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Related Concept Videos

Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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Regulation of Expression Occurs at Multiple Steps02:24

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Updated: Jun 13, 2025

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Predictable modulation of a spontaneous post-translational modification in living cells.

Meghan S Martin, Nomindari Bayaraa, Brittany T Fox

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    This summary is machine-generated.

    Scientists developed a new method called dialAGE to precisely control protein glycation, a process linked to aging and disease. This technique allows researchers to study glycation

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Chemical Biology

    Background:

    • Glycation is a non-enzymatic protein modification linked to aging and disease.
    • Controlling glycation site-specifically in biological systems is challenging.
    • Understanding glycation's functional role requires precise experimental control.

    Purpose of the Study:

    • To develop a chemical approach for site-specific control of protein glycation.
    • To enable the study of glycation as a functional post-translational modification.

    Main Methods:

    • Introduced a single point mutation to modulate arginine glycation susceptibility (dialAGE).
    • Utilized mass spectrometry to confirm site-specific glycation modulation in ubiquitin in vitro.
    • Validated the method in living mammalian cells.

    Main Results:

    • Demonstrated enhanced and diminished site-specific glycation of ubiquitin using dialAGE.
    • Showed that dialAGE mutations do not interfere with polyubiquitin chain formation.
    • Successfully modulated ubiquitin glycation levels within living cells.

    Conclusions:

    • The dialAGE method provides precise control over protein glycation.
    • This approach facilitates the investigation of glycation's functional roles.
    • DialAGE is a valuable tool for studying glycation in cellular and in vitro contexts.