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Article: Transition metal ions: Charge carriers that mediate the electron capture dissociation pathways of peptides

TitleTransition metal ions: Charge carriers that mediate the electron capture dissociation pathways of peptides
Authors
KeywordsTransition metal ions
Fragmentation
Electronic configuration
Electron capture dissociation
Peptides
Issue Date2011
Citation
Journal of the American Society for Mass Spectrometry, 2011, v. 22, n. 12, p. 2232-2245 How to Cite?
AbstractElectron capture dissociation (ECD) of model peptides adducted with first row divalent transition metal ions, including Mn 2+, Fe 2+, Co 2+, Ni 2+, Cu 2+, and Zn 2+, were investigated. Model peptides with general sequence of ZGGGXGGGZ were used as probes to unveil the ECD mechanism of metalated peptides, where X is either V or W; and Z is either R or N. Peptides metalated with different divalent transition metal ions were found to generate different ECD tandem mass spectra. ECD spectra of peptides metalated by Mn 2+ and Zn 2+ were similar to those generated by ECD of peptides adducted with alkaline earth metal ions. Series of c-/z-type fragment ions with and without metal ions were observed. ECD of Fe 2+, Co 2+, and Ni 2+ adducted peptides yielded abundant metalateda-/y-type fragment ions; whereas ECD of Cu 2+ adducted peptides generated predominantly metalated b-/y-type fragment ions. From the present experimental results, it was postulated that electronic configuration of metal ions is an important factor in determining the ECD behavior of the metalated peptides. Due presumably to the stability of the electronic configuration, metal ions with fully-filled (i.e., Zn 2+) and half filled (i.e., Mn 2+) d-orbitals might not capture the incoming electron. Dissociation of the metal ions adducted peptides would proceed through the usual ECD channel(s) via "hot-hydrogen" or "superbase" intermediates, to form series of c-/z-fragments. For other transition metal ions studied, reduction of the metal ions might occur preferentially. The energy liberated by the metal ion reduction would provide enough internal energy to generate the "slow-heating" type of fragment ions, i.e., metalated a-/yfragments and metalated b-/y-fragments. © American Society for Mass Spectrometry, 2011.
Persistent Identifierhttp://hdl.handle.net/10722/206210
ISSN
2015 Impact Factor: 3.031
2015 SCImago Journal Rankings: 1.322
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, Xiangfeng-
dc.contributor.authorFung, Yi Man Eva-
dc.contributor.authorChan, Wai Yi Kelly-
dc.contributor.authorWong, Puishuen-
dc.contributor.authorYeung, Hoisze-
dc.contributor.authorChan, Tak Wah Dominic-
dc.date.accessioned2014-10-22T01:25:27Z-
dc.date.available2014-10-22T01:25:27Z-
dc.date.issued2011-
dc.identifier.citationJournal of the American Society for Mass Spectrometry, 2011, v. 22, n. 12, p. 2232-2245-
dc.identifier.issn1044-0305-
dc.identifier.urihttp://hdl.handle.net/10722/206210-
dc.description.abstractElectron capture dissociation (ECD) of model peptides adducted with first row divalent transition metal ions, including Mn 2+, Fe 2+, Co 2+, Ni 2+, Cu 2+, and Zn 2+, were investigated. Model peptides with general sequence of ZGGGXGGGZ were used as probes to unveil the ECD mechanism of metalated peptides, where X is either V or W; and Z is either R or N. Peptides metalated with different divalent transition metal ions were found to generate different ECD tandem mass spectra. ECD spectra of peptides metalated by Mn 2+ and Zn 2+ were similar to those generated by ECD of peptides adducted with alkaline earth metal ions. Series of c-/z-type fragment ions with and without metal ions were observed. ECD of Fe 2+, Co 2+, and Ni 2+ adducted peptides yielded abundant metalateda-/y-type fragment ions; whereas ECD of Cu 2+ adducted peptides generated predominantly metalated b-/y-type fragment ions. From the present experimental results, it was postulated that electronic configuration of metal ions is an important factor in determining the ECD behavior of the metalated peptides. Due presumably to the stability of the electronic configuration, metal ions with fully-filled (i.e., Zn 2+) and half filled (i.e., Mn 2+) d-orbitals might not capture the incoming electron. Dissociation of the metal ions adducted peptides would proceed through the usual ECD channel(s) via "hot-hydrogen" or "superbase" intermediates, to form series of c-/z-fragments. For other transition metal ions studied, reduction of the metal ions might occur preferentially. The energy liberated by the metal ion reduction would provide enough internal energy to generate the "slow-heating" type of fragment ions, i.e., metalated a-/yfragments and metalated b-/y-fragments. © American Society for Mass Spectrometry, 2011.-
dc.languageeng-
dc.relation.ispartofJournal of the American Society for Mass Spectrometry-
dc.rightsThe original publication is available at www.springerlink.com-
dc.subjectTransition metal ions-
dc.subjectFragmentation-
dc.subjectElectronic configuration-
dc.subjectElectron capture dissociation-
dc.subjectPeptides-
dc.subject.meshAmino Acid Sequence-
dc.subject.meshElectrons-
dc.subject.meshMass Spectrometry - methods-
dc.subject.meshPeptides - chemistry-
dc.subject.meshTransition Elements - chemistry-
dc.titleTransition metal ions: Charge carriers that mediate the electron capture dissociation pathways of peptides-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s13361-011-0246-1-
dc.identifier.pmid21952786-
dc.identifier.scopuseid_2-s2.0-84862957469-
dc.identifier.hkuros232445-
dc.identifier.volume22-
dc.identifier.issue12-
dc.identifier.spage2232-
dc.identifier.epage2245-
dc.identifier.eissn1879-1123-
dc.identifier.isiWOS:000300360400015-

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