PXD026796

PXD026796 is an original dataset announced via ProteomeXchange.

Title	A novel SNF2 ATPase complex in Trypanosoma brucei with a role in H2A.Z-mediated chromatin remodelling
Description	A cascade of histone acetylation events with subsequent incorporation of a histone H2A variant plays an essential part in transcription regulation in various model organisms. A key player in this cascade is the chromatin remodellling complex SWR1, which replaces the canonical histone H2A with its variant H2A.Z. Transcriptional regulation of polycistronic transcription units in the unicellular parasite Trypanosoma brucei has been shown to be highly dependent on acetylation of H2A.Z, which is mediated by the histone-acetyltransferase HAT2. The chromatin remodellling complex, which mediates H2A.Z incorporation is not known and an SWR1 orthologue in trypanosomes has not yet been reported. In this study, we identified and characterised an SWR1-like remodelller complex in T. brucei that is responsible for Pol II-dependent transcriptional regulation. Bioinformatic analysis of potential SNF2 DEAD/Box helicases, the key component of SWR1 complexes, identified a 1211 amino acids-long protein that exhibits key structural characteristics of the SWR1 subfamily. Systematic protein-protein interaction analysis revealed the existence of a novel complex exhibiting key features of an SWR1-like chromatin remodelller. RNAi-mediated depletion of the ATPase subunit of this complex resulted in a significant reduction of H2A.Z incorporation at transcription start sites and a subsequent decrease of steady-state mRNA levels. Furthermore, depletion of SWR1 and RNA-polymerase II (Pol II) caused massive chromatin condensation. The potential function of several proteins associated with the SWR1-like complex and with HAT2, the key factor of H2A.Z incorporation, is discussed.
HostingRepository	PRIDE
AnnounceDate	2022-08-12
AnnouncementXML	Submission_2022-08-12_04:18:26.888.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	F Butter
SpeciesList	scientific name: Oryza sativa (Rice); NCBI TaxID: 4530; scientific name: Trypanosoma brucei; NCBI TaxID: 5691; scientific name: Rhizophagus irregularis; NCBI TaxID: 588596;
ModificationList	No PTMs are included in the dataset
Instrument	Q Exactive

Revision	Datetime	Status	ChangeLog Entry
0	2021-06-18 03:51:59	ID requested
⏵ 1	2022-08-12 04:18:27	announced

Vellmer T, Hartleb L, Fradera Sola A, Kramer S, Meyer-Natus E, Butter F, Janzen CJ, A novel SNF2 ATPase complex in Trypanosoma brucei with a role in H2A.Z-mediated chromatin remodelling. PLoS Pathog, 18(6):e1010514(2022) [pubmed]

submitter keyword: LC-MS/MS

Falk Butter
contact affiliation	IMB, Ackermannweg 4, 55128 Mainz
contact email	f.butter@imb.de
lab head
F Butter
contact affiliation	Quantitative Proteomics Institute of Molecular Biology (IMB)
contact email	f.butter@imb-mainz.de
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD026796
     1. Label: PRIDE project
     2. Name: A novel SNF2 ATPase complex in Trypanosoma brucei with a role in H2A.Z-mediated chromatin remodelling