Distinct Stress Response to Mitochondrial Inter-membrane Space and Matrix Proteotoxic Stress are Preferentially Modulated by TOM complex and Vms1, respectively

ABSTRACT: Double-membrane-bound architecture of mitochondria is essential for its ATP synthesis function; simultaneously such structure sub-divides the organelle into inter-membrane space (IMS) and matrix. IMS and matrix are inherently different in protein folding milieu due to their contrasting oxido-reductive environments and distinctly different protein quality control (PQC) machineries. By inducing proteotoxic stress limited to IMS or matrix using varied stressor proteins, we decipher distinct cellular response to IMS and matrix stress. IMS stress leads to specific upregulation of IMS-resident chaperones and TOM complex components. In contrast, matrix stress leads to specific upregulation of matrix- chaperones and cytosolic PQC components. We report that cells respond to mitochondrial stress by an adaptive mechanism by adjourning mitochondrial respiration while upregulating glycolysis as a compensatory pathway. By systematic genetic interaction, we show that TOM complex components act as specific modulators of IMS-stress response while Vms1 preferentially modulates the matrix stress response

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Saccharomyces Cerevisiae (baker's Yeast)

SUBMITTER: Swasti Raychaudhuri  

LAB HEAD: Swasti Raychaudhuri

PROVIDER: PXD027216 | Pride | 2024-07-09

REPOSITORIES: Pride