A new gene encoding tRNA(Pro) (GGG) is present in the chloroplast genome of black pine: a compilation of 32 tRNA genes from black pine chloroplasts.
Curr Genet, 1994/8;26(2):153-8.
Tsudzuki J[1], Ito S, Tsudzuki T, Wakasugi T, Sugiura M
Affiliations
PMID: 8001170
Impact factor: 2.695
Abstract
The chloroplast genome of black pine (Pinus thunbergii), a gymnosperm, contains 32 different tRNA genes, 30 of which correspond to those previously identified in tobacco and rice chloroplast genomes. Two additional genes encode tRNA(Pro) (GGG) and tRNA(Arg) (CCG); the former is newly identified while the latter is present in liverwort, Physcomitrella patens and Angiopteris lygodiifolia, chloroplast genomes. Moreover, a partial copy of the split tRNA(Gly) (UCC) gene and full copies of tRNA(His) (GUG), tRNA(Thr) (GGU) and tRNA(Ser) (GCU) genes are present in the large single-copy region of the genome, suggesting extensive rearrangements of the chloroplast genome during evolution. No tRNA genes whose tRNA products can recognize codons CUU/C (Leu) and GCU/C (Ala) have been found. We propose that the 32 tRNAs are sufficient to read all the 61 sense codons in the black pine system using the "two-out-of-three" and the "U:N wobble" mechanisms.
MeSH terms
Base Sequence; Chloroplasts; Cloning, Molecular; Codon; Genes, Plant; Molecular Sequence Data; Multigene Family; Nucleic Acid Conformation; RNA, Transfer, Amino Acid-Specific; RNA, Transfer, Pro; Sequence Homology, Nucleic Acid; Trees
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