The FtsH proteases, also called AAA proteases, are membrane-bound ATP-dependent metalloproteases. The Arabidopsis genome contains a total of 12 FtsH-like genes. Two of them, AtFtsH4 and AtFtsH11, encode proteins with a high similarity to Yme1p, a subunit of the i-AAA complex in yeast mitochondria. Phylogenetic analysis groups the AtFtsH4, AtFtsH11 and Yme1 proteins together, with AtFtsH4 being the most similar to Yme1. Using immunological method we demonstrate here that AtFtsH4 is an exclusively mitochondrial protein while AtFtsH11 is found in both chloroplasts and mitochondria. AtFtsH4 and AtFtsH11 proteases are integral parts of the inner mitochondrial membrane and expose their catalytic sites towards the intermembrane space, same as yeast i-AAA. Database searches revealed that orthologs of AtFtsH4 and AtFtsH11 are present in both monocotyledonous and dicotyledonous plants. The two plant i-AAA proteases differ significantly in their termini: the FtsH4 proteins have a characteristic alanine stretch at the C-terminal end while FtsH11s have long N-terminal extensions. Blue-native gel electrophoresis revealed that AtFtsH4 and AtFtsH11 form at least two complexes with apparent molecular masses of about 1500 kDa. This finding implies that plants, in contrast to fungi and metazoa, have more than one complex with a topology similar to that of yeast i-AAA.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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