FTSH PROTEASE 3 facilitates Complex I degradation through a direct interaction with the Complex I subunit PSST.
Plant Cell
; 35(8): 3092-3108, 2023 08 02.
Article
em En
| MEDLINE
| ID: mdl-37177987
ABSTRACT
Complex I (CI) (NADH dehydrogenase), the largest complex involved in mitochondrial oxidative phosphorylation, is composed of nuclear- and mitochondrial-encoded subunits. CI assembly occurs via the sequential addition of subdomains and modules. As CI is prone to oxidative damage, its subunits continually undergo proteolysis and turnover. We describe the mechanism by which CI abundance is regulated in a CI-deficient Arabidopsis thaliana mutant. Using a forward genetic approach, we determined that the CI Q-module domain subunit PSST interacts with FTSH PROTEASE 3 (FTSH3) to mediate the disassembly of the matrix arm domain for proteolysis and turnover as a means of protein quality control. We demonstrated the direct interaction of FTSH3 with PSST and identified the amino acid residues required for this interaction. The ATPase function of FTSH3, rather than its proteolytic activity, is required for this interaction, as its mutation was compensated for by a proteolytically inactive form of FTSH3. This study reveals the mechanistic process by which FTSH3 recognizes CI for degradation at amino acid resolution.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peptídeo Hidrolases
/
Arabidopsis
Idioma:
En
Revista:
Plant Cell
Assunto da revista:
BOTANICA
Ano de publicação:
2023
Tipo de documento:
Article
País de afiliação:
Austrália