Copy of author's previously published work inserted. / Includes bibliographical references (leaves 160-182). / xi, 182 leaves, [57] leaves of plates : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Concentrates mainly on the characterisation of the molecular mechanism of action of the tec protein tyrosine kinase using biochemical and genetic approaches. / Thesis (Ph.D.)--University of Adelaide, Dept. of Molecular Biosciences, 2001?

"Research conducted at the Department of Haematology, Hanson Centre for Cancer Research, Institute of Medical and Veterinary Science."--T.p. / Includes bibliographical references (leaves 170-214). / xiv, 221 leaves : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Elevated levels of receptor tyrosine kinases have been implicated in carcinogenesis. It is possible that high expression of c-Kit by the leukaemic cell provides them with a growth advantage over their normal counterparts in the bone marrow microenvironment. Thus, a means of inhibiting the interaction of c-Kit on these cells with ligand Steel Factor may remove proliferation and survival signals. Main aim of the study was to produce a biological inhibitor of this interaction and evaluate its ability to prevent ligand Steel Factor from binding to c-Kit on live cells. / Thesis (Ph.D.)--University of Adelaide, Dept. of Molecular Biosciences, 2001

Thesis (M. Phil.)--University of Hong Kong, 2001. / Includes bibliographical references (leaves 130-170).

published_or_final_version / Medicine / Doctoral / Doctor of Philosophy

published_or_final_version / Zoology / Master / Master of Philosophy

No description available.

The structure and mechanism of the Protein Tyrosine Phosphatase-like Phytases (PTPLPs) from Selenomonas ruminantium (PhyAsr) and Mitsuokella multacida (PhyAmm) were investigated using a combination of enzyme kinetics, site-directed mutagenesis, and X-ray crystallography. I show that PTPLPs use a classical protein tyrosine phosphatase catalytic mechanism and adopt a core PTP fold. Several unique structural features of PTPLPs confer specificity for inositol phosphates. The effect of ionic strength and oxidation on the kinetics and structure of PTPLPs was investigated. The structural consequences of reversible and irreversible oxidation on PTPLPs and PTPs are compared and discussed. We determine the structural basis of substrate specificity in PTPLPs and propose a novel reaction mechanism for the hydrolysis of inositol polyphosphates by PTPLPs. Finally, the structure and function of a unique tandemly repeated phytase has been determined. We show that the active sites of the tandem repeat possess significantly different specificities for inositol polyphosphate. / xix, 148 leaves : ill. (some col.) ; 29 cm

A novel bacterial protein tyrosine phosphatase (PTP)-like enzyme has recently been isolated that has a PTP-like active site and fold and the ability to dephosphorylate myo-inositol hexakisphosphate. In order to expand our knowledge of this novel class of enzyme, four new representative genes were cloned from 3 different anaerobic bacteria related to clostridia and the recombinant gene products were examined. A combination of site-directed mutagenesis, kinetic, and high-performance ion-pair chromatography studies were used to elucidate the mechanism of hydrolysis, substrate specificity, and pathways of Ins P6 dephosphorylation. The data indicate that these enzymes follow a classical PTP mechanism of hydrolysis and have a general specificity for polyphosphorylated myo-inositol substrates. These enzymes dephosphorylate Ins P6 in a distributive manner, and have the most highly ordered pathways of sequential dephosphorylation of InsP6 characterized to date. Bioinformatic analyses have indicated homologues that are involved in the regulation of cellular function. / x, 138 leaves ; 29 cm.

No description available.

Thesis (Ph. D.)--University of Hawaii at Manoa, 1995. / Includes bibliographical references (leaves 115-129). / Microfiche. / ix, 129 leaves, bound ill. 29 cm