Source:http://linkedlifedata.com/resource/pubmed/id/11390681
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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
Pt 6
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pubmed:dateCreated |
2001-6-6
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pubmed:abstractText |
The oleaginous fungus Mucor circinelloides possesses at least six isoforms of malic enzyme (EC 1.1.1.40), a key lipogenic enzyme in filamentous fungi. These isoforms were detected using a specific stain for activity after native PAGE of cell extracts. Only one isoform (isoform IV) was associated with lipid accumulation, appearing only after N-exhaustion from the medium (which is a pre-requisite for lipid accumulation) in glucose-growing cells. Isoforms I, II, V and VI were involved in anaerobic growth and only appeared under O(2)-limited conditions. Isoform III appeared to be constitutive and was formed under conditions of active (balanced) growth and is therefore thought to play a crucial role in basic metabolism. Growth on acetate increased the amount of cell lipid (from 25-27% in glucose-grown cells to 37-38% in acetate-grown cells) accumulated by M. circinelloides and this was associated with the appearance of isoform IV of malic enzyme prior to N-exhaustion in these cultures. Amino acid sequence analysis of isoforms III and IV suggests that these two malic enzymes may be encoded by a single gene and that isoform IV is formed from isoform III by post-translational modification initiated by either N-limitation (when glucose was the carbon source) or growth on acetate as the sole carbon source.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Acetates,
http://linkedlifedata.com/resource/pubmed/chemical/Culture Media,
http://linkedlifedata.com/resource/pubmed/chemical/Glucose,
http://linkedlifedata.com/resource/pubmed/chemical/Isoenzymes,
http://linkedlifedata.com/resource/pubmed/chemical/Malate Dehydrogenase,
http://linkedlifedata.com/resource/pubmed/chemical/malate dehydrogenase...,
http://linkedlifedata.com/resource/pubmed/chemical/malate...
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pubmed:status |
MEDLINE
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pubmed:month |
Jun
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pubmed:issn |
1350-0872
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
147
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
1507-15
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:11390681-Acetates,
pubmed-meshheading:11390681-Anaerobiosis,
pubmed-meshheading:11390681-Culture Media,
pubmed-meshheading:11390681-Electrophoresis, Polyacrylamide Gel,
pubmed-meshheading:11390681-Glucose,
pubmed-meshheading:11390681-Isoenzymes,
pubmed-meshheading:11390681-Lipid Metabolism,
pubmed-meshheading:11390681-Malate Dehydrogenase,
pubmed-meshheading:11390681-Mucor,
pubmed-meshheading:11390681-Sequence Analysis, Protein
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pubmed:year |
2001
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pubmed:articleTitle |
A pre-genetic study of the isoforms of malic enzyme associated with lipid accumulation in Mucor circinelloides.
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pubmed:affiliation |
Centre for Advanced Lipid Research, Department of Biological Sciences, University of Hull, Hull HU6 7RX, UK.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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