5GMV

LC3B-FUNDC1 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural insights into the recognition of phosphorylated FUNDC1 by LC3B in mitophagy

Lv, M.Wang, C.Li, F.Peng, J.Wen, B.Gong, Q.Shi, Y.Tang, Y.

(2017) Protein Cell 8: 25-38

  • DOI: 10.1007/s13238-016-0328-8

  • PubMed Abstract: 
  • Mitophagy is an essential intracellular process that eliminates dysfunctional mitochondria and maintains cellular homeostasis. Mitophagy is regulated by the post-translational modification of mitophagy receptors. Fun14 domain-containing protein 1 (FU ...

    Mitophagy is an essential intracellular process that eliminates dysfunctional mitochondria and maintains cellular homeostasis. Mitophagy is regulated by the post-translational modification of mitophagy receptors. Fun14 domain-containing protein 1 (FUNDC1) was reported to be a new receptor for hypoxia-induced mitophagy in mammalian cells and interact with microtubule-associated protein light chain 3 beta (LC3B) through its LC3 interaction region (LIR). Moreover, the phosphorylation modification of FUNDC1 affects its binding affinity for LC3B and regulates selective mitophagy. However, the structural basis of this regulation mechanism remains unclear. Here, we present the crystal structure of LC3B in complex with a FUNDC1 LIR peptide phosphorylated at Ser17 (pS 17 ), demonstrating the key residues of LC3B for the specific recognition of the phosphorylated or dephosphorylated FUNDC1. Intriguingly, the side chain of LC3B Lys49 shifts remarkably and forms a hydrogen bond and electrostatic interaction with the phosphate group of FUNDC1 pS 17 . Alternatively, phosphorylated Tyr18 (pY 18 ) and Ser13 (pS 13 ) in FUNDC1 significantly obstruct their interaction with the hydrophobic pocket and Arg10 of LC3B, respectively. Structural observations are further validated by mutation and isothermal titration calorimetry (ITC) assays. Therefore, our structural and biochemical results reveal a working model for the specific recognition of FUNDC1 by LC3B and imply that the reversible phosphorylation modification of mitophagy receptors may be a switch for selective mitophagy.


    Organizational Affiliation

    Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China.,Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, 230027, China. tangyj@ustc.edu.cn.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Microtubule-associated proteins 1A/1B light chain 3B
B, A
125Homo sapiensMutation(s): 0 
Gene Names: MAP1LC3B (MAP1ALC3)
Find proteins for Q9GZQ8 (Homo sapiens)
Go to Gene View: MAP1LC3B
Go to UniProtKB:  Q9GZQ8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptide from FUN14 domain-containing protein 1
D, C
8Homo sapiensMutation(s): 0 
Gene Names: FUNDC1
Find proteins for Q8IVP5 (Homo sapiens)
Go to Gene View: FUNDC1
Go to UniProtKB:  Q8IVP5
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEP
Query on SEP
C, D
L-PEPTIDE LINKINGC3 H8 N O6 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 40.537α = 90.00
b = 86.850β = 110.86
c = 40.537γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
SCALAdata scaling
MOSFLMdata reduction
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2016-07-17 
  • Released Date: 2017-03-08 
  • Deposition Author(s): Lv, M., Wang, C., Li, F.

Revision History 

  • Version 1.0: 2017-03-08
    Type: Initial release