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Introduction to Membrane Proteins

Introduction to Membrane Proteins

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 types have...

Insertion of Single-pass Transmembrane Proteins in the RER

Insertion of Single-pass Transmembrane Proteins in the RER

Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...

Insertion of Multi-pass Transmembrane Proteins in the RER

Insertion of Multi-pass Transmembrane Proteins in the RER

The rough ER membrane synthesizes, assembles, and embeds transmembrane proteins in diverse topologies. These proteins function as transporters or channels and can remain in the ER membrane or are sent to the Golgi complex, lysosome, and cell membrane.
The multipass transmembrane proteins are the type IV integral membrane proteins with multiple topogenic sequences determining their spatial arrangement in the ER membrane. Nearly all multipass proteins lack a cleavable signal sequence and use...

Protein Folding

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...

Protein Folding

Protein Folding

Protein Folding

Protein Folding

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Co-Translational Insertion of Membrane Proteins into Preformed Nanodiscs

Co-Translational Insertion of Membrane Proteins into Preformed Nanodiscs

Published on: November 19, 2020

Introduction to theme "membrane protein folding and insertion".

Gunnar von Heijne¹

¹Center for Biomembrane Research, Department of Biochemistry and Biophysics, Stockholm Unviersity, S-10691 Stockholm, Sweden. gunnar@dbb.su.se

Annual Review of Biochemistry

|June 17, 2011

Summary

This summary is machine-generated.

This volume explores membrane protein research, covering transmembrane communication, beta-barrel assembly, and bacterial inner membrane protein assembly. It highlights key developments and future directions in membrane protein biochemistry.

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Membrane proteins are crucial for cellular functions, including transport, signaling, and energy transduction.
Understanding their structure and function is essential for deciphering complex biological processes.
Recent advances have shed light on the intricate mechanisms of membrane protein assembly and function.

Discussion:

This volume features three comprehensive reviews on cutting-edge membrane protein research.
Topics include transmembrane communication, the assembly of beta-barrel membrane proteins by the Bam complex, and bacterial inner membrane protein assembly.
These reviews provide insights into general principles and specific examples from diverse membrane protein systems.

Key Insights:

Grigoryan et al. discuss transmembrane communication using M2 proton channels, K⁺ channels, and integrin receptors as models.
Hagan et al. detail the molecular machinery and mechanisms of beta-barrel membrane protein assembly mediated by the Bam complex.
Dalbey et al. focus on the assembly pathways of bacterial inner membrane proteins, highlighting key factors and challenges.

Outlook:

The field of membrane protein research is rapidly evolving, with a focus on integrating structural, functional, and biochemical data.
Future research will likely delve deeper into the dynamic nature of membrane proteins and their interactions.
Continued exploration of these areas promises to unlock new therapeutic targets and biotechnological applications.