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Exo84c interacts with VAP27 to regulate exocytotic compartment degradation and stigma senescence

Zhang, Tong; Li, Yifan; Li, Chengyang; Zang, Jingze; Gao, Erlin; Kroon, Johan T.; Qu, Xiaolu; Hussey, Patrick J.; Wang, Pengwei

Exo84c interacts with VAP27 to regulate exocytotic compartment degradation and stigma senescence Thumbnail


Tong Zhang

Yifan Li

Chengyang Li

Jingze Zang

Erlin Gao

Xiaolu Qu

Pengwei Wang


In plants, exocyst subunit isoforms exhibit significant functional diversity in that they are involved in either protein secretion or autophagy, both of which are essential for plant development and survival. Although the molecular basis of autophagy is widely reported, its contribution to plant reproduction is not very clear. Here, we have identified Exo84c, a higher plant-specific Exo84 isoform, as having a unique function in modulating exocytotic compartment degradation during stigmatic tissue senescence. This process is achieved through its interaction with the ER localised VAP27 proteins, which regulate the turnover of Exo84c through the autophagy pathway. VAP27 recruits Exo84c onto the ER membrane as well as numerous ER-derived autophagosomes that are labelled with ATG8. These Exo84c/exocyst and VAP27 positive structures are accumulated in the vacuole for degradation, and this process is partially perturbed in the exo84c knock-out mutants. Interestingly, the exo84c mutant showed a prolonged effective pollination period with higher seed sets, possibly because of the delayed stigmatic senescence when Exo84c regulated autophagy is blocked. In conclusion, our studies reveal a link between the exocyst complex and the ER network in regulating the degradation of exocytosis vesicles, a process that is essential for normal papilla cell senescence and flower receptivity.


Zhang, T., Li, Y., Li, C., Zang, J., Gao, E., Kroon, J. T., …Wang, P. (2023). Exo84c interacts with VAP27 to regulate exocytotic compartment degradation and stigma senescence. Nature Communications, 14(1), Article 4888.

Journal Article Type Article
Acceptance Date Aug 8, 2023
Online Publication Date Aug 14, 2023
Publication Date 2023
Deposit Date Aug 23, 2023
Publicly Available Date Aug 23, 2023
Journal Nature Communications
Publisher Nature Research
Peer Reviewed Peer Reviewed
Volume 14
Issue 1
Article Number 4888
Public URL


Published Journal Article (11.6 Mb)


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