3B

• PDB DOI: https://doi.org/10.2210/pdb9JGL/pdb

• Classification: PEPTIDE BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2024-09-07 Released: 2025-09-10 
• Deposition Author(s): Yang, K.L.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 
  0.237 (Depositor), 0.238 (DCC) 
• R-Value Work: 
  0.204 (Depositor), 0.204 (DCC) 
• R-Value Observed: 
  0.205 (Depositor) 

Starting Model: in silico

Literature

Crystal Structure of 14-3-3 sigma in complex with a phosphoserine peptide from MEX3B

Yang, K.L.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Biological Assembly Evidence: isothermal titration calorimetry

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Biological Assembly 3  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 4-mer - A2B1C1 

Biological assembly 3 generated by PISA (software)

Macromolecule Content 

• Total Structure Weight: 55.99 kDa 
• Atom Count: 3,952 
• Modeled Residue Count: 484 
• Deposited Residue Count: 490 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
14-3-3 protein sigma	A, B	237	Homo sapiens	Mutation(s): 0  Gene Names: SFN, HME1
UniProt & NIH Common Fund Data Resources
Find proteins for P31947 (Homo sapiens) Explore P31947  Go to UniProtKB:  P31947
PHAROS:  P31947 GTEx:  ENSG00000175793

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
MEX3B	C, D	8	Homo sapiens	Mutation(s): 0

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	C, D	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free:  0.237 (Depositor), 0.238 (DCC) 
• R-Value Work:  0.204 (Depositor), 0.204 (DCC) 
• R-Value Observed: 0.205 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.254	α = 90
b = 95.093	β = 90
c = 146.031	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
MOLREP	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-09-10 
Deposition Author(s): Yang, K.L.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	--

Revision History  

• Version 1.0: 2025-09-10
  Type: Initial release