PXD045393-1

PXD045393 is an original dataset announced via ProteomeXchange.

Title	Multiple phosphorylation sites regulate the activity of the repressor Mig1 in Candida albicans
Description	The highly conserved heterotrimeric protein kinase SNF1 is important for metabolic adaptations in the pathogenic yeast Candida albicans. A key function of SNF1 is to inactivate the repressor protein Mig1 and thereby allow the expression of genes that are required for the the utilization of alternative carbon sources when the preferred carbon source glucose is absent or becomes limiting. However, how SNF1 controls Mig1 activity in C. albicans has remained elusive. Using a phosphoproteomic approach, we found that Mig1 is phosphorylated at multiple serine residues. Replacement of these serine residues by nonphosphorylatable alanine residues strongly increased the repressor activity of Mig1 in cells lacking a functional SNF1 complex, indicating that additional protein kinases are involved in the regulation of Mig1. Unlike wild-type Mig1, whose levels strongly decreased when the cells were grown on sucrose or glycerol instead of glucose, the levels of a mutant Mig1 protein lacking nine phosphorylation sites remained high under these conditions. Despite the increased protein levels and the absence of multiple phosphorylation sites, cells with a functional SNF1 complex could still sufficiently inhibit the hyperactive Mig1 to enable wild-type growth on alternative carbon sources. In line with this, phosphorylated forms of the mutant Mig1 were still detected in the presence and absence of a functional SNF1, demonstrating that Mig1 contains additional, unidentified phosphorylation sites and that downstream protein kinases are involved in the control of Mig1 activity by SNF1.
HostingRepository	PRIDE
AnnounceDate	2023-10-28
AnnouncementXML	Submission_2023-10-27_16:06:53.732.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	ThomasKrüger
SpeciesList	scientific name: Candida albicans (Yeast); NCBI TaxID: 5476;
ModificationList	phosphorylated residue; acetylated residue; monohydroxylated residue; iodoacetamide derivatized residue
Instrument	Q Exactive HF

Revision	Datetime	Status	ChangeLog Entry
0	2023-09-14 12:35:27	ID requested
⏵ 1	2023-10-27 16:06:54	announced
2	2023-11-14 08:25:38	announced	2023-11-14: Updated project metadata.

submitter keyword: Candida albicans, Phosphoproteomics, Mig1, kinases, SNF1

Axel A.Brakhage
contact affiliation	Department for Molecular and Applied Microbiology, Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute - Leibniz-HKI, Jena, Germany
contact email	axel.brakhage@leibniz-hki.de
lab head
ThomasKrüger
contact affiliation	Leibniz Institute for Natural Product Research and Infection Biology - Hans Knöll Institute
contact email	thomas.krueger@leibniz-hki.de
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD045393
     1. Label: PRIDE project
     2. Name: Multiple phosphorylation sites regulate the activity of the repressor Mig1 in Candida albicans