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CTP:phosphoethanolamine cytidylyltransferase

B A Bladergroen¹, L M van Golde

¹Department of Veterinary Basic Sciences, Graduate School of Animal Health and Institute of Biomembranes, University of Utrecht, The Netherlands.

Biochimica Et Biophysica Acta

|November 25, 1997

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Cytidylyltransferase (ET) regulates CDP-ethanolamine synthesis and binds to the endoplasmic reticulum. Cloning and sequencing reveal similarities to related enzymes and repetitive sequences in yeast and human ET.

Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

Cytidylyltransferase (ET) is crucial for CDP-ethanolamine synthesis.
ET is primarily found in rough endoplasmic reticulum (RER) regions of hepatocytes.
The enzyme exhibits substrate specificity for phosphoethanolamine and utilizes CTP/dCTP.

Purpose of the Study:

To investigate the localization and function of ET in hepatocytes.
To characterize the substrate specificity and regulatory role of ET.
To compare the molecular structure of ET from different species.

Main Methods:

Immunogold electron microscopy for enzyme localization.
Enzyme purification from rat liver.
Gene cloning and sequence analysis of yeast and human ET.

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Main Results:

ET localizes to RER-rich areas with a bimodal distribution.
ET demonstrates high specificity for phosphoethanolamine and uses CTP/dCTP.
ET is a distinct protein from CTP:phosphocholine cytidylyltransferase (CT).
Sequence analysis revealed conserved catalytic domains and repetitive regions in yeast and human ET.

Conclusions:

ET plays a significant role in regulating the CDP-ethanolamine pathway.
Reversible binding to the ER may facilitate metabolic channeling in phosphatidylethanolamine synthesis.
ET and CT are separate enzymes, despite sequence similarities in catalytic domains.