Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435415
Title: Functional studies of serine/threonine protein kinase signalling in Mycobacterium tuberculosis
Author: Patel, Dony P.
Awarding Body: University of London
Current Institution: University College London (University of London)
Date of Award: 2006
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Abstract:
Fork-head associated (FHA) domains function in the assembly of signalling complexes through specific interactions with phospho-threonine motifs. FHA domains are found in eukaryotes, and intriguingly in a subset of bacterial species including Mycobacteria tuberculosis. In addition, the M. tuberculosis genome encodes 11 eukaryotic-like serine/threonine protein kinases (STPKs). In M. tuberculosis, the co-expression of FHA domain-containing proteins and STPKs strongly suggest that these bacterial FHA domain-containing proteins engage in phospho-dependent protein-protein interaction, and FHA dependent processes in bacteria are controlled by STPK-dependent phosphorylation. This study describes a body of biophysical and biochemical experiments which characterises the interactions between two STPKs, PknA and PknB, and three FHA domain-containing proteins, Rv0019, Rv0020 and Rv1827. Isothermal titration calorimetry and surface plasmon resonance combined with site-directed mutagenesis are used to investigate interactions of kinase domains with FHA domains. These experiments reveal that the FHA domains interact with specific phospho-threonine residues located within the kinase domain activation loop. Additionally, in vitro kinase assays demonstrated that the interactions also involve phosphorylation of the FHA domains and/or adjacent segments of the protein. These data suggest that STPK-mediated signalling in M. tuberculosis involves a complex series of interactions and suggests a 'molecular docking' model for the phosphorylation of FHA domain-containing proteins. Finally, high-throughput assays have been used to identify several inhibitors of PknB which will serve as the basis for development of novel antimicrobial therapies.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.435415  DOI: Not available
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