Linked Life Data

8346679

Source:http://linkedlifedata.com/resource/pubmed/id/8346679

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
1993-9-8
pubmed:abstractText
The glucose oxidase gene (god) from Aspergillus niger was expressed in Hansenula polymorpha using the methanol oxidase promoter and transcription termination region and the MF-alpha leader sequence from Saccharomyces cerevisiae to direct secretion. The expression cassette was cloned into the S. cerevisiae vector YEp13 and used to transform H. polymorpha strain A16. In the initial transformants plasmid replication was unstable, but was stabilized by a growth regime consisting of alternating cycles of selective and non-selective growth. The stabilized strain was grown to high cell density by fed-batch fermentation. Upon induction of the MOX promoter, glucose oxidase synthesis was initiated. At the end of the fermentation, the culture density was 76 g dry weight/1 and 108 IU/ml (0.5 g/1 or 0.65% dry weight) glucose oxidase was found in the culture medium; a further 86 IU/ml (0.43 g/1 or 0.56% dry weight) was recovered from the cell lysate. A plate assay was used to monitor glucose oxidase levels in individual colonies. This was then used to isolate mutants which showed abnormal regulation of god expression or which showed an altered pattern of secretion. One mutant, which showed increased production of glucose oxidase, was grown to high cell density by fed-batch fermentation (100.6 g/l) and produced 445 IU/ml(2.25 g/l or 2.2% dry weight) extracellularly and 76 IU/ml (0.38 g/l or 0.4% dry weight) intracellularly. The mutant thus not only increased total production but exported 83% of the total enzyme made compared to 55% in the parent strain.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0749-503X
pubmed:author
pubmed:issnType
Print
pubmed:volume
9
pubmed:geneSymbol
god
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
625-35
pubmed:dateRevised
2000-12-18
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Expression of the glucose oxidase gene from Aspergillus niger in Hansenula polymorpha and its use as a reporter gene to isolate regulatory mutations.
pubmed:affiliation
Department of Molecular Biology and Biotechnology, University of Sheffield, U.K.
pubmed:publicationType
Journal Article