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Related Experiment Videos

Regulation of CTP:phosphocholine cytidylyltransferase by amphitropism and relocalization.

R B Cornell1, I C Northwood

  • 1Dept of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada V5A 1S6. cornell@sfu.ca

Trends in Biochemical Sciences
|September 6, 2000
PubMed
Summary

Cytidine 5'-triphosphate (CTP):phosphocholine cytidylyltransferase (CCT) regulates phosphatidylcholine (PC) synthesis. Signals recruit CCT alpha from the nucleus to the endoplasmic reticulum, activating PC synthesis.

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Amphitropic proteins: regulation by reversible membrane interactions (review).

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Area of Science:

  • Cellular biology
  • Biochemistry
  • Molecular genetics

Background:

  • Phosphatidylcholine (PC) is crucial for animal cell membranes.
  • Cytidine 5'-triphosphate (CTP):phosphocholine cytidylyltransferase (CCT) is the primary enzyme regulating PC synthesis.
  • CCT is amphitropic, existing in soluble inactive and membrane-bound active forms.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of CCT in PC synthesis.
  • To investigate the role of CCT alpha localization in cellular PC homeostasis.
  • To understand how external signals modulate CCT activity and membrane association.

Main Methods:

  • Enzyme kinetics analysis.
  • Cellular fractionation and subcellular localization studies.

Related Experiment Videos

  • Analysis of membrane physical properties and their effect on CCT binding.

    • Main Results:

    • CCT's membrane-binding domain, an amphipathic alpha helix, senses and responds to PC-deficient membranes.
    • Membrane binding of CCT activates the enzyme by releasing inhibition in the catalytic domain, stimulating PC synthesis.
    • The major CCT alpha isoform, surprisingly found in the nucleus, is recruited to the endoplasmic reticulum by signals that promote PC synthesis.

    Conclusions:

    • CCT alpha's nuclear localization represents a regulatory reservoir.
    • Dynamic recruitment of CCT alpha to the endoplasmic reticulum is a key mechanism for regulating PC synthesis in response to cellular needs.
    • This mechanism ensures the maintenance of cellular membrane PC content.