title: Characterization of OPA1 isoforms isolated from mouse tissues.
abstract: OPA1, a nuclear encoded mitochondrial protein causing autosomal dominant optic atrophy, is a key player in mitochondrial fusion and cristae morphology regulation. In the present study, we have compared the OPA1 transcription and translation products of different mouse tissues. Unlike in humans, we found only two exons (4b and 5b) to be involved in alternative splicing. The relative abundance of the resulting four different splice variants is tissue-dependent. Proteolytic cleavage by mitochondrial processing peptidase generates two long forms, isoforms 1 and 7, which lead to three short forms representing the end products after further proteolytic processing. In contrast, isoforms 5 and 8 are directly processed into their corresponding short forms. Short form 1 molecules form 184 kDa dimers, whereas all other isoforms contribute to 285 kDa complexes. Coiled-coil domains of the OPA1 protein specifically homo-associate and may be involved in the formation of these complexes. Furthermore, the region encoded by exon 5b inhibits the self-association of coiled-coil domain-I. Finally, our data pinpoint isoform 1 as the, by far, most abundant isoform in the nervous tissue. We postulate that manipulation of isoform 1 protein levels in relation to the other isoforms induces changes in the mitochondrial network in the cell and therefore, mutations affecting the level of functional isoform 1 could lead to devastating effects on retinal ganglion cells.
authors.affiliation: Department of Neurodegeneration, Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.
authors.forename: Vasudheva Reddy
authors.initials: VR
authors.lastname: Akepati
authors.forename: Eva-Christina
authors.initials: EC
authors.lastname: Müller
authors.forename: Albrecht
authors.initials: A
authors.lastname: Otto
authors.forename: Holger M
authors.initials: HM
authors.lastname: Strauss
authors.forename: Michael
authors.initials: M
authors.lastname: Portwich
authors.forename: Christiane
authors.initials: C
authors.lastname: Alexander
mesh_terms: D017398:Alternative Splicing / Q000235:genetics*; D000595:Amino Acid Sequence / Q000235:genetics; D000818:Animals; D001483:Base Sequence / Q000235:genetics; D001921:Brain / Q000378:metabolism; D005091:Exons / Q000235:genetics; D020558:GTP Phosphohydrolases / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D008928:Mitochondria / Q000235:genetics* / Q000378:metabolism / Q000648:ultrastructure; D024101:Mitochondrial Proteins / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D008969:Molecular Sequence Data; D009206:Myocardium / Q000378:metabolism; D029241:Optic Atrophy, Autosomal Dominant / Q000235:genetics* / Q000378:metabolism; D020033:Protein Isoforms / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D012165:Retinal Ganglion Cells / Q000378:metabolism / Q000473:pathology; D013347:Subcellular Fractions
chemical_list: D024101:Mitochondrial Proteins; D020033:Protein Isoforms; D020558:GTP Phosphohydrolases; C498809:Opa1 protein, mouse