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Related Concept Videos

Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Master Transcription Regulators02:23

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...
Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...

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Related Experiment Video

Updated: May 30, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
09:32

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

Mediator complex proteins are required for diverse developmental processes.

Kathryn E Hentges1

  • 1Faculty of Life Sciences, University of Manchester, Michael Smith Building, Oxford Road, Manchester M13 9PT, UK. kathryn.hentges@manchester.ac.uk

Seminars in Cell & Developmental Biology
|August 23, 2011
PubMed
Summary
This summary is machine-generated.

The Mediator complex is essential for gene regulation and development. Its specific proteins have distinct roles, impacting different developmental processes and target genes, with varied effects across species.

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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • The Mediator complex is a crucial transcriptional co-activator, bridging transcription factors and RNA polymerase II.
  • It plays a vital role in regulating most protein-coding genes.
  • Mediator complex proteins are essential for normal animal and plant development.

Purpose of the Study:

  • To investigate the distinct roles of individual Mediator complex proteins in gene regulation and development.
  • To understand how mutations in specific Mediator complex genes affect various developmental processes.
  • To explore the differential impact of Mediator complex mutations across different species.

Main Methods:

  • Analysis of phenotypes resulting from mutations in individual Mediator complex genes.
  • Examination of gene expression defects in Mediator complex mutants.
  • Comparative analysis of Mediator gene mutants in different species.

Main Results:

  • Mutations in Mediator complex genes lead to distinct developmental phenotypes, indicating specific requirements for certain Mediator proteins.
  • Mediator complex mutants exhibit broad effects across various cell types and physiological systems.
  • Gene expression analysis reveals that Mediator proteins regulate specific target genes rather than general transcription.
  • The same Mediator gene mutation can cause dissimilar phenotypes in different species.

Conclusions:

  • Individual Mediator complex proteins have specialized functions in transcriptional regulation.
  • The Mediator complex's role in development is multifaceted, with specific components influencing distinct processes.
  • Understanding Mediator complex function is key to deciphering complex gene regulation and developmental pathways.
  • Species-specific effects highlight the evolutionary adaptability of the Mediator complex.