The RNA component of mitochondrial ribonuclease P from Aspergillus nidulans

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Abstract

Several RNA molecules that copurified with Aspergillus nidulans mitochondrial ribonuclease (RNase) P were identified [Lee, Y.C., Lee, B.J., Hwang, D.S. and Kang, H.S. (1996) Eur. J. Biochem. 225, 289-296], and their partial sequences were determined. Using an oligonucleotide probe, we cloned and mapped the gene encoding this putative RNA component of RNase P (RNase P-RNA), situated between URFA3 (unidentified reading frame A3) and cobA (apocytochrome b) genes in the mitochondrial genome of A. nidulans. The gene is extremely (A+T)-rich and contains two regions of sequence similarity conserved among the known mitochondrial RNase P-RNAs and the eubacterial RNase P-RNAs. The determination of 5' and 3' termini by primer extension and sequencing indicated that the length of the RNA transcript is 232 nucleotides. Northern-blot analysis revealed that its only subcellular location was the mitochondria. Two RNase P-RNA fragments of 110 nucleotides and 80 nucleotides, each containing one of the two conserved regions, could be recovered from the nuclease-treated enzyme without significant loss of activity. The sizes of these fragments appeared to be the minimum lengths required for the vitro activity of the enzyme.

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Lee, Y. C., Lee, B. J., & Kang, H. S. (1996). The RNA component of mitochondrial ribonuclease P from Aspergillus nidulans. European Journal of Biochemistry, 235(1–2), 297–303. https://doi.org/10.1111/j.1432-1033.1996.00297.x

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