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Missing steps of mitochondrial translation initiation identified in plants

Skaltsogiannis, V.; Soufari, H.; Giege, P.

2025-12-30 molecular biology
10.64898/2025.12.30.697032 bioRxiv
Show abstract

Translation initiation, the first step of the translation cycle, involves initiation factors (mtIF) 2 and 3 in mitochondria. mtIF3 release from the ribosomal small subunit was believed to be a prerequisite for the recruitment of the initiator tRNA. Here we use cryogenic electron microscopy to characterize plant mitochondria pre-initiation complexes and to reveal how plant mtIF3 binds the initiator tRNA and facilitates its accommodation in the decoding center.

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