PXD037170-2

PXD037170 is an original dataset announced via ProteomeXchange.

Title	Elevated inorganic carbon and salinity enhances photosynthesis and ATP synthesis in picoalga Picocystis salinarum as revealed by label free quantitative proteomics
Description	Abstract Hypersaline lakes are of immense ecological value as they niche some of the most exclusive extremophilic communities dominated by bacterial and archaeal domains, with few eukaryotic algal representatives. A handful reports describe Picocystis as a key primary producer with great production rates in extremely saline habitats. An extremely haloalkaliphilic picoalgal strain, Picocystis salinarum SLJS6 isolated from hypersaline lake Sambhar, Rajasthan, India, grew robustly in an enriched soda lake medium containing mainly Na2CO3, 50 g/L; NaHCO3, 50g/L, NaCl, 50 g/L (salinity ≈150 ‰) at pH 10. To elucidate the molecular basis of such tolerance to high inorganic carbon and NaCl concentrations, a high-throughput LFQ (label-free quantitation) based quantitative proteomics approach was applied. Out of the total 383 proteins identified in treated samples, 225 were Differentially abundant proteins (DAPs), of which 150 were statistically significant (p value <0.05) including 70 upregulated and 64 downregulated proteins after 3 days of salt and alkalinity stress. Gene ontology analysis was done to annotate and classify the DAPs into functional groups. The analysis linked most DAPs to photosynthesis, oxidative phosphorylation, glucose metabolism and ribosomal structural components envisaging that photosynthesis and ATP synthesis were central to the alkalinity-salinity response. Key components of photosynthetic machinery like photosystem reaction centres, ATP synthase, Rubisco, Fructose-bisphosphate aldolase were significantly upregulated. Enzymes Peptidylprolyl isomerases (PPIase), important for correct protein folding showed remarkable marked-up regulation along with other chaperon proteins indicating their role in alleviating stress. Enhanced photosynthetic activity exhibited by Picocystis salinarum in highly saline-alkaline condition is noteworthy as photosynthesis is suppressed by salt stress in most photosynthetic organisms. This study provided the first evidence of a tailored regulatory mechanism of alkalinity and salt tolerance in extremophilic alga P. salinarum, potentially unraveling the basis of resilience in this not so known organism and paves the way for a promising future production host and model or¬ganism for deciphering the molecular mechanisms of os¬motic stress responses.
HostingRepository	PRIDE
AnnounceDate	2023-11-14
AnnouncementXML	Submission_2023-11-14_08:45:56.110.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Jyoti Singh
SpeciesList	scientific name: Picocystis salinarum; NCBI TaxID: 88271;
ModificationList	acetylated residue; monohydroxylated residue; iodoacetamide derivatized residue
Instrument	Q Exactive

Revision	Datetime	Status	ChangeLog Entry
0	2022-10-03 11:41:54	ID requested
1	2023-05-10 09:07:33	announced
⏵ 2	2023-11-14 08:46:04	announced	2023-11-14: Updated project metadata.

submitter keyword: proteomics, salinity,Picocystis salinarum, algae, bicarbonate, halophilic, label free quantitation

Dr Jyoti Singh
contact affiliation	Geobiology lab, Department of Earth Sciences, Pondicherry University, Puducherry, India
contact email	singhjyoti22@gmail.com
lab head
Jyoti Singh
contact affiliation	Department of Earth Sciences, Pondicherry University
contact email	singhjyoti22@gmail.com
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD037170
     1. Label: PRIDE project
     2. Name: Elevated inorganic carbon and salinity enhances photosynthesis and ATP synthesis in picoalga Picocystis salinarum as revealed by label free quantitative proteomics