Matrices of paired substitutions show the effects of tRNA D/T loop sequence on Drosophila RNase P and 3'-tRNase processing.

The Journal of Biological Chemistry
Louis LevingerA Mohan

Abstract

Drosophila RNase P and 3'-tRNase endonucleolytically process the 5' and 3' ends of tRNA precursors. We examined the processing kinetics of normal substrates and the inhibitory effect of the tRNA product on both processing reactions. The product is not a good RNase P inhibitor, with a KI approximately 7 times greater than the substrate KM of approximately 200 nM and is a better inhibitor of 3'-tRNase, with a KI approximately two times the KM of approximately 80 nM. We generated matrices of substitutions at positions G18/U55 and G19/C56 (two contiguous universally conserved D/T loop base pairs) in Drosophila tRNAHis precursors. More than half the variants display a significant reduction in their ability to be processed by RNase P and 3'-tRNase. Minimal substrates with deleted D and anticodon stems could be processed by RNase P and 3'-tRNase much like full-length substrates, indicating that D/T loop contacts and D arm/enzyme contacts are not required by either enzyme. Selected tRNAs that were poor substrates for one or both enzymes were further analyzed using Michaelis-Menten kinetics and by structure probing. Processing reductions arise principally due to an increase in KM with relatively little change in Vmax, consistent with th...Continue Reading

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Citations

Jun 17, 1999·FEMS Microbiology Reviews·A Schön
Mar 17, 2007·Nature Reviews. Microbiology·Yulia RedkoCiarán Condon
Apr 9, 2009·The Journal of Biological Chemistry·Louis LevingerChristopher Wilson
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