Abstract

Purified yeast phenylalanyl tRNA synthetase (PRS) can aminoacylate highly purified E. , coli tRNA M Met and E. , coli tRNA IIu, but cannot aminoacylate highly purified E. , coli tRNA 3 Gly, E. , coli tRNA His and yeast tRNA Lys. It was previously proposed that a group of nine nucleotides comprising the region adjacent to the dihydrouridine loop were directly involved in the PRS recognition site. In addition to confirming this hypothesis, we now show that a second region of the tRNA molecule, consisting of the fourth nucleotide from the 3'end, is also directly involved in the PRS recognition site. This synthetase has an absolute requirement for adenosine at this location.

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