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Related Concept Videos

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Yeast Signaling

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 23, 2026

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
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The orientation of the Ribonucleic Acid within Yeast Ribosomes Determined Electro-Optically.

R S Morgan

    Biophysical Journal
    |May 12, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Electro-optical birefringence and ultraviolet dichroism reveal the orientation of ribonucleic acid (RNA) within 80S yeast ribosomes. The findings suggest RNA

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    Area of Science:

    • Molecular Biology
    • Biophysics

    Background:

    • 80S yeast ribosomes are crucial for protein synthesis.
    • Understanding the spatial organization of ribosomal RNA (rRNA) is key to elucidating ribosome function.

    Purpose of the Study:

    • To investigate the orientation of ribonucleic acid (RNA) within 80S yeast ribosomes using electro-optical techniques.
    • To determine the structural arrangement of RNA bases relative to the ribosome's electric axis.

    Main Methods:

    • Measurements of electro-optical birefringence in solution.
    • Measurements of ultraviolet dichroism in solution.
    • Analysis of optical properties of 80S yeast ribosomes.

    Main Results:

    • Distinct electro-optical birefringence signals were observed for 80S yeast ribosomes.
    • Ultraviolet dichroism confirmed specific light absorption properties related to RNA.
    • The results indicate a predominant parallel orientation of the RNA base planes relative to the ribosome's electric axis.

    Conclusions:

    • The study provides evidence for a defined structural organization of RNA within the 80S yeast ribosome.
    • This specific orientation of RNA may be critical for ribosomal function and stability.
    • Electro-optical methods are effective tools for probing macromolecular structure in solution.