The Z-shaped N-terminal Domain of Atg11 Coordinates Atg9 Recruitment in Selective Autophagy

Verdict. To gain insight into this unknown aspect of autophagy initiation we utilized a combination of biochemical, structural, and cellular approaches. It intersects mitochondrial stress/dysfunction themes (disease context).

What the authors report

Macroautophagy is a conserved catabolic process that facilitates the degradation of cellular material by capturing it in double membrane vesicles termed autophagosomes. In Saccharomyces cerevisiae, selective macroautophagy is initiated by the scaffolding protein Atg11.

Key results stated in the abstract include the following. To gain insight into this unknown aspect of autophagy initiation we utilized a combination of biochemical, structural, and cellular approaches. We demonstrate that the N-terminal domain (NTD) of Atg11 is the primary interaction site for Atg9, but the NTD requires clustering by the C-terminal region of Atg11 for its complete interaction with Atg9. We investigated the structure of the Atg11-NTD using cryo-EM which, in combination with AlphaFold modeling, revealed a positively charged binding pocket within the Atg11-NTD that is essential for Atg9 binding.

Why it matters for mitochondrial biology

Within mitochondrial research, this work maps primarily to structural biology, computational. It is relevant to mitochondrial dysfunction discourse because the abstract invokes disease context. That does not by itself establish a validated disease mechanism; it indicates thematic proximity. Server: biorxiv. Posted 2026-08-19. Synthesis confidence is bounded by abstract completeness.

Study design (abstract-level)

We investigated the structure of the Atg11-NTD using cryo-EM which, in combination with AlphaFold modeling, revealed a positively charged binding pocket within the Atg11-NTD that is essential for Atg9 binding.

Principal findings

1. To gain insight into this unknown aspect of autophagy initiation we utilized a combination of biochemical, structural, and cellular approaches.
2. We demonstrate that the N-terminal domain (NTD) of Atg11 is the primary interaction site for Atg9, but the NTD requires clustering by the C-terminal region of Atg11 for its complete interaction with Atg9.
3. We investigated the structure of the Atg11-NTD using cryo-EM which, in combination with AlphaFold modeling, revealed a positively charged binding pocket within the Atg11-NTD that is essential for Atg9 binding.
4. Mutation of this conserved binding pocket leads to a loss of Atg9 binding in yeast and a reduction in the selective autophagy of mitochondria.
5. Taken together, our results demonstrate the mechanism by which Atg11 recruits Atg9 to autophagy initiation sites.

Limitations of this brief

• This Mitos brief is an abstract-level synthesis of a preprint; it is not peer review and not a substitute for reading the full paper.
• Preprint status: findings may change with revision or journal review.
• Effect sizes, n numbers, statistics, and full experimental controls are typically incomplete at abstract resolution.
• Comparator/control language is weak or absent in the abstract, limiting causal inference from this brief alone.
• Primary source: biorxiv DOI 10.64898/2026.08.17.744853 (posted 2026-08-19).

Open scientific questions

• Which specific experimental panels in the full paper establish the strongest causal claim, and how robust are the controls?
• How do these findings sit relative to prior literature on the same pathway—replication, contradiction, or incremental extension?

Bottom line

For mitochondrial biologists focused on structural biology, computational, this preprint is worth full-text review if the topic matches your program. Abstract-level takeaway: To gain insight into this unknown aspect of autophagy initiation we utilized a combination of biochemical, structural, and cellular approaches. Confirm methods, effect sizes, and controls in the full PDF before citing the result as established.

Bibliographic record

Abstract-based editorial synthesis by Mitos. Not peer review.