PXD019305

PXD019305 is an original dataset announced via ProteomeXchange.

Title	Xylose Metabolism and the Effect of Oxidative Stress on Lipid and Carotenoid Production in Rhodotorula toruloides: Insights for Future Biorefinery
Description	The use of cell factories to convert sugars from lignocellulosic biomass into chemicals in which oleochemicals and food additives, such as carotenoids, play an important role is essential for the shift towards sustainable processes. Rhodotorula toruloides is a yeast that naturally metabolises a wide range of substrates, including lignocellulosic hydrolysates, and converts them into lipids and carotenoids. In this study, xylose, the main component of hemicellulose, was used as the sole substrate for R. toruloides, and a detailed physiology characterisation combined with absolute proteomics and genome-scale metabolic models was carried out to understand the regulation of lipid and carotenoid production. To improve these productions, oxidative stress was induced by hydrogen peroxide and light irradiation and further enhanced by adaptive laboratory evolution. Based on the online measurements of growth and CO2 excretion, three distinct growth phases were identified during batch cultivations. The intracellular flux estimations correlated well with the measured protein levels and demonstrated improved NADPH regeneration and phosphoketolase activity and reduced beta-oxidation, correlating with increasing lipid yields. Light irradiation conditions resulted in 70% higher carotenoid and 40% higher lipid yields. The presence of hydrogen peroxide did not affect the carotenoid yield but culminated in the highest lipid yield of 0.65 ± 0.06 g/gDCW. The adapted strain showed improved fitness and 130% higher carotenoid yield than the parental strain. This work presented a holistic view of xylose conversion into microbial oil and carotenoids by R. toruloides for further cost-effective and renewable production of these molecules.
HostingRepository	PRIDE
AnnounceDate	2020-07-29
AnnouncementXML	Submission_2020-07-29_04:20:28.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Petri-Jaan Lahtvee
SpeciesList	scientific name: Rhodotorula toruloides; NCBI TaxID: 5286;
ModificationList	No PTMs are included in the dataset
Instrument	LTQ Orbitrap

Revision	Datetime	Status	ChangeLog Entry
0	2020-05-20 04:15:59	ID requested
⏵ 1	2020-07-29 04:20:28	announced

Dataset with its publication pending

submitter keyword: Microbial oil, carotenoids, Rhodotorula toruloides, Genome-scale modelling, xylose, biorefinery, absolute proteomics

Petri-Jaan Lahtvee
contact affiliation	University of Tartu, Estonia
contact email	lahtvee@ut.ee
lab head
Petri-Jaan Lahtvee
contact affiliation	University of Tartu
contact email	lahtvee@ut.ee
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD019305
     1. Label: PRIDE project
     2. Name: Xylose Metabolism and the Effect of Oxidative Stress on Lipid and Carotenoid Production in Rhodotorula toruloides: Insights for Future Biorefinery