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Phosphatidylserine decarboxylase 1 autocatalysis and function does not require a mitochondrial-specific factor.

Ouma Onguka1, Elizabeth Calzada1, Oluwaseun B Ogunbona1

  • 1From the Department of Physiology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205.

The Journal of Biological Chemistry
|April 2, 2015
PubMed
Summary

Mitochondrial phosphatidylserine decarboxylase 1 (Psd1p) is essential for cellular function. This study reveals Psd1p autocatalysis and function do not require mitochondrial-specific factors, challenging prior assumptions.

Keywords:
autocatalysismembranemembrane biogenesismitochondriaphosphatidylethanolaminephospholipidyeast

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Mitochondrial Biology

Background:

  • Phosphatidylethanolamine (PE) is a crucial cellular phospholipid synthesized via multiple pathways.
  • Mitochondrial PE synthesis, essential for functions like oxidative phosphorylation and development, relies on phosphatidylserine decarboxylase 1 (Psd1p).
  • Psd1p requires autocatalytic processing for activity, involving a conserved LGST motif, and was presumed to need mitochondrial-specific factors.

Purpose of the Study:

  • To elucidate the molecular requirements for Psd1p autocatalysis and in vivo function.
  • To investigate the necessity of specific residues within the LGST motif for Psd1p activity.
  • To determine if mitochondrial-specific factors are essential for Psd1p processing and functionality.

Main Methods:

  • Site-directed mutagenesis of the conserved LGST motif in Psd1p.
  • Analysis of Psd1p autocatalysis in vitro and in vivo.
  • Re-localization studies of Psd1p to the secretory pathway.

Main Results:

  • Only the serine residue within the LGST motif is critical for Psd1p autocatalysis and function; other residues are dispensable.
  • Psd1p autocatalysis proceeds efficiently without its substrate, phosphatidylserine.
  • Psd1p undergoes normal autocatalysis and is fully functional when targeted to the secretory pathway, negating the need for mitochondrial-specific factors.

Conclusions:

  • Psd1p autocatalysis is robust and does not depend on mitochondrial-specific phospholipids, proteins, or co-factors.
  • The essentiality of the serine residue highlights a conserved mechanism for Psd1p activation.
  • These findings redefine the understanding of Psd1p regulation and mitochondrial PE synthesis.