2N9X
LC3 FUNDC1 complex structure
Summary for 2N9X
| Entry DOI | 10.2210/pdb2n9x/pdb |
| NMR Information | BMRB: 25919 |
| Descriptor | Microtubule-associated proteins 1A/1B light chain 3B, FUN14 domain-containing protein 1 (2 entities in total) |
| Functional Keywords | protein/peptide, lc3 interacting region (lir), protein binding-peptide complex, protein binding/peptide |
| Biological source | Homo sapiens (human) More |
| Cellular location | Cytoplasm, cytoskeleton: Q9GZQ8 Mitochondrion outer membrane ; Multi-pass membrane protein : Q8IVP5 |
| Total number of polymer chains | 2 |
| Total formula weight | 16221.31 |
| Authors | |
| Primary citation | Kuang, Y.,Ma, K.,Zhou, C.,Ding, P.,Zhu, Y.,Chen, Q.,Xia, B. Structural basis for the phosphorylation of FUNDC1 LIR as a molecular switch of mitophagy. Autophagy, 12:2363-2373, 2016 Cited by 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. 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. PubMed: 27653272DOI: 10.1080/15548627.2016.1238552 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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