Evidence map›Paper›PMID 28699065›Full record

ArticleJournal of the American Society for Mass Spectrometry2017

N-Protonated Isomers and Coulombic Barriers to Dissociation of Doubly Protonated Ala

Fredrik Haeffner, Karl K Irikura

Abstract read
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In one paragraph

Article in Journal of the American Society for Mass Spectrometry, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing 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

1 citing paper in PubMed.

  1. 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

2 authors.

Fredrik HaeffnerChemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8320, USA.
Karl K IrikuraChemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8320, USA. karl.irikura@nist.gov.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Collision-induced dissociation (or tandem mass spectrometry, MS/MS) of a protonated peptide results in a spectrum of fragment ions that is useful for inferring amino acid sequence. This is now commonplace and a foundation of proteomics. The underlying chemical and physical processes are believed to be those familiar from physical organic chemistry and chemical kinetics. However, first-principles predictions remain intractable because of the conflicting necessities for high accuracy (to achieve qualitatively correct kinetics) and computational speed (to compensate for the high cost of reliable calculations on such large molecules). To make progress, shortcuts are needed. Inspired by the popular mobile proton model, we have previously proposed a simplified theoretical model in which the gas-phase fragmentation pattern of protonated peptides reflects the relative stabilities of N-protonated isomers, thus avoiding the need for transition-state information. For singly protonated Ala

Indexed as

ArginineIsomerismModels, ChemicalNitrogenPeptidesProtein ConformationProtonsTandem Mass SpectrometryArginineNitrogenPeptidesProtonsCollision-induced dissociationConformationCoulombic barrierFragmentationGas phaseHelixMass spectrometryMobile proton modelPeptidePolyalanineProton affinityQuantum chemistryTryptic

Identifiers

PMID28699065

What OpenQuestion holds

Textmetadata
Read underepoch 390

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.