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Nucleic Acids Research, 1995, Vol. 23, No. 1 165-169
© 1995

ENZYMOLOGY

Molecular recognition of tRNAPro by Escherichia coli proline tRNA synthetase in vitro

Hongjian Liu, Richard Peterson, Jason Kessler and Karin Musier-Forsyth*

Department of Chemistry, University of Minnesota 207 Pleasant Street S.E., Minneapolis, MN 55455, USA

*To whom correspondence should be addressed

Received September 1, 1994. Revised November 15, 1994. Accepted November 15, 1994.

In this study, we identify a subset of nucleotides that specify aminoacylation of tRNAPro by Escherichia coli proline tRNA synthetase in vitro. Twenty-two tRNAPro variants were prepared by in vitro transcription and their efficiency of aminoacylation with proline (kcat/KM) was measured. From this analysis, we conclude that recognition elements for tRNAPro aminoacylation by ProRS are located in at least three domains of the tRNA molecule. The largest decreases in the kinetic parameters for aminoacylation resulted from single substitutions at position G72 of the acceptor stem and position G36 of the anticodon. Anticodon nucleotide G35 and position A73 in the acceptor stem were also identified as major recognition elements. Moreover, bases that are believed to be important for maintaining the tertiary structure of the tRNA (GI5 and C48) a pear to be important for efficient recognition of tRNAPro by ProRS in vitro.


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