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核糖体蛋白基因保留在来自长眼虫的73 kb DNA上，该DNA类似于眼虫叶绿体DNA。

Genes for ribosomal proteins are retained on the 73 kb DNA from Astasia longa that resembles Euglena chloroplast DNA.

作者信息

Siemeister G, Buchholz C, Hachtel W

机构信息

Botanisches Institut, Universität Bonn, Federal Republic of Germany.

出版信息

Curr Genet. 1990 Dec;18(5):457-64. doi: 10.1007/BF00309917.

DOI:10.1007/BF00309917
PMID:2078869
Abstract

The nucleotide sequence of a 6.7 kb segment of the circular 73 kb DNA from Astasia longa has been determined. We identified genes for a tRNA-Ile (CAU), a tRNA-Phe (GAA), a tRNA-Cys (GCA) and the ribosomal proteins CS8, CL36, CS14 and CS2, that are normally encoded by plastid genomes. In addition, a gene for the chloroplast ribosomal protein CL5 was found that is not encoded by the plastome in either higher plants or a liverwort, but has recently been identified in Euglena chloroplast DNA. Transcripts of these protein genes, and of an unidentified open reading frame (ORF50), were detected. These results support our previous suggestion that the 73 kb DNA from Astasia is a truncated form of plastid DNA. The 73 kb DNA resembles the chloroplast DNA of Euglena gracilis but contains, almost exclusively, genes for a plastid-type translational (and presumably transcriptional) apparatus.

摘要

已经确定了来自长眼虫（Astasia longa）的环状73 kb DNA中一段6.7 kb片段的核苷酸序列。我们鉴定出了通常由质体基因组编码的异亮氨酸tRNA（CAU）、苯丙氨酸tRNA（GAA）、半胱氨酸tRNA（GCA）以及核糖体蛋白CS8、CL36、CS14和CS2的基因。此外，还发现了一个叶绿体核糖体蛋白CL5的基因，该基因在高等植物或地钱的质体基因组中均未编码，但最近在眼虫叶绿体DNA中被鉴定出来。检测到了这些蛋白质基因以及一个未鉴定的开放阅读框（ORF50）的转录本。这些结果支持了我们之前的推测，即来自长眼虫的73 kb DNA是质体DNA的截短形式。73 kb DNA类似于纤细眼虫（Euglena gracilis）的叶绿体DNA，但几乎只包含质体类型的翻译（可能还有转录）装置的基因。

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