Baker, Michael J., Lampe, Philipp A., Stojanovski, Diana ORCID: 0000-0002-0199-3222, Korwitz, Anne, Anand, Ruchika ORCID: 0000-0001-7337-6007, Tatsuta, Takashi and Langer, Thomas ORCID: 0000-0003-1250-1462 (2014). Stress-induced OMA1 activation and autocatalytic turnover regulate OPA1-dependent mitochondrial dynamics. Embo J., 33 (6). S. 578 - 594. HOBOKEN: WILEY. ISSN 1460-2075

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Abstract

The dynamic network of mitochondria fragments under stress allowing the segregation of damaged mitochondria and, in case of persistent damage, their selective removal by mitophagy. Mitochondrial fragmentation upon depolarisation of mitochondria is brought about by the degradation of central components of the mitochondrial fusion machinery. The OMA1 peptidase mediates the degradation of long isoforms of the dynamin-like GTPase OPA1 in the inner membrane. Here, we demonstrate that OMA1-mediated degradation of OPA1 is a general cellular stress response. OMA1 is constitutively active but displays strongly enhanced activity in response to various stress insults. We identify an amino terminal stress-sensor domain of OMA1, which is only present in homologues of higher eukaryotes and which modulates OMA1 proteolysis and activation. OMA1 activation is associated with its autocatalyic degradation, which initiates from both termini of OMA1 and results in complete OMA1 turnover. Autocatalytic proteolysis of OMA1 ensures the reversibility of the response and allows OPA1-mediated mitochondrial fusion to resume upon alleviation of stress. This differentiated stress response maintains the functional integrity of mitochondria and contributes to cell survival.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Baker, Michael J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lampe, Philipp A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stojanovski, DianaUNSPECIFIEDorcid.org/0000-0002-0199-3222UNSPECIFIED
Korwitz, AnneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Anand, RuchikaUNSPECIFIEDorcid.org/0000-0001-7337-6007UNSPECIFIED
Tatsuta, TakashiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Langer, ThomasUNSPECIFIEDorcid.org/0000-0003-1250-1462UNSPECIFIED
URN: urn:nbn:de:hbz:38-443261
DOI: 10.1002/embj.201386474
Journal or Publication Title: Embo J.
Volume: 33
Number: 6
Page Range: S. 578 - 594
Date: 2014
Publisher: WILEY
Place of Publication: HOBOKEN
ISSN: 1460-2075
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
PHYSIOLOGICAL FUNCTIONS; CRISTAE MORPHOGENESIS; OPA1; FUSION; FISSION; PROTEASE; DEGRADATION; RECRUITMENT; MORPHOLOGY; MITOFUSINSMultiple languages
Biochemistry & Molecular Biology; Cell BiologyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/44326

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