Netzker R, Köchel H G, Basak N, Küntzel H
Nucleic Acids Res. 1982 Aug 11;10(15):4783-94. doi: 10.1093/nar/10.15.4783.
The complete nucleotide sequence of a 14 kb segment of A. nidulans mtDNA reveals a rather compact organization of genes transcribed from the same strand and coding for two functionally known proteins, seven unidentified polypeptides (URFs), 24 tRNAs and two rRNAs. One of the URFs is located in the intron of the L-rRNA gene and codes for a basic protein of 410 residues. The other URFs are in spacer regions and code for hydrophobic proteins. URFa is homologous to human URF4, and URFb produces a polypeptide of 48 residues resembling the human URF6L product (hydrophobic N-terminus, basic C-terminus). The ATPase subunit 6 genes from mitochondria and E. coli appear to share a common ancestor. The codon frequencies of identified genes and URFs are similar, and codons ending with G or C are rarely used. The structures of tRNAs specific for arginine, asparagine, tyrosine and histidine are deduced from gene sequences.
构巢曲霉线粒体DNA一个14kb片段的完整核苷酸序列显示,从同一条链转录而来的基因组织相当紧密,这些基因编码两种功能已知的蛋白质、7种未鉴定的多肽(URF)、24种tRNA和两种rRNA。其中一个URF位于L-rRNA基因的内含子中,编码一种410个残基的碱性蛋白。其他URF位于间隔区,编码疏水蛋白。URFa与人的URF4同源,URFb产生一种48个残基的多肽,类似于人URF6L的产物(疏水的N端,碱性的C端)。线粒体和大肠杆菌的ATPase亚基6基因似乎有一个共同的祖先。已鉴定基因和URF的密码子频率相似,以G或C结尾的密码子很少使用。从基因序列推导了精氨酸、天冬酰胺、酪氨酸和组氨酸特异性tRNA的结构。