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Membrane Lipids01:32

Membrane Lipids

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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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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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Lipids are large molecules that are generally not water-soluble. Since most of the digestive enzymes in the human body are water-based, there are specific steps the body must take to break down lipids and make them available for use.
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Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy FCS
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RaftProt V2: understanding membrane microdomain function through lipid raft proteomes.

Ahmed Mohamed1,2, Anup D Shah1, David Chen3

  • 1The University of Queensland Diamantina Institute, Faculty of Medicine, The University of Queensland, Translational Research Institute, Brisbane, QLD 4012, Australia.

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Summary

RaftProt V2 is an updated database for mammalian lipid raft proteins, improving data annotation and analysis tools. This resource aids researchers in understanding lipid raft functions by integrating diverse proteomic datasets.

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Area of Science:

  • Cellular biology
  • Proteomics
  • Bioinformatics

Background:

  • Lipid rafts are dynamic membrane domains crucial for cellular processes.
  • Previous proteomic studies of lipid rafts are limited by contaminant protein identification.
  • The initial RaftProt database facilitated lipid raft proteome analysis.

Purpose of the Study:

  • To present RaftProt V2, an enhanced database for mammalian lipid raft-associated proteins.
  • To improve data annotation and introduce new analytical utilities for integrated proteomic studies.
  • To facilitate the identification of contaminant proteins and advance lipid raft research.

Main Methods:

  • Developed RaftProt V2 with updated datasets and UniProt/UniRef ID re-mapping.
  • Implemented stringent annotation based on experimental evidence levels.
  • Redesigned the web interface for interactive data selection, correlation analysis, and network visualization.

Main Results:

  • RaftProt V2 offers improved annotation, including experimental evidence levels for contaminant identification.
  • The database allows simultaneous multi-protein/experiment searches across cell/tissue types and gene levels.
  • New interactive features enable correlation analysis and network visualization for integrated dataset investigation.

Conclusions:

  • RaftProt V2 is a valuable, enhanced resource for the research community studying lipid rafts.
  • The database facilitates a deeper understanding of lipid raft functions through integrative proteomic data analysis.
  • Improved annotation and analytical tools in RaftProt V2 will aid in identifying true raft proteins and their roles.