3 years ago

Hydroxylation of a conserved tRNA modification establishes non-universal genetic code in echinoderm mitochondria

Hydroxylation of a conserved tRNA modification establishes non-universal genetic code in echinoderm mitochondria
Akihiko Yamagishi, Kenjyo Miyauchi, Tsutomu Suzuki, Mitsuhiro Ohara, Shin-ichi Yokobori, Asuteka Nagao, Kimitsuna Watanabe
The genetic code is not frozen but still evolving, which can result in the acquisition of 'dialectal' codons that deviate from the universal genetic code. RNA modifications in the anticodon region of tRNAs play a critical role in establishing such non-universal genetic codes. In echinoderm mitochondria, the AAA codon specifies asparagine instead of lysine. By analyzing mitochondrial (mt-) tRNALys isolated from the sea urchin (Mesocentrotus nudus), we discovered a novel modified nucleoside, hydroxy-N6-threonylcarbamoyladenosine (ht6A), 3′ adjacent to the anticodon (position 37). Biochemical analysis revealed that ht6A37 has the ability to prevent mt-tRNALys from misreading AAA as lysine, thereby indicating that hydroxylation of N6-threonylcarbamoyladenosine (t6A) contributes to the establishment of the non-universal genetic code in echinoderm mitochondria.

Publisher URL: http://dx.doi.org/10.1038/nsmb.3449

DOI: 10.1038/nsmb.3449

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