Cited by 209Mitochondrial Function and PathologyCell death mechanisms and regulationATP Synthase and ATPases Research

SPG7 Is an Essential and Conserved Component of the Mitochondrial Permeability Transition Pore

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Shanmughapriya, Santhanam, Rajan, Sudarsan, Hoffman, Nicholas E., Higgins, Andrew M., Tomar, Dhanendra, Nemani, Neeharika, Hines, Kevin J., Smith, Dylan J. +14 more·2015·Molecular Cell

Abstract

Mitochondrial permeability transition is a phenomenon in which the mitochondrial permeability transition pore (PTP) abruptly opens, resulting in mitochondrial membrane potential (ΔΨm) dissipation, loss of ATP production, and cell death. Several genetic candidates have been proposed to form the PTP complex, however, the core component is unknown. We identified a necessary and conserved role for spastic paraplegia 7 (SPG7) in Ca(2+)- and ROS-induced PTP opening using RNAi-based screening. Loss of SPG7 resulted in higher mitochondrial Ca(2+) retention, similar to cyclophilin D (CypD, PPIF) knockdown with sustained ΔΨm during both Ca(2+) and ROS stress. Biochemical analyses revealed that the PTP is a heterooligomeric complex composed of VDAC, SPG7, and CypD. Silencing or disruption of SPG7-CypD binding prevented Ca(2+)- and ROS-induced ΔΨm depolarization and cell death. This study identifies an ubiquitously expressed IMM integral protein, SPG7, as a core component of the PTP at the OMM and IMM contact site.

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Crossref · 10.1016/j.molcel.2015.08.009

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  • RNAi-based screening identified SPG7 as essential component of PTPC acting as part of VDAC-containing and CYPD-containing hetero-oligomers.

    “An RNA interference (RNAi)-based screening identified SPG7, paraplegin matrix AAA peptidase subunit (SPG7) as an essential component of the PTPC acting as part of VDAC-containing and CYPD-containing hetero-oligomers [406].”

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Authors
Shanmughapriya, S., Rajan, S., Hoffman, N. E., Higgins, A. M., Tomar, D., Nemani, N., Hines, K. J., Smith, D. J., Eguchi, A., Vallem, S., Shaikh, F., Cheung, M., Leonard, N. J., Stolakis, R. S., Wolfers, M. P., Ibetti, J., Chuprun, J. K., Jog, N. R., Houser, S. R., Koch, W. J., Elrod, J. W., & Madesh, M.
Affiliations
Temple University (US)
Corresponding author
Madesh, Muniswamy
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2015-10
Volume
60
Issue
1
Pages
47-62
ISSN
1097-2765 (ISSN-L)
OpenAlex
W1895235630
Cited by
209
References
49
Citations by year
2026: 12 · 2025: 15 · 2024: 10 · 2023: 17 · 2022: 20 · 2021: 13 · 2020: 25 · 2019: 23 · 2018: 26 · 2017: 22 · 2016: 24 · 2015: 1 · 2013: 1
FWCI
10.56
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (1S10RR027327, R01GM109882, R01HL086699, R01HL119306)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
Keywords
SPG7, mitochondrial permeability transition pore, mitochondrial permeability transition, cyclophilin D, voltage-dependent anion channel, mitochondrial membrane potential, reactive oxygen species, mitochondrial depolarization, cell death, inner membrane, outer membrane, RNAi screening
MeSH terms
ATPases Associated with Diverse Cellular Activities, Peptidyl-Prolyl Isomerase D, Binding Sites, Calcium, HeLa Cells, Humans, Metalloendopeptidases, Mitochondria, Cell Death, Reactive Oxygen Species, Cyclophilins, RNA Interference, Voltage-Dependent Anion Channel 1, Mitochondrial Membranes, Membrane Potential, Mitochondrial, HEK293 Cells

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