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. 1978 Feb;75(2):635–639. doi: 10.1073/pnas.75.2.635

Identification of precursor molecules to individual tRNA species from Bombyx mori.

R L Garber, M A Siddiqui, S Altman
PMCID: PMC411310  PMID: 273226

Abstract

Short-labeled 4.5S RNA molecules isolated from the posterior silk gland of Bombyx mori can be separated by two-dimensional polyacrylamide gel electrophoresis into many discrete species, some of which are radiochemically pure by the criteria of RNA fingerprinting. One region of the gel contains two precursor RNAs, one to each of the known alanine transfer RNAs. Each precursor tRNAAla molecule contains all of the internal oligonucleotides present in the corresponding tRNAAla species plus new 5'-and 3'-terminal sequences. Precursor molecules to tRNA1Gly (which differ from each other in size) are contained in two other gel regions, and a fourth region contains a precursor to tRNA2Gly. Both of the transcription initiator purine tetraphosphate nucleosides are present in unfractionated tRNA precursor mixtures, with pppA- predominating over pppG-. Minor nucleotides are also present in B. mori tRNA precursors. No polycistronic tRNA gene transcripts were observed.

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