Nutrient regulates Tor1 nuclear localization and association with rDNA promoter

Article Abstract:

The nuclear localization of Tor1, or its dynamic distribution in the cytoplasm and nucleus in yeast, is shown to be nutrient dependent, whereby starvation or treatment with rapamycin causes Tor1 to exit from the nucleus. Tor1 nuclear localization is crucial for 35S rRNA synthesis and cell growth, where Tor1 is associated with 35S ribosomal DNA (rDNA) promoter chromatin in a rapamycin- and starvation-sensitive manner, thus using distinct mechanisms in the control of diverse gene expression.

Chromatin, Gene expression, Ribosomal RNA

---

Dynein arms are oscillating force generators

Article Abstract:

The rhymic beating of eukaryotic flagella is powered by the protein dynein, single molecules of which may generate oscillations. A new study investigates whether oscillation requires a complete axoneme, a complicated structure at the core of the flagellum. Optical trapping nanometry is used to measure the force generated by dynein arms. It is suggested that a single dynein arm can generate oscillation.

Eukaryotic cells, Cells (Biology), Eukaryotes, Microorganisms, Cell motility

---

Cytoplasmic dynein functions as a gear in response to load

Article Abstract:

An optical trap is used to quantify motion of polystyrene beads driven along microtubules by single cytoplasmic dynein motors. Under no load, dynein moves predominantly with a mixture of 24-nm and 32-nm steps.

Similar abstracts:

• Abstracts: Multiple rounds of speciation associated with reciprocal gene loss in polyploid yeasts. Engineering evolution to study speciation in yeasts
• Abstracts: Negative regulation of T-cell adhesion and activation by CD43. Selective imprinting of gut-homing T cells by Peyer's patch dendritic cells
• Abstracts: Policing stabilizes construction of social niches in primates. Monkeys reject unequal pay
• Abstracts: Direct integration of Hox and segmentation gene inputs during Drosophila development
• Abstracts: Suppression of c-ras transformation by GTPase-activating protein. Survival pathways meet their end

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.