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
  • Primary Citation of Related Structures:  
    2N9X

  • 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 interaction with LC3 ...

    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

    a Beijing Nuclear Magnetic Resonance Center, College of Chemistry and Molecular Engineering, School of Life Sciences, Peking University , Beijing , China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Microtubule-associated proteins 1A/1B light chain 3BA120Homo sapiensMutation(s): 0 
Gene Names: MAP1LC3BMAP1ALC3
Find proteins for Q9GZQ8 (Homo sapiens)
Explore Q9GZQ8 
Go to UniProtKB:  Q9GZQ8
NIH Common Fund Data Resources
PHAROS:  Q9GZQ8
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
FUN14 domain-containing protein 1B17Homo sapiensMutation(s): 0 
Gene Names: FUNDC1
Find proteins for Q8IVP5 (Homo sapiens)
Explore Q8IVP5 
Go to UniProtKB:  Q8IVP5
NIH Common Fund Data Resources
PHAROS:  Q8IVP5
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2N9X Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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