|dc.contributor.author||Mudd, Gemma Elizabeth||en
|dc.description.abstract||Chemical biology can be defined as the area of science where chemical tools are used to
study biological systems. The simplest way this can be achieved is in the identification of
compounds which inhibit or modulate a biological pathway and the consequences studied.
However, novel tools are required to enable, for example, the development of assays to allow
simpler screening of difficult targets such as membrane proteins and protein-protein
A series of kisspeptin analogues were synthesised for the development of a screening
platform compatible with G-protein coupled receptors and tagged one bead one compound
(OBOC) combinatorial libraries. Fluorescently labelled kisspeptin showed good affinity for
GPCR54 and an on-bead version of the peptide, with the required C-terminal amide
presented away from the bead was prepared and used for testing possible screening methods.
GPCR54 was expressed in a number of formats and a kisspeptin based OBOC library
designed and synthesised. Investigation into the C-terminal RF-amide motif of Kisspeptin
was also carried out in order to assess the importance of the carbonyl moiety. The
corresponding peptide amine was synthesised and the compound biologically assessed. This
led to the development of a novel acid labile benzofuranone (ALBA) linker for anchoring
amines to a solid support.
For the preparation of fluorescent kisspeptin ligands, a novel general synthetic route which
gives direct access to single isomer functionalised rhodamine dyes from phthalides has been
developed. This circumvents the arduous task of isomer separation usually associated with
the synthesis of functionalised rhodamines. The route has been demonstrated with a range of
linkage groups and rhodamine types.
This rhodamine material was used as a reporter group in various multifunctional reagents
synthesised using a trifunctional orthogonally protected backbone (TOBa), which was
prepared on a solid support and enables rapid synthesis of trifunctional reagents. This resin
takes advantage of protecting group orthogonality and the high yields of peptide bond
formation. A series of trifunctional reagents for screening use were prepared using this resin.
A proof of concept study was carried out involving the simultaneous labelling and
immobilisation of a protein for applications in probing protein-protein interactions.
Development of a trifunctional hydroxamic acid containing cross-linker was carried out
which takes advantage of its reaction with boronic acids to enable reversible capture on solid
support for enrichment of cross-linked peptides. A new benzophenone based
heterobifunctional reagent was prepared for protein cross-linking and mass spectrometry
analysis. This was shown to give complimentary reactivity to existing cross-linkers, allowing
more structural information to be extracted from protein samples.||en
|dc.contributor.sponsor||Biotechnology and Biological Sciences Research Council (BBSRC)||en
|dc.publisher||The University of Edinburgh||en
|dc.relation.hasversion||M. Hintersteiner, J. Kallen, M. Schmied, C. Graf, T. Jung, G. Mudd, S. Shave, H. Gstach, M. Auer, Angew. Chem., Int. Ed. 2014, 53, 4322.||en
|dc.relation.hasversion||M. Hintersteiner, A. J. Knox, G. Mudd, M. Auer, J. Chem. Biol 2012, 5, 63||en
|dc.relation.hasversion||“A General Synthetic Route to Isomerically Pure Functionalised Rhodamine Dyes”, Mudd, G.; Auer, M. Patent application No. 1413685.7, Aug 2014.||en
|dc.subject||solid phase synthesis||en
|dc.title||Dyes, linkers, tags and libraries – new tools for systems chemical biology||en
|dc.type||Thesis or Dissertation||en
|dc.type.qualificationname||PhD Doctor of Philosophy||en