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Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
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Lipid droplets throughout the evolutionary tree.

Peter K Lundquist1, Kiran-Kumar Shivaiah1, Roberto Espinoza-Corral1

  • 1Department of Biochemistry & Molecular Biology, Michigan State University, East Lansing, MI 48824, USA; Plant Resilience Institute, Michigan State University, East Lansing, MI, 48824, USA.

Progress in Lipid Research
|April 30, 2020
PubMed
Summary
This summary is machine-generated.

This study proposes a unified classification system for intracellular lipid droplets (LDs), found across diverse organisms. Integrating research on cytoplasmic, prokaryotic, and plastid LDs will accelerate discoveries in lipid biology.

Keywords:
Lipid dropletMembranePlastoglobuleRemodelingTriacylglycerol

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Intracellular lipid droplets (LDs) are vital for lipid storage and metabolism in diverse life forms, including animals, fungi, plants, bacteria, and archaea.
  • Despite functional and compositional diversity, LDs share fundamental molecular and ultrastructural traits, yet research remains fragmented.
  • Existing research on LDs is siloed across various classes, hindering a holistic understanding of lipid droplet biology.

Purpose of the Study:

  • To integrate fragmented research fields by surveying protein and lipid compositions, functions, and biogenesis mechanisms of LDs across the natural world.
  • To establish a consistent system of categorization and nomenclature for the diverse classes of lipid droplets.
  • To provide a comprehensive overview of lipid droplet biology, highlighting shared characteristics and unique differences.

Main Methods:

  • Literature survey and synthesis of data on protein and lipid compositions of LDs.
  • Analysis of functional roles and biogenesis mechanisms across different LD classes.
  • Comparative analysis of shared and unique features among various lipid droplet types.

Main Results:

  • Lipid droplets exhibit significant diversity in biological functions, protein, and lipid compositions, yet share common characteristics.
  • A new classification system is proposed, dividing LDs into three primary classes based on subcellular location: cytoplasmic (CYTO-LDs), prokaryotic (PRO-LDs), and plastid (PL-LDs).
  • Each class contains diverse subclasses with varying sizes, shapes, and compositions, underscoring the breadth of LD biology.

Conclusions:

  • Integrating research across different lipid droplet classes offers significant benefits to the scientific community.
  • A unified categorization and nomenclature system is essential for advancing lipid droplet research.
  • This integrated approach will accelerate discovery and innovation in understanding lipid storage and metabolism.