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Expanding our knowledge of protein tyrosine phosphatase-like phytases : mechanism, substrate specificity and pathways of myo-inositol hexakisphosphate dephosphorylation

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dc.contributor.advisor Selinger, Brent
dc.contributor.author Puhl, Aaron A.
dc.contributor.author University of Lethbridge. Faculty of Arts and Science
dc.date.accessioned 2007-11-26T22:19:58Z
dc.date.available 2007-11-26T22:19:58Z
dc.date.issued 2006
dc.identifier.uri http://hdl.handle.net/10133/526
dc.description x, 138 leaves ; 29 cm. en
dc.description.abstract 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. en
dc.language.iso en_US en
dc.publisher Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2006 en
dc.relation.ispartofseries Thesis (University of Lethbridge. Faculty of Arts and Science) en
dc.subject Dissertations, Academic en
dc.subject Phytases en
dc.subject Protein-tyrosine kinase en
dc.subject Phosphorylation en
dc.title Expanding our knowledge of protein tyrosine phosphatase-like phytases : mechanism, substrate specificity and pathways of myo-inositol hexakisphosphate dephosphorylation en
dc.type Thesis en
dc.publisher.faculty Faculty of Arts and Science en
dc.publisher.department Department of Biological Sciences en

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