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Alternative initiation removes the mitochondrial localisation signal (MLS) motif of tRNA (guanine(26)-N(2))-dimethyltransferase, mitochondrial (TRM1), abrogating binding to Mitochondrial import receptor subunit TOM70 (TOMM70A). Both variants contain a weak nuclear localisation signal (NLS) (KKSKKKRC). However, this motif is over-powered by the MLS and therefore the full-length variant is localised to mitochondria. Alternative initiation removes the N-terminus and the MLS motif, resulting in a nuclear localisation for the truncated isoform.

(1) tRNA (guanine(26)-N(2))-dimethyltransferase, mitochondrial (TRM1)
(2) Mitochondrial import receptor subunit TOM70 (TOMM70A)


(1) Separate information required for nuclear and subnuclear localization: additional complexity in localizing an enzyme shared by mitochondria and nuclei.
Rose et al. Mol. Cell. Biol. (1992)

See also

Other switches involving participants
Mitochondrial import receptor subunit TOM70 (TOMM70A) - 7 more (view)

Other switches involving interfaces
ELM:TRG_MLS - 7 more (view)
Tetratricopeptide repeat - 8 more (view)

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