Growth characteristics and metabolic flux analysis of Candida milleri

Tom Granström (Corresponding Author), Aristos Aristidou, Jouni Jokela, Matti Leisola

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)

Abstract

The growth characteristics of the sourdough yeast Candida milleri was studied in a carbon‐limited aerobic chemostat culture on defined medium. The effect of glucose, xylose, and glucose–xylose mixture on metabolite production and on key enzyme activities was evaluated. Xylose as a sole carbon source was not metabolized by C. milleri. Glucose as a sole carbon source produced only biomass and carbon dioxide. When a glucose–xylose mixture (125:125 C‐mM) was used as a carbon source, a small amount of xylose was consumed and a low concentration of xylitol was produced (7.20 C‐mM). Enzymatic assays indicated that C. milleri does not possess xylitol dehydrogenase activity and its xylose reductase is exclusively NADPH‐dependent. In glucose medium both NAD+‐ and NADP+‐dependent aldehyde dehydrogenase activities were found, whereas in a glucose–xylose medium only NADP+‐dependent aldehyde dehydrogenase activity was detected. The developed metabolic flux analysis corresponded well with the experimentally measured values of metabolite production, oxygen consumption (OUR), and carbon dioxide production (CER). Turnover number in generation and consumption of ATP, mitochondrial and cytosolic NADH, and cytosolic NADPH could be calculated and redox balance was achieved. Constraints were imposed on the flux estimates such that the directionality of irreversible reactions is not violated, and cofactor dependence of the measured enzyme activities were taken into account in constructing the metabolic flux network.

Original languageEnglish
Pages (from-to)197 - 207
Number of pages11
JournalBiotechnology and Bioengineering
Volume70
Issue number2
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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Metabolic Flux Analysis
Xylose
Candida
NADP
Aldehyde Dehydrogenase
Carbon
Enzyme activity
Fluxes
Metabolites
Glucose
Carbon Dioxide
NAD
D-Xylulose Reductase
Growth
Aldehydes
Chemostats
Xylitol
Aldehyde Reductase
Carbon dioxide
Enzyme Assays

Cite this

Granström, Tom ; Aristidou, Aristos ; Jokela, Jouni ; Leisola, Matti. / Growth characteristics and metabolic flux analysis of Candida milleri. In: Biotechnology and Bioengineering. 2000 ; Vol. 70, No. 2. pp. 197 - 207.
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Growth characteristics and metabolic flux analysis of Candida milleri. / Granström, Tom (Corresponding Author); Aristidou, Aristos; Jokela, Jouni; Leisola, Matti.

In: Biotechnology and Bioengineering, Vol. 70, No. 2, 2000, p. 197 - 207.

Research output: Contribution to journalArticleScientificpeer-review

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