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 tRNA(Ala) molecule contains all of the internal oligonucleotides present in the corresponding tRNA(Ala) species plus new 5' and 3' terminal sequences. Precursor molecules to tRNA1(Gly) (which differ from each other in size) are contained in two other gel regions, and a fourth region contains a precursor to tRNA2(Gly). 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.
|Original language||English (US)|
|Number of pages||5|
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|State||Published - Jan 1 1978|
ASJC Scopus subject areas