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Related Concept Videos

Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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Membrane Proteins01:30

Membrane Proteins

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Plasma membranes have integral transmembrane proteins involved in facilitated transport. These proteins are collectively referred to as transport proteins, and they function as either channels for the material or as carriers themselves. Channel proteins have hydrophilic domains exposed to the intracellular and extracellular fluids and a hydrophilic channel through their core that provides a hydrated opening for solutes to pass through the membrane layers. Passage through the channel allows...
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Self Within Cultural Contexts01:30

Self Within Cultural Contexts

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Cultural frameworks for understanding the self are often categorized into two broad orientations: individualism and collectivism. These paradigms influence how people define themselves, relate to others, and interpret their social worlds. Each orientation offers distinct perspectives on autonomy, responsibility, and the role of the individual within a community.Individualistic CulturesIn individualistic cultures like North America and Western Europe, identity is understood as autonomous and...
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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Tail-anchoring of Proteins in the ER Membrane01:45

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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
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Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
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Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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(Membrane) Protein Production in Context.

Paul E Schavemaker1, Bert Poolman1

  • 1Department of Biochemistry, University of Groningen, Groningen, The Netherlands.

Trends in Biochemical Sciences
|September 18, 2018
PubMed
Summary
This summary is machine-generated.

This study outlines future research directions for understanding protein production. Key areas include linking molecular mechanisms to cellular processes, exploring functional landscapes, tracing protein life cycles, and quantifying production numbers.

Keywords:
Sec transloconbiogenesisprotein productionprotein quality controlribosome

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biophysics

Background:

  • Significant advancements have been made in understanding the structural and mechanistic basis of protein production, particularly for membrane proteins.
  • Existing knowledge provides a foundation for exploring more complex and dynamic aspects of this essential cellular process.

Purpose of the Study:

  • To identify and propose four key future research directions for advancing the understanding of protein production.
  • To guide future investigations into the intricacies of molecular mechanisms, functional contexts, protein lifecycles, and quantitative aspects of protein synthesis.

Main Methods:

  • Conceptual analysis and future outlook based on current research.
  • Identification of critical knowledge gaps in the field of protein production.

Main Results:

  • Four primary research directions are proposed: (i) linking molecular mechanisms to higher-level cellular processes (e.g., protein copy number distribution, cell growth rate), (ii) exploring the functional landscape of protein production mechanisms (e.g., comparing membrane protein insertion), (iii) investigating the complete life history of proteins (synthesis to degradation), and (iv) quantitatively determining and calculating protein production numbers.
  • These directions aim to provide a more holistic and quantitative understanding of protein production.

Conclusions:

  • Further research is needed to fully elucidate the complexities of protein production.
  • Integrating molecular, functional, temporal, and quantitative perspectives will be crucial for future breakthroughs in understanding how cells produce proteins.