The germinal centre kinase Don3 is crucial for unconventional secretion of 
chitinase Cts1 in Ustilago maydis

Aschenbroich, J; Hussnaetter, KP; Stoffels, P; Langner, T; Zander, S; Sandrock, P; Bölker, M; Feldbrügge, M; Schipper, K

doi:10.1016/j.bbapap.2018.10.007

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

The germinal centre kinase Don3 is crucial for unconventional secretion of chitinase Cts1 in Ustilago maydis

MPS-Authors

There are no MPG-Authors in the publication available

External Resource

No external resources are shared

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Aschenbroich, J., Hussnaetter, K., Stoffels, P., Langner, T., Zander, S., Sandrock, P., et al. (2019). The germinal centre kinase Don3 is crucial for unconventional secretion of chitinase Cts1 in Ustilago maydis. Biochimica et Biophysica Acta: Proteins and Proteomics, 1867(12): 140154. doi:10.1016/j.bbapap.2018.10.007.

Cite as: https://hdl.handle.net/21.11116/0000-000D-900F-0

Abstract

Unconventional secretion has emerged as an increasingly important cellular process in eukaryotic cells. The underlying translocation mechanisms are diverse and often little understood. We study unconventional secretion of chitinase Cts1 in the corn smut fungus Ustilago maydis. This protein participates in the cytokinesis of yeast cells. During budding it localizes to the septated fragmentation zone where it presumably functions in the degradation of remnant chitin to allow separation of mother and daughter cell. However, the mechanistic details of Cts1 export remain unclear. Here we investigated the mechanism of unconventional Cts1 secretion with a focus on cytokinesis. Cell-cycle inhibition experiments supported the hypothesis that Cts1 export is connected to cytokinesis. To substantiate this finding we analysed gene deletion mutants impaired in cell separation and discovered that strains defective in secondary septum formation were affected in Cts1 export. The germinal centre kinase Don3 had a particularly strong influence on unconventional secretion. Using a synthetic switch, we unambiguously verified an essential role of Don3 for cytokinesis-dependent Cts1 export via the fragmentation zone. Thus, we gained novel insights into the mechanism of unconventional secretion and discovered the first regulatory component of this process.