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Seipin is a discrete homooligomer.

Derk Binns1, Sungkyung Lee, Christopher L Hilton

  • 1Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas,Texas 75390, United States.

Biochemistry
|November 11, 2010
PubMed
Summary

Seipin protein forms large, stable complexes essential for lipid droplet structure. Mutations causing congenital generalized lipodystrophy (CGL) result in unstable seipin complexes, explaining the disease phenotype.

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Area of Science:

  • Cell biology
  • Biochemistry
  • Genetics

Background:

  • Seipin is an endoplasmic reticulum transmembrane protein crucial for lipid droplet morphology.
  • Mutations in seipin cause congenital generalized lipodystrophy (CGL), a disease characterized by adipose tissue deficiency and fat accumulation in organs.

Purpose of the Study:

  • To purify and physically characterize seipin protein complexes.
  • To investigate the structural basis of seipin function and CGL pathogenesis.

Main Methods:

  • Affinity purification of yeast seipin.
  • Size exclusion chromatography and sucrose gradient ultracentrifugation (in H2O and D2O) to determine complex size and composition.
  • Negative staining electron microscopy for structural visualization.

Main Results:

  • Yeast seipin exists as a large, stable homo-oligomeric complex of approximately 500 kDa, comprising about 9 seipin subunits.
  • The disease-associated A212P mutation in humans leads to unstable, smaller seipin complexes in yeast.
  • Electron microscopy revealed a toroidal structure for the seipin complex.

Conclusions:

  • Seipin functions as a large, stable complex, likely playing a structural role in organizing lipid droplets or mediating ER-lipid droplet communication.
  • The instability of seipin complexes due to mutations like A212P provides a molecular explanation for CGL.
  • Further structural and functional studies of the seipin complex are warranted.