Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo
Thesis (Ph.D.)--Memorial University of Newfoundland, 2007. Biochemistry Includes bibliographical references (leaves 158-177) The yolk granule is the most abundant membrane-bound organelle present in sea urchin eggs and embryos. The major protein component of this organelle, major yolk protein/toposo...
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ftmemorialunivdc:oai:collections.mun.ca:theses4/102644 2023-05-15T17:23:33+02:00 Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo Hayley, Michael, 1980- Memorial University of Newfoundland. Dept. of Biochemistry 2007 xviii, 176 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses4/id/102644 Eng eng Electronic Theses and Dissertations (17.80 MB) -- http://collections.mun.ca/PDFs/theses/Hayley_Michael.pdf a2562091 http://collections.mun.ca/cdm/ref/collection/theses4/id/102644 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Sea urchins--Eggs Sea urchins--Embryos Text 2007 ftmemorialunivdc 2015-08-06T19:22:11Z Thesis (Ph.D.)--Memorial University of Newfoundland, 2007. Biochemistry Includes bibliographical references (leaves 158-177) The yolk granule is the most abundant membrane-bound organelle present in sea urchin eggs and embryos. The major protein component of this organelle, major yolk protein/toposome, accounts for approximately 50% of the total yolk protein and has also been shown to be localized to the embryonic cell surface. Biochemical and cell biological analysis in several laboratories have defined a role for toposome in mediating membrane-membrane interactions. -- In this study we have examined calcium-toposome interaction. Increasing concentrations of calcium resulted in an increase in alpha helical content from 3.0 to 22.0%, which occurred with an apparent dissociation constant (calcium) of 25 μM. In parallel experiments, toposome binding to liposomes required similar concentrations of calcium; an apparent dissociation constant (calcium) of 25 μM was recorded. Endogenous tryptophan fluorescence measurements, both in the presence and absence of liposomes, demonstrated that toposome tertiary structure Text Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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English |
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Sea urchins--Eggs Sea urchins--Embryos |
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Sea urchins--Eggs Sea urchins--Embryos Hayley, Michael, 1980- Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo |
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Sea urchins--Eggs Sea urchins--Embryos |
description |
Thesis (Ph.D.)--Memorial University of Newfoundland, 2007. Biochemistry Includes bibliographical references (leaves 158-177) The yolk granule is the most abundant membrane-bound organelle present in sea urchin eggs and embryos. The major protein component of this organelle, major yolk protein/toposome, accounts for approximately 50% of the total yolk protein and has also been shown to be localized to the embryonic cell surface. Biochemical and cell biological analysis in several laboratories have defined a role for toposome in mediating membrane-membrane interactions. -- In this study we have examined calcium-toposome interaction. Increasing concentrations of calcium resulted in an increase in alpha helical content from 3.0 to 22.0%, which occurred with an apparent dissociation constant (calcium) of 25 μM. In parallel experiments, toposome binding to liposomes required similar concentrations of calcium; an apparent dissociation constant (calcium) of 25 μM was recorded. Endogenous tryptophan fluorescence measurements, both in the presence and absence of liposomes, demonstrated that toposome tertiary structure |
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Memorial University of Newfoundland. Dept. of Biochemistry |
format |
Text |
author |
Hayley, Michael, 1980- |
author_facet |
Hayley, Michael, 1980- |
author_sort |
Hayley, Michael, 1980- |
title |
Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo |
title_short |
Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo |
title_full |
Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo |
title_fullStr |
Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo |
title_full_unstemmed |
Biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo |
title_sort |
biochemical analysis of toposome, a protein mediating membrane-membrane interactions in the sea urchin egg & embryo |
publishDate |
2007 |
url |
http://collections.mun.ca/cdm/ref/collection/theses4/id/102644 |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (17.80 MB) -- http://collections.mun.ca/PDFs/theses/Hayley_Michael.pdf a2562091 http://collections.mun.ca/cdm/ref/collection/theses4/id/102644 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
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