Logan, Richard Thomas (2013). The structure and function of the vasopressin V\(_1\)\(_a\) receptor. University of Birmingham. Ph.D.
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Logan13PhD.pdf
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Abstract
The neurohypophysial hormone [arginine\(^8\)]vasopressin (AVP) exerts the majority of its physiological roles through the G-protein-coupled receptor, V\(_1\)\(_a\) R. AVP binding to the V\(_1\)\(_a\) R promotes receptor activation and generates signalling though the inositol phosphate pathway.
ICL 2 has been implicated in many aspects of GPCR signalling and crystallographic data highlight the structurally dynamic nature of this region. A complete alanine-scanning study of ICL 2 has not previously been conducted in a GPCR but is presented here in the prototypical peptide-ligand GPCR, V\(_1\)\(_a\) R. However, a role of Leu\(^3\)\(^.\)\(^5\)\(^8\) in mediating G-protein-dependent signalling was observed in the V\(_1\)\(_a\) R – a finding that has previously been reported in other GPCRs.
Upon agonist binding, the structural rearrangements of TM V and TM VI are integral in signal transduction in GPCRs. Two highly conserved residues, Tyr\(^5\)\(^.\)\(^5\)\(^8\) and Ile\(^6\)\(^.\)\(^4\)\(^0\) are key players in the activation process. Given their high conservation, it was presumed that their roles are universal throughout the rhodopsin-like GPCR family. The systematic substitution of these two residues in the V\(_1\)\(_a\) R demonstrate the receptor-specific nature of substitutions of Tyr\(^5\)\(^.\)\(^5\)\(^8\) and Ile\(^6\)\(^.\)\(^4\)\(^0\) given that findings in the V\(_1\)\(_a\) R are not recapitulated in the generally limited mutagenic studies in other receptors.
Type of Work: | Thesis (Doctorates > Ph.D.) | ||||||
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Award Type: | Doctorates > Ph.D. | ||||||
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College/Faculty: | Colleges (2008 onwards) > College of Life & Environmental Sciences | ||||||
School or Department: | School of Biosciences | ||||||
Funders: | Biotechnology and Biological Sciences Research Council | ||||||
Subjects: | Q Science > QH Natural history > QH301 Biology | ||||||
URI: | http://etheses.bham.ac.uk/id/eprint/4019 |
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