Evidence map›Paper›PMID 22390544›Full record

ArticleJournal of the American Chemical Society2012

Enhanced epimerization of glycosylated amino acids during solid-phase peptide synthesis.

Yalong Zhang, Saddam M Muthana, David Farnsworth, Olaf Ludek, Kristie Adams, Joseph J Barchi, Jeffrey C Gildersleeve

Abstract read
In one paragraph

Article in Journal of the American Chemical Society, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers.

0numbers the graph read from it
0cells of the map it votes in
24citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

24 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Epimerisation in Peptide Synthesis.Molecules (Basel, Switzerland) · 2023
    Review
  6. Synthesis of glycopeptides and glycopeptide conjugates.Organic & biomolecular chemistry · 2022
    Review
  7. Article
  8. Article
  9. Article
  10. Article
  11. Review
  12. Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Peptide Lipidation - A Synthetic Strategy to Afford Peptide Based Therapeutics.Advances in experimental medicine and biology · 2017
    Review
  19. Advances in Fmoc solid-phase peptide synthesis.Journal of peptide science : an official publication of the European Peptide Society · 2016
    Review
  20. Chemoenzymatic synthesis of α-dystroglycan core M1 O-mannose glycans.Chemical communications (Cambridge, England) · 2015
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Yalong ZhangChemical Biology Laboratory, National Cancer Institute, 376 Boyles Street, Building 376, Frederick, Maryland 21702, USA.
Saddam M Muthana
David Farnsworth
Olaf Ludek
Kristie Adams
Joseph J Barchi
Jeffrey C Gildersleeve

Funding

Glycopeptide Antigen-bearing Nanoparticles for Passive and Active Antitumor Therapy for Pancreatic CancerZIABC010451 · NCI · DIVISION OF BASIC SCIENCES - NCI · PI BARCHI, JOSEPH JOHN · 2009 to 2025
$8.0M
Development of a Carbohydrate MicroarrayZIABC010675 · NCI · DIVISION OF BASIC SCIENCES - NCI · PI GILDERSLEEVE, JEFFREY · 2009 to 2025
$6.1M
Development of a Carbohydrate MicroarrayZ01BC010675 · NCI · DIVISION OF BASIC SCIENCES - NCI · PI GILDERSLEEVE, JEFF · 2005 to 2008
$438k
Intramural NIH HHS Z01 BC010675
6 · The paper itself

Abstract

Glycopeptides are extremely useful for basic research and clinical applications, but access to structurally defined glycopeptides is limited by the difficulties in synthesizing this class of compounds. In this study, we demonstrate that many common peptide coupling conditions used to prepare O-linked glycopeptides result in substantial amounts of epimerization at the α position. In fact, epimerization resulted in up to 80% of the non-natural epimer, indicating that it can be the major product in some reactions. Through a series of mechanistic studies, we demonstrate that the enhanced epimerization relative to nonglycosylated amino acids is due to a combination of factors, including a faster rate of epimerization, an energetic preference for the unnatural epimer over the natural epimer, and a slower overall rate of peptide coupling. In addition, we demonstrate that use of 2,4,6-trimethylpyridine (TMP) as the base in peptide couplings produces glycopeptides with high efficiency and low epimerization. The information and improved reaction conditions will facilitate the preparation of glycopeptides as therapeutic compounds and vaccine antigens.

Indexed as

Amino AcidsAntigensChromatography, High Pressure LiquidGlycopeptidesGlycosylationMagnetic Resonance SpectroscopyModels, ChemicalPeptidesSolid-Phase Synthesis TechniquesTime FactorsVaccinesAmino AcidsAntigensGlycopeptidesPeptidesVaccines

Identifiers

PMID22390544
PMCPMC3324660

What OpenQuestion holds

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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.