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J. Biol. Chem., Vol. 269, Issue 52, 32937-32941, 12, 1994

Characterization of a novel N-terminal peptide in human aspartyl-tRNA synthetase. Roles in the transfer of aminoacyl-tRNA from aminoacyl-tRNA synthetase to the elongation factor 1 alpha

VS Reed and DC Yang
Department of Chemistry, Georgetown University, Washington, District of Columbia 20057.

The kinetics of the N-terminal 32 residue-deleted human aspartyl-tRNA synthetase (hDRS delta 32) was analyzed. The kinetics of aspartyl- adenylate formation and Asp-tRNA synthesis by hDRS delta 32 were indistinguishable from those of hDRS. However, the dissociation of Asp- tRNA from hDRS delta 32 was much faster than that of hDRS. Unlike hDRS delta 32-catalyzed aspartylation of tRNA was not affected by the elongation factor 1 alpha. Two N-terminal peptides of hDRS, hDRS(T5- E26) and hDRS(D12-R27), were synthesized. Both peptides bind to tRNA- Sepharose. Both peptides, hDRS(T5-E26) and hDRS(D12-R27), are monomeric and oligomerize at high peptide concentration or in 50% propylene glycol. The peptide hDRS(T5-E26) showed little alpha-helical content as analyzed by CD spectroscopy, while hDRS(D12-R27) showed appreciable alpha-helical contents in nonpolar solvents. These results suggest that the N terminus in hDRS may mediate the slow release of Asp-tRNA and facilitate the interaction of the hDRS.Asp-tRNA complex with the elongation factor 1 alpha. The demonstration of alpha-helix formation of the hDRS N-terminal peptide is consistent with the hypothetical amphiphilic helix of the N-terminal extension in hDRS. A model for the transfer of Asp-tRNA from hDRS to elongation factor 1 alpha is presented.
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