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Chapter 5 : tRNA Processing Nucleases

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Abstract:

This chapter focuses on ribonucleases that are involved in generating the 3' terminus of tRNA precursors and in cleaving a tRNA from a multicomponent transcript. Much of our knowledge about tRNA-processing pathways has come from studies with and bacteriophage-infected , although there has been some examination of other bacteria as well. The major interest in is due primarily to the availability, in this system, of mutations that interfere with tRNA maturation, allowing processing intermediates to be identified and processing nucleases to be implicated in the processing pathway. However, the tRNA precursors isolated from these mutant strains have undergone partial processing. First, the tRNA portions of polycistronic precursors have been cleaved from the other RNAs with which they are co-transcribed. Second, multimeric tRNA precursors generally have been converted to monomeric or dimeric forms. A major goal in the study of any metabolic pathway is to identify the enzymes that catalyze each of its reactions, to understand their specificity and mechanism of action, and to determine whether they are subject to regulation, either directly on their activity or on their synthesis. The chapter presents a summary of the exoribonucleases and endoribonucleases implicated in tRNA processing. Given the availability of mutant strains lacking many of these enzymes, alone or in combination, it is likely that the details of a tRNA processing pathway will be forthcoming in the near future.

Citation: Deutscher M. 1995. tRNA Processing Nucleases, p 52-65. In tRNA. ASM Press, Washington, DC. doi: 10.1128/9781555818333.ch5

Key Concept Ranking

Saccharomyces cerevisiae
0.50510204
Escherichia coli
0.4370585
tRNA Maturation
0.43429533
Bacillus subtilis
0.4326879
0.50510204
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Figures

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Figure 1

Proposed processing pathway for tRNA precursor. The initial endonucleolytic cleavages indicated as step 0 are only necessary for a complex transcript to remove the tRNA portion from its co-transcribed partners. In some cases, step 0 at the 3′ end and step 1 could be identical. Likewise, at the 5′ end, step 0 may correspond to an RNase P cleavage (step 3). However, mono- meric precursors usually can be generated from complex transcripts in the absence of RNase P. The exonucleolytic trimming reactions are shown here as two steps (2 and 4) to indicate that trimming occurs before and after RNase P cleavage (step 3). The actual number of trimming reactions that take place is not known, but recent evidence suggests that, at least for (SuUAG) tRNA, steps 2 and 4 are carried out most effectively by RNase PH and RNase T, respectively, other exoribonucleases can contribute as well. The enzymes involved in steps 0 and 1 are not well defined. See text for details.

Citation: Deutscher M. 1995. tRNA Processing Nucleases, p 52-65. In tRNA. ASM Press, Washington, DC. doi: 10.1128/9781555818333.ch5
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Image of Figure 2
Figure 2

Processing pathway for the pre-tRNA specified by phage T4. A series of reactions (steps 1 to 5) are catalyzed by the enzymes RNase BN (steps 1 and 4), tRNA nucleotidyltransferase (steps 2 and 5), and RNase P (step 3). (Adapted from reference .)

Citation: Deutscher M. 1995. tRNA Processing Nucleases, p 52-65. In tRNA. ASM Press, Washington, DC. doi: 10.1128/9781555818333.ch5
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References

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Tables

Generic image for table
Table 1

exoribonucleases implicated in tRNA processing

Citation: Deutscher M. 1995. tRNA Processing Nucleases, p 52-65. In tRNA. ASM Press, Washington, DC. doi: 10.1128/9781555818333.ch5

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