Linked Life Data

18930410

Source:http://linkedlifedata.com/resource/pubmed/id/18930410

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
12
pubmed:dateCreated
2008-12-8
pubmed:abstractText
The structures of peptide a- and b-type fragment ions were studied using synthetic peptides including a set of isomeric peptides, differing in the sequence location of an alanine residue labeled with (15)N and uniformly with (13)C. The pattern of isotope labeling of second-generation fragment ions derived via a(n) and b(n) ions (where n = 4 or 5) suggested that these intermediates existed in part as macrocyclic structures, where alternative sites of ring opening gave rise to different linear forms whose simple cleavage might give rise to the observed final products. Similar conclusions were derived from combined ion mobility/tandem MS analyses where different fragmentation patterns were observed for isomeric a- or b-type ions that display different ion mobilities. These analyses were facilitated by a new approach to the processing of ion mobility/tandem MS data, from which distinct and separate product ion spectra are derived from ions that are incompletely separated by ion mobility. Finally, an example is provided of evidence for a macrocyclic structure for b(n) ions where n = 8 or 9.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1044-0305
pubmed:author
pubmed:issnType
Print
pubmed:volume
19
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1781-7
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Studies of peptide a- and b-type fragment ions using stable isotope labeling and integrated ion mobility/tandem mass spectrometry.
pubmed:affiliation
Michael Barber Centre for Mass Spectrometry, School of Chemistry and Manchester Interdisciplinary Biocentre, University of Manchester, Manchester, United Kingdom.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't