Investigation of the role of four mitotic septins and chitin synthase 2 for cytokinesis in Kluyveromyces lactis
| Autor: | Dorthe Rippert, Jürgen J. Heinisch |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Saccharomyces cerevisiae Genes Fungal Mitosis macromolecular substances Septin Microbiology 03 medical and health sciences Kluyveromyces Genetics Spore germination Cytokinesis Kluyveromyces lactis Chitin Synthase biology fungi Genetic Complementation Test Chitin synthase biology.organism_classification Yeast Cell biology 030104 developmental biology biology.protein Gene Deletion Septins |
| Zdroj: | Fungal genetics and biology : FGB. 94 |
| ISSN: | 1096-0937 |
| Popis: | Septins are key components of the cell division machinery from yeast to humans. The model yeast Saccharomyces cerevisiae has five mitotic septins, Cdc3, Cdc10, Cdc11, Cdc12, and Shs1. Here we characterized the five orthologs from the genetically less-redundant milk yeast Kluyveromyces lactis. We found that except for KlSHS1 all septin genes are essential. Klshs1 deletions displayed temperature-sensitive growth and morphological defects. Heterologous complementation analyses revealed that all five K. lactis genes encode functional orthologs of their S. cerevisiae counterparts. Fluorophore-tagged versions of the K. lactis septins localized to a ring at the incipient bud site and split into two separate rings at the bud neck later in cytokinesis. One of the key proteins recruited to the bud neck by septins in S. cerevisiae is the chitin synthase Chs2, which synthesizes the primary septum. KlCHS2 was found to be essential and deletions showed cytokinetic defects upon spore germination. KlChs2-GFP also localized to the bud neck and to punctate structures in K. lactis. We conclude that cytokinesis in K. lactis is similar to S. cerevisiae and chimeric septin complexes are fully functional in both yeasts. In contrast to some S. cerevisiae strains, KlChs2 and KlCdc10 were found to be essential. |
| Databáze: | OpenAIRE |
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