The sequence of the gene for cytochrome c oxidase subunit I, a frameshift containing gene for cytochrome c oxidase subunit II and seven unassigned reading frames in Trypanosoma brucei mitochondrial maxi-circle DNA.

The sequence of the gene for cytochrome c oxidase subunit I, a frameshift containing gene for cytochrome c oxidase subunit II and seven unassigned reading frames in Trypanosoma brucei mitochondrial maxi-circle DNA.
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细胞色素 c 氧化酶亚基 I 基因的序列、包含细胞色素 c 氧化酶亚基 II 基因的移码以及布氏锥虫线粒体大环 DNA 中的 7 个未分配的阅读框。

DOI:
10.1093/nar/12.19.7327
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发表时间:
1984
影响因子:
14.9
通讯作者:
R. Benne
R. Benne
中科院分区:
生物学2区
文献类型:
--
作者:
L. Hensgens;J. Brakenhoff;B. F. Vries;P. Sloof;M. Tromp;J. Boom;R. Benne

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布氏锥虫线粒体 DNA 最大环的 9.2 kb 片段包含细胞色素 c 氧化酶亚基 I 和 II(coxI 和 coxII)的基因以及七个未分配的阅读框(“URF”)。 coxI 和 coxII 的基因在氨基酸水平上与真菌和哺乳动物 mtDNA 中的相应基因表现出相当大的同源性(分别为 38% 和 25%),唯一引人注目的差异点是异常高的半胱氨酸含量(约 4.5%)。编码细胞色素c氧化酶亚基II的阅读框是不连续的:大约40个氨基酸的C端部分以相对于N端部分的-1阅读框存在于DNA序列中。 URF5、8和10分别与哺乳动物线粒体URF-1、4和5表现出较低但明显的同源性(约20%)。在 URF5 中,第一个 AUG 位于密码子 145 处,而与哺乳动物 URF-1 序列的广泛同源性发生在该位置的上游。 UUG 有可能作为起始密码子。 URF7 和 URF9 具有非常不寻常的氨基酸组成,并且不具有 AUG 或 UUG 起始密码子。这些 URF 可能不具有蛋白质编码功能。该片段不包含传统的 tRNA 基因。
A 9.2 kb segment of the maxi-circle of Trypanosoma brucei mitochondrial DNA contains the genes for cytochrome c oxidase subunits I and II (coxI and coxII) and seven Unassigned Reading Frames ("URFs"). The genes for coxI and coxII display considerable homology at the aminoacid level (38 and 25%, respectively) to the corresponding genes in fungal and mammalian mtDNA, the only striking point of divergence being an unusually high cysteine content (about 4.5%). The reading frame coding for cytochrome c oxidase subunit II is discontinuous: the C-terminal portion of about 40 aminoacids, is present in the DNA-sequence in a -1 reading frame with respect to the N-terminal moiety. URF5, 8 and 10, show a low but distinct homology (about 20%) to mammalian mitochondrial URF-1, 4 and 5, respectively. In URF5, the first AUG is found at codon 145, whereas extensive homology to mammalian URF-1 sequences occurs upstream of this position. The possibility exists that UUG can serve as an initiator codon. URF7 and URF9 have a highly unusual aminoacid composition and do not possess AUG or UUG initiator codons. These URFs probably do not have a protein-coding function. The segment does not contain conventional tRNA genes.