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Yeast Signaling

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Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...

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Related Experiment Video

Updated: Jun 24, 2026

Assay for Adhesion and Agar Invasion in S. cerevisiae

Assay for Adhesion and Agar Invasion in S. cerevisiae

Published on: November 8, 2006

A Nematode Growth Factor from Baker's Yeast.

E J Buecher, E L Hansen, T Gottfried

Journal of Nematology

|March 27, 2009

Summary

A yeast extract supports the maturation of nematodes like Caenorhabditis briggsae and parasites such as Trichinella spiralis. Ribonucleic acid (RNA) content correlates with biological activity, suggesting a role for RNA-associated proteins.

Area of Science:

Biochemistry
Parasitology
Molecular Biology

Background:

Commercially available yeast extracts can support the growth and development of various organisms.
Chemically defined media require supplementation for optimal biological activity.
Ribonucleic acid (RNA) and protein interactions are crucial for cellular functions.

Purpose of the Study:

To investigate the biological activity of yeast extract components for nematode and parasite maturation.
To identify the specific fractions within the yeast extract responsible for supporting biological activity.
To elucidate the role of ribonucleic acid (RNA) and proteins in this biological activity.

Main Methods:

Preparation of yeast extract and its fractions.
Supplementation of chemically defined media for organism maturation.

Keywords:

Axenic culture Caenorhabditis briggsae Particle formation Ribosomes

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Centrifugation to isolate active fractions.

Treatment with protamine sulfate to analyze RNA and protein components.

Main Results:

Yeast extract effectively supported the maturation of Caenorhabditis briggsae.
Fractions rich in ribonucleic acid (RNA) exhibited the highest biological activity.
A specific fraction, pelleted after high-speed centrifugation, was highly active and could replace serum for parasite maturation.
Protamine sulfate treatment inactivated fractions by reducing RNA content, but activity could be restored.

Conclusions:

Biological activity in yeast extract is strongly associated with ribonucleic acid (RNA).
The active component appears to be protein sedimented with ribosomes.
This yeast extract provides a valuable supplement or complete medium for the in vitro maturation of nematodes and parasites.