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Inhibition of CMP-sialic acid transport by endogenous 5-methyl CMP
Shivani Ahuja1, James Cahill1, Kimberly Hartfield1
1Vollum Institute, Oregon Health & Science University, Portland, Oregon, United States of America.
Plos One
|June 3, 2021
Summary
Methylated cytidine monophosphate (m5CMP), derived from epigenetic RNA modifications, inhibits the CMP-sialic acid transporter (CST). This discovery reveals a novel physiological regulator linking epigenetics to glycosylation.
Area of Science:
- Biochemistry
- Molecular Biology
- Epigenetics
Background:
- Nucleotide-sugar transporters (NSTs) are crucial for delivering substrates for glycan synthesis within the Golgi apparatus.
- Previous structural studies elucidated substrate interactions but did not address physiological regulation of NSTs.
- Glycan diversity suggests complex regulatory mechanisms for NSTs are yet to be fully understood.
Purpose of the Study:
- To identify endogenous regulators of nucleotide-sugar transporter activity.
- To investigate the link between epigenetic modifications and glycosylation control.
- To discover novel mechanisms governing glycan biosynthesis.
Main Methods:
- Biochemical assays to test inhibition of CMP-sialic acid transporter (CST) by potential endogenous ligands.
- Analysis of cellular RNA degradation pathways to identify sources of methylated nucleotides.
- Structural and functional studies to confirm m5CMP binding and inhibition of CST.
Main Results:
- Discovery of methylated cytidine monophosphate (m5CMP) as an endogenous inhibitor of CST.
- Demonstration that m5CMP originates from the degradation of epigenetically modified RNA.
- Establishment of m5CMP as a direct physiological regulator of CST activity.
Conclusions:
- m5CMP represents a novel endogenous regulator of nucleotide-sugar transport.
- This finding links epigenetic regulation of RNA to the control of cellular glycosylation.
- The study opens new avenues for understanding glycan diversity and its regulation.
