RCC1L (WBSCR16) isoforms coordinate mitochondrial ribosome assembly through their interaction with GTPases

English version

Autoři: Aurelio Reyes ^aff001; Paola Favia ^aff001; Sara Vidoni ^aff001; Vittoria Petruzzella ^aff002; Massimo Zeviani ^aff001
Působiště autorů: MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge, United Kingdom ^aff001; Dipartimento di Scienze Mediche di Base, Neuroscienze e Organi di Senso - Università degli Studi Aldo Moro, Piazza G. Cesare, Bari, Italy ^aff002
Vyšlo v časopise: RCC1L (WBSCR16) isoforms coordinate mitochondrial ribosome assembly through their interaction with GTPases. PLoS Genet 16(7): e32767. doi:10.1371/journal.pgen.1008923
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pgen.1008923

Souhrn

Mitochondrial translation defects can be due to mutations affecting mitochondrial- or nuclear-encoded components. The number of known nuclear genes involved in mitochondrial translation has significantly increased in the past years. RCC1L (WBSCR16), a putative GDP/GTP exchange factor, has recently been described to interact with the mitochondrial large ribosomal subunit. In humans, three different RCC1L isoforms have been identified that originate from alternative splicing but share the same N-terminus, RCC1L^V1, RCC1L^V2 and RCC1L^V3. All three isoforms were exclusively localized to mitochondria, interacted with its inner membrane and could associate with homopolymeric oligos to different extent. Mitochondrial immunoprecipitation experiments showed that RCC1L^V1 and RCC1L^V3 associated with the mitochondrial large and small ribosomal subunit, respectively, while no significant association was observed for RCC1L^V2. Overexpression and silencing of RCC1L^V1 or RCC1L^V3 led to mitoribosome biogenesis defects that resulted in decreased translation. Indeed, significant changes in steady-state levels and distribution on isokinetic sucrose gradients were detected not only for mitoribosome proteins but also for GTPases, (GTPBP10, ERAL1 and C4orf14), and pseudouridylation proteins, (TRUB2, RPUSD3 and RPUSD4). All in all, our data suggest that RCC1L is essential for mitochondrial function and that the coordination of at least two isoforms is essential for proper ribosomal assembly.

Klíčová slova:

Biosynthesis – Elution – Guanosine triphosphatase – HEK 293 cells – Immunoblotting – Mitochondria – Ribosomal RNA – RNA interference

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