Studies of human embryonic haemoglobins

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dc.contributor.advisor Brittain, T. en
dc.contributor.author Hofmann, Oliver en
dc.date.accessioned 2007-07-13T08:19:20Z en
dc.date.available 2007-07-13T08:19:20Z en
dc.date.issued 1995 en
dc.identifier THESIS 96-023 en
dc.identifier.citation Thesis (PhD--Biochemistry)--University of Auckland, 1995 en
dc.identifier.uri http://hdl.handle.net/2292/963 en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract In this study, the three human embryonic haemoglobins Gower I (ζ2ε2), Gower II (α2ε2) and Portland (ζ2γ2) have been investigated. Due to ethical and practical problems in obtaining these proteins from natural sources, a plasmid based yeast expression system has been used to express large quantities of each protein. Optimal growth conditions for the expression of the three embryonic proteins, involving a three step growth protocol, have been developed. Agitation of the cells with glass beads, followed by a three step purification protocol, yielded essentially pure haemoglobins. Physicochemical characterization showed them to be in the "native" state. Extensive growth of the cultures leads to the formation of an abnormal form of haemoglobin. This form sulphaemoglobin is produced within the cell and its occurrence could be shown to be time dependent. Further investigations indicated that the production of this abnormal form only starts some time after induction of the culture. Sulphaemoglobin free samples of each of the three human embryonic haemoglobins have then been used to investigate their function employing equilibrium and kinetic methods. Oxygen-binding studies showed, that under what are usually considered physiological conditions, each of the embryonic haemoglobins showed a high oxygen affinity, coupled to a high degree of co-operativity. It was also found, that the degree of co-operativity was unchanged under all conditions used in equilibrium studies. en
dc.language.iso en en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA9960945214002091 en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Studies of human embryonic haemoglobins en
dc.type Thesis en
thesis.degree.discipline Biochemistry en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Doctoral en
thesis.degree.name PhD en
dc.rights.holder Copyright: The author en


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