2N9X

LC3 FUNDC1 complex structure


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the phosphorylation of FUNDC1 LIR as a molecular switch of mitophagy.

Kuang, Y.Ma, K.Zhou, C.Ding, P.Zhu, Y.Chen, Q.Xia, B.

(2016) Autophagy 12: 2363-2373

  • DOI: 10.1080/15548627.2016.1238552

  • PubMed Abstract: 
  • Mitophagy is a fundamental process that determines mitochondrial quality and homeostasis. Several mitophagy receptors, including the newly identified FUNDC1, mediate selective removal of damaged or superfluous mitochondria through their specific inte ...

    Mitophagy is a fundamental process that determines mitochondrial quality and homeostasis. Several mitophagy receptors, including the newly identified FUNDC1, mediate selective removal of damaged or superfluous mitochondria through their specific interaction with LC3. However, the precise mechanism by which this interaction is regulated to initiate mitophagy is not understood. Here, we report the solution structure of LC3 in complex with a peptide containing the FUNDC1 LC3-interacting region (LIR) motif. The structure reveals a noncanonical LC3-LIR binding conformation, in which the third LIR residue (Val20) is also inserted into the hydrophobic pocket of LC3, together with the conserved residues Tyr18 and Leu21. This enables Tyr18 to be positioned near Asp19 of LC3, and thus phosphorylation of Tyr18 significantly weakens the binding affinity due to electrostatic repulsion. Functional analysis revealed that mitochondrial targeting of the LIR-containing cytosolic portion of FUNDC1 is necessary and sufficient to initiate mitophagy when Tyr18 is unphosphorylated, even in the absence of mitochondrial fragmentation. Thus, we demonstrated that phosphorylation of Tyr18 of FUNDC1 serves as a molecular switch for mitophagy. This may represent a novel target for therapeutic intervention.


    Organizational Affiliation

    b State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Protein Science, College of Life Sciences, Nankai University , Tianjin , China.,a Beijing Nuclear Magnetic Resonance Center, College of Chemistry and Molecular Engineering, School of Life Sciences, Peking University , Beijing , China.,c State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences , Beijing , China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Microtubule-associated proteins 1A/1B light chain 3B
A
120Homo 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
FUN14 domain-containing protein 1
B
17Homo sapiensMutation(s): 0 
Gene Names: FUNDC1
Find proteins for Q8IVP5 (Homo sapiens)
Go to Gene View: FUNDC1
Go to UniProtKB:  Q8IVP5
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2015-12-14 
  • Released Date: 2016-12-14 
  • Deposition Author(s): Xia, B., Kuang, Y.

Revision History 

  • Version 1.0: 2016-12-14
    Type: Initial release
  • Version 1.1: 2017-06-07
    Type: Database references