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Phase II Reactions: Acetylation Reactions01:24

Phase II Reactions: Acetylation Reactions

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Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
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Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
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Acyltransferases that Modify Cell Surface Polymers Across the Membrane.

Bailey J Schultz1, Suzanne Walker1

  • 1Department of Microbiology, Blavatnik Institute, Harvard Medical School, Boston, Massachusetts 02115, United States.

Biochemistry
|April 2, 2025
PubMed
Summary
This summary is machine-generated.

Cell surface polymers are modified with acyl esters, but how these acyl groups cross membranes is unclear. Recent studies reveal cross-membrane acyltransferases, like MBOATs and AT3 proteins, shuttle acyl groups via intermediates to extracellular polymers.

Keywords:
AT3MBOATSGNHacetyltransferaseacyltransferasebacteriacell envelopecell surfaceenzyme mechanismglycopolymerpolysaccharidetransferase

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Cell surface polymers like oligosaccharides are frequently modified by acyl esters.
  • These acylation events impact polymer structure and molecular interactions.
  • Acyl donors are synthesized in the cytoplasm, posing a challenge for extracytoplasmic modifications.

Purpose of the Study:

  • To review recent mechanistic insights into cross-membrane acyltransferases.
  • To highlight the function and logic of membrane-bound O-acyltransferases (MBOATs) and acyltransferase-3 (AT3) proteins.
  • To identify outstanding questions and future research directions in polymer acylation.

Main Methods:

  • Review of recent mechanistic studies on acyl transfer pathways.
  • Analysis of the chemical and biosynthetic logic of key enzyme families.
  • Comparative examination of MBOAT and AT3 protein functions.

Main Results:

  • Bacterial acyl transfer pathways often utilize two covalent intermediates to modify extracellular polymers.
  • Cross-membrane acyltransferases are crucial for transferring acyl groups across membranes.
  • MBOATs and AT3 proteins represent key enzyme families involved in these processes.

Conclusions:

  • Cross-membrane acyltransferases play a vital role in polymer acylation by bridging the cytoplasmic and extracellular spaces.
  • Understanding the mechanisms of MBOATs and AT3 proteins provides insight into cellular acyl transfer strategies.
  • Further research is needed to fully elucidate the complexities of these pathways and their biological significance.