Abstract
The adaptive level of tRNAs to their use for synthesizing silk proteins involves three isoaccepting serine tRNAs. The two lipophilic tRNA 2a and tRNA 2b species from the posterior silkgland of the silkworm Bombyx mori , which are able to decode the UCG and UCU, UCC, UCA respectively, have been purified by counter-current distribution. They have been subjected to pancreatic and T 1 ribonucleases digestion. Resulting oligoribonucleotides have been analyzed and partially sequenced. The IGA anticodon found in the dodecanucleotide: Y-A-G-A-m 3C-U- I-G-A-i 6A-A-ψp for the preponderant tRNA 2b is consistent with the occurrence of UCA as the main serine codon in fibroin mRNA. A CGA anticodon has been detected in the homologous fragment of a minor isoaccepting tRNA 2a.
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