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Master Transcription Regulators

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

Regulation of Expression Occurs at Multiple Steps

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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.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...

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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.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...

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 addition of a...

Abnormal Proliferation

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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...

Covalently Linked Protein Regulators

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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.
These groups modify specific amino acids in a protein.

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Related Experiment Video

Updated: Jun 4, 2026

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry

Published on: May 17, 2016

Post-translational control of Myc function during differentiation.

Maralice Conacci-Sorrell¹, Robert N Eisenman

¹Division of Basic Sciences, Fred Hutchinson Cancer Research Center; Seattle, WA USA. mconacci@fhcrc.org

Cell Cycle (Georgetown, Tex.)

|February 5, 2011

Summary

This summary is machine-generated.

Myc proteins regulate cell differentiation. In muscle cells, calcium-dependent calpains cleave c-Myc, inactivating its transcriptional function and creating Myc-nick, which accelerates differentiation.

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Retroviral Transduction of Helper T Cells as a Genetic Approach to Study Mechanisms Controlling their Differentiation and Function

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Published on: November 4, 2016

Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

Myc proteins are crucial regulators of cell proliferation, metabolism, apoptosis, differentiation, and tumorigenesis.
Myc proteins can paradoxically inhibit or promote differentiation based on biological context.

Purpose of the Study:

To investigate a novel regulatory mechanism of c-Myc in differentiating muscle cells.
To elucidate the dual role of c-Myc cleavage by calpains in muscle differentiation.

Main Methods:

Proteolytic cleavage analysis of c-Myc.
Investigation of c-Myc C-terminal and N-terminal cleavage products (Myc-nick).
Assessment of Myc-nick's role in cytoskeletal architecture and muscle differentiation.

Main Results:

Identified calcium-dependent calpains as mediators of c-Myc proteolytic cleavage in the cytoplasm of differentiating muscle cells.
Demonstrated that c-Myc cleavage inactivates its transcriptional function by removing the C-terminus required for Max and DNA binding.
Showed that the N-terminal fragment, Myc-nick, alters cytoskeletal architecture and promotes accelerated muscle differentiation.

Conclusions:

Calpain-mediated cleavage of c-Myc acts as a functional switch, regulating its activity during terminal differentiation.
Myc-nick plays a significant role in cytoskeletal remodeling and facilitating muscle differentiation.
This cleavage mechanism offers new insights into Myc protein regulation and its impact on cellular processes.