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“Identifying the SLC25A46 interactome in transgenic mice: cerebrum”

ABSTRACT: SLC25A46 is an outer mitochondrial protein, member of the mitochondrial carrier family (SLC25), whereas mutations result in mitochondrial structure abnormalities leading to a wide spectrum of neurological disorders. SLC25A46 is known to interact with members of the MICOS (Mitochondrial Contact Site) complex involved in mitochondrial cristae organization, and components of the endoplasmic reticulum membrane. In the present work, our aim was to identify the interactome of SLC25A46 in cerebrum from TgSLC25A46-FLAG transgenic mice through immunoprecipitation with anti-FLAG beads and proteomic analysis with LC-MS/MS.

INSTRUMENT(S): Q Exactive HF-X

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Telencephalon

SUBMITTER: Martina Samiotaki

LAB HEAD: Eleni Douni

PROVIDER: PXD028421 | Pride | 2022-01-11

REPOSITORIES: Pride

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“Identifying the SLC25A46 interactome in transgenic mice: Thymus"

Project description:SLC25A46 is an outer mitochondrial protein, member of the mitochondrial carrier family (SLC25), whereas mutations result in mitochondrial structure abnormalities leading to a wide spectrum of neurological disorders. SLC25A46 is known to interact with members of the MICOS (Mitochondrial Contact Site) complex involved in mitochondrial cristae organization, and components of the endoplasmic reticulum membrane. In the present work, our aim was to identify the interactome of SLC25A46 in cerebrum, cerebellum, heart and thymus from TgSLC25A46-FLAG transgenic mice through immunoprecipitation with anti-FLAG beads and proteomic analysis with LC-MS/MS.

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Mitochondrial cristae architecture protects against mtDNA release and inflammation

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2022-10-28 | GSE216499 | GEO

Diverged Trypanosome MICOS as a Hub for Mitochondrial Cristae Shaping and Protein Import

Project description:The mitochondrial contact site and cristae organization system (MICOS) is a complex responsible for proper cristae formation. Empirical data about this ubiquitous complex is limited to opisthokont models (e.g. yeast), impeding understanding of its core properties and adaptation potential to diverse cellular milieus. To close this knowledge gap, we characterized MICOS from the diverged excavate Trypanosoma brucei. These results allow the definition of fundamental MICOS properties, such as its role in maintaining both cristae and contacts between the inner and outer membranes plus its extrusion into the intermembrane space. Yet, surprising differences with opisthokonts indicate that MICOS can assume different forms. T. brucei MICOS contains a novel subunit involved in the import of intermembrane space proteins, including respiratory chain complex assembly factors. We propose an evidence-based hypothesis that T. brucei MICOS populates cristae membranes with proteins needed for respiration, supported by the complex's even distribution in cristae

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MICOS and F1FO-ATP synthase crosstalk is a fundamental property of mitochondrial cristae

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Integrative Genomics Positions MKRN1 as a Novel Ribonucleoprotein within the Embryonic Stem Cell Gene Regulatory Network

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RCCD1 also Resides in Mitochondria to Regulate mtDNA Dynamics and Mitochondrial Homeostasis

Project description:Regulator of chromosome condensation domain-containing protein 1 (RCCD1) plays an important role in chromosome segregation and microtubule stability in the nucleus and has been identified recently as a potential driver for breast cancer. We report here that, unexpectedly, RCCD1 is also localized in mitochondria. We show that RCCD1 resides in the mitochondrial inner membrane, where it interacts with the mitochondrial contact site/cristae organizing system (MICOS) and mitochondrial DNA (mtDNA) to regulate mitochondrial nucleoid organization, thereby influencing mtDNA transcription, oxidative phosphorylation, and the production of reactive oxygen species. Interestingly, RCCD1 is upregulated under hypoxic conditions, leading to decreased generation of reactive oxygen species and alleviated apoptosis favoring cancer cell survival. We show that RCCD1 promotes breast cancer cell proliferation in vitro and accelerates breast tumor growth in vivo. Indeed, RCCD1 is overexpressed in breast carcinomas, and its level of expression is associated with aggressive breast cancer phenotypes and poor patient survival. Our study reveals an additional dimension in RCCD1 functionality, indicating RCCD1 is an essential regulator of mtDNA dynamics and mitochondrial homeostasis, whose dysregulation inflicts pathologic states such as breast cancer.

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