Studies on T4‐tRNA biosynthesis: Accumulation of precursor tRNA molecules in a temperature sensitive mutant of <i>Escherichia coli</i>

Sakano, Hitoshi; Shimura, Yoichi; Ozeki, Haruo

doi:10.1016/0014-5793(74)80252-8

Cited by 14 publications

(4 citation statements)

References 10 publications

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“…Thus, it is likely that the products of the mutant extract are in monomeric forms. An essentially similar situation was encountered with spot 7 (Fig. 5b) and other multimeric precursors shown in Fig.…”

Section: Resultssupporting

confidence: 75%

“…We have shown that these molecules accumulate in TS241 as the direct result of RNase P block (refs. 7 and 8 and H. Sakano and Y. Shimura, manuscript in preparation).…”

Section: Resultsmentioning

confidence: 98%

“…As reported previously (6), the synthesis of cellular and phage-encoded tRNAs is impaired in TS241, if the cells are grown at high temperature, and characteristic tRNA precursors accumulate. The T4 tRNA precursors, including a dimeric precursor for proline and serine tRNAs and two monomeric precursors for glycine tRNA and for E tRNA (a tRNA of unknown specificity), were thus identified in mutant cells infected with phage T4 (7). We have shown that these molecules accumulate in TS241 as the direct result of RNase P block (refs.…”

Section: Resultsmentioning

confidence: 98%

“…In the case of Su3+ suppressor tRNA, an unmodified precursor RNA carrying additional nucleotides at both the 5' and 3' termini has been detected (2,3), and an endonuclease that cleaves this precursor at the 5' end of Su3+ tRNA has been identified in Escherichia coli extract and designated RNase P (4). Temperature-sensitive mutants of E. coli defective in this nucleolytic activity have been reported (5)(6)(7). So far, this is the only nuclease that has been clearly shown to participate in the trimming process of E. colh.…”

mentioning

confidence: 99%

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Sequential processing of precursor tRNA molecules in Escherichia coli.

Sakano¹,

Shimura²

1975

Proc. Natl. Acad. Sci. U.S.A.

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In a temperature-sensitive mutant of E. cofl defective in tRNA biosynthesis, many tRNA precursors, including monomeric and multimeric forms, accumulate. Some of the multimeric precursors contain three or more tRNA seuences within a molecule. These large precursors were cleaved by cell extracts first into intermediate size pieces which were subsequently processed by RNase P. On the basis of heat stability of mutant cell extracts, the endonuclease responsible for the initial cleavage appears to be distinct from RNase P and is designated RNase 0. One of the monomeric precursors was shown to be processed first by RNase P and the product subsequently cleaved further into a smaller molecule. The nuclease responsible for this second cleavage also appears to be distinct rom RNase P and is designated RNase Q. The functions of these nucleases are sequential in the trimming process with respect to that of RNase P; RNase 0 works prior to RNase P and RNase Q after RNase P but in both cases, not vice versa. The notion that tRNAs are formed from the initial transcripts of tRNA genes via a series of processing steps has been well accepted (1). These initial precursors are expected to be larger than mature tRNA size. Thus, the precursor molecules must be cleaved at specific sites in the maturation process. In the case of Su3+ suppressor tRNA, an unmodified precursor RNA carrying additional nucleotides at both the 5' and 3' termini has been detected (2, 3), and an endonuclease that cleaves this precursor at the 5' end of Su3+ tRNA has been identified in Escherichia coli extract and designated RNase P (4). Temperature-sensitive mutants of E. coli defective in this nucleolytic activity have been reported (5-7). So far, this is the only nuclease that has been clearly shown to participate in the trimming process of E. colh. It is anticipated, however, that some other nucleases are also required in maturation of tRNA molecules. Although a few other candidates have been suggested (1), none of them has been as firmly established as RNase P. Thus it remains to be solved how many nucleolytic enzymes participate in the processing of E. coli tRNAs and how they work during the trimming process. In the present paper we report that there are at least two other nucleases in E. coil that are required for tRNA biosynthesis. Evidence will be presented showing that these two nucleases and RNase P function in a highly ordered fashion on the precursors of E. coli tRNA molecules. MATERIALS AND METHODSBacterial Strains. E. coli 4273 (su, lacam, T6amr, BF23amr) and TS241, a temperature-sensitive mutant of 4273, defective in tRNA biosynthesis were described previously (6). E. colh Q13 (RNase I-) was originally from Dr. R. F. Gesteland.Preparation of RNA and Polyacrylamide Gel Electrophoresis. Low phosphate medium used for 32p labeling and extraction of RNA were described earlier (6). Electrophoresis in 10% or 12% polyacrylamide gel was performed in 0.1 M Tris-acetate (pH 8.3) as described by DeWachter and Fiers (9). 20% polyacrylamide gel was pre...

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Section: Resultssupporting

confidence: 75%

“…We have shown that these molecules accumulate in TS241 as the direct result of RNase P block (refs. 7 and 8 and H. Sakano and Y. Shimura, manuscript in preparation).…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

mentioning

confidence: 99%

See 2 more Smart Citations

Sequential processing of precursor tRNA molecules in Escherichia coli.

Sakano¹,

Shimura²

1975

Proc. Natl. Acad. Sci. U.S.A.

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Regulation of Gene Action in the Development of Lytic Bacteriophages

Rabussay

Geiduschek

1977

Regulation and Genetics

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Genetic analysis of the structure and function of RNase P fromE. coli

Shiraishi

Shimura

1996

Mol Biol Rep

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A brief review of the genetic studies on ribonuclease P (RNase P) from Escherichia coli is presented. Temperature-sensitive mutants of E. coli defective in tRNA processing were isolated by screening cells which were unable to synthesize a suppressor tRNA at restrictive temperature. Structural analysis of accumulated tRNA precursors showed that the isolated mutants were defective in RNase P activity. Analyses of the mutants revealed that the enzyme is essential for the synthesis of all tRNA molecules in cells and that the enzyme consists of two subunits. Analyses of the isolated mutants revealed a possible domain structure of the RNA subunit of the enzyme.

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Studies on T4‐tRNA biosynthesis: Accumulation of precursor tRNA molecules in a temperature sensitive mutant of Escherichia coli

Cited by 14 publications

References 10 publications

Sequential processing of precursor tRNA molecules in Escherichia coli.

Sequential processing of precursor tRNA molecules in Escherichia coli.

Regulation of Gene Action in the Development of Lytic Bacteriophages

Genetic analysis of the structure and function of RNase P fromE. coli

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