SEQUENCE AND ORGANIZATION OF A 7.2 KB REGION OF WHEAT MITOCHONDRIAL-DNA CONTAINING THE LARGE SUBUNIT (26S) RIBOSOMAL-RNA GENE

被引:9
|
作者
SPENCER, DF [1 ]
SCHNARE, MN [1 ]
COULTHART, MB [1 ]
GRAY, MW [1 ]
机构
[1] DALHOUSIE UNIV, CANADIAN INST ADV RES, DEPT BIOCHEM, PROGRAM EVOLUT BIOL, HALIFAX B3H 4H7, NS, CANADA
关键词
MITOCHONDRIAL DNA; REPEATED SEQUENCES; RIBOSOMAL RNA; T-ELEMENTS; TRITICUM-AESTIVUM; WHEAT;
D O I
10.1007/BF00014506
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We report the sequence of a 7.2 kilobase pair DNA fragment containing a copy of the wheat mitochondrial gene (rrn26) that encodes the mitochondrial large-subunit ribosomal RNA (26S rRNA). The mature 26S rRNA was determined by direct RNA sequencing to be 3467 nucleotides long, and to share a 5'-terminal pentanucleotide (5'-AUCAU), thought to be important in post-transcriptional processing, with the wheat mitochondrial small-subunit (18S) rRNA. Two other prominent features of the sequence were noted. First, upstream of rrn26 are located two tandem copies of a 70 base pair element containing a putative mitochondrial promoter motif (TCGTATAAAAA). Second. downstream of rrn26 is a sequence element that, if transcribed, would produce an RNA with a secondary structure resembling that of tRNAs but differing sufficiently from the latter structure to preclude any transcript from functioning normally in translation. These upstream and downstream sequence elements may play a role in the expression of rrn26 in wheat mitochondria.
引用
收藏
页码:347 / 352
页数:6
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