Synthesis and characterization of novel metal containing biomolecules through ion/ion reactions

2007 2007

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Abstract (summary)

Gas phase complexes between metal ions and biomolecules offer opportunities to study species that play significant roles in biological processes. Ion/ion reactions allow synthesis and study of metal containing gas phase biomolecular complexes. Experiments were predominantly performed in linear ion trap (LIT) hybrid instruments due to a superior ability to selectively isolate reagent ions of both polarities compared to conventional three dimensional (3-D) quadrupole ion traps, and the ability of the LIT to implement a variety of different ion/ion reaction procedures. During the thesis study, a variety of different metals and metal ion complexes have been examined for their reaction properties with both peptides and oligodeoxynucleotides (ODNs).

Chapters two and three focus on ion/ion reactions in a hybrid LIT to synthesize singly charged metalated peptides from ion/ion reactions of doubly charged peptide cations and singly charged metal salt anions, followed by a dissociation experiment to probe the fragmentation chemistry of these metalated ions. Chapter two emphasizes that dilithiated peptide complexes formed via ion/ion reactions fragment similarly to a complex formed directly from electrospray of a metal-peptide solution. Chapter three focuses on interactions of gold cations and sulfur in polypeptides containing cysteine and/or methionine residues but no disulfide bonds, and this study shows evidence for a gold-mediated even electron z-type cleavage mechanism from peptides with cysteine residues. The fourth chapter focuses on the products of ion/ion reactions of cationic transition metal complexes with oligodeoxynucleotide anions. Chapter four is an effort to understand contributions to ion/ion reaction chemistries from different reaction pathways during ion/ion reactions, including electron transfer (ET), proton transfer (PT), complex formation, and cation switching. Model oligonucleotides were hexadeoxyadenylate (hexa-dA) anions, and metal complexes studied include copper (II), iron (II), cobalt (II), and ruthenium (II), in complexes with neutral or charged organic ligands. These experimental results are examined using a model that seeks to predict relative contributions of electron transfer and metal transfer to the final ion/ion reaction product composition.

Indexing (details)

Analytical chemistry;
0486: Analytical chemistry
0487: Biochemistry
Identifier / keyword
Pure sciences; Biomolecules; Ion/ion reactions; Mass spectrometry; Metal; Oligonucleotides; Peptides; Proteins
Synthesis and characterization of novel metal containing biomolecules through ion/ion reactions
Hodges, Brittany D. M.
Number of pages
Publication year
Degree date
School code
DAI-B 69/09, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
McLuckey, Scott A.
Committee member
Abu-Omar, Mahdi; Cooks, R. Graham; Lytle, Fred E.
Purdue University
University location
United States -- Indiana
Source type
Dissertations & Theses
Document type
Dissertation/thesis number
ProQuest document ID
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
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