Pritchard A E, Sable C L, Venuti S E, Cummings D J
Department of Microbiology and Immunology, University of Colorado Health Sciences Center, Denver 80262.
Nucleic Acids Res. 1990 Jan 11;18(1):163-71. doi: 10.1093/nar/18.1.163.
The mitochondrial (mt) encoded ndh1, ndh3, ndh4, ndh5, rpl14, cyt b and atp9 gene products were identified by sequence comparisons with known proteins. Amino acid sequence comparisons between predicted Paramecium mt gene products and proteins in current databases were quantitated approximately by the means of similarity scores for pairs of aligned sequences. The comparisons show that the Paramecium gene products are very divergent from all others with the exception of those from a closely related ciliate, Tetrahymena. The similarity scores of comparisons between a Paramecium mt DNA encoded protein, cytochrome b for example, and the homologous protein from a group of organisms as diverse as other protozoans, vertebrates, fungi, plants, and prokaryotes were all about the same. The Paramecium gene products appear to be equally divergent from proteins representing a number of different kingdoms and organelles.
通过与已知蛋白质进行序列比较,鉴定出线粒体(mt)编码的ndh1、ndh3、ndh4、ndh5、rpl14、细胞色素b和atp9基因产物。通过比对序列对的相似性得分,大致定量了预测的草履虫线粒体基因产物与当前数据库中蛋白质之间的氨基酸序列比较。比较结果表明,除了来自密切相关的纤毛虫四膜虫的那些产物外,草履虫基因产物与所有其他产物都有很大差异。例如,草履虫线粒体DNA编码的蛋白质细胞色素b与来自其他原生动物、脊椎动物、真菌、植物和原核生物等多种生物的同源蛋白质之间的比较相似性得分都大致相同。草履虫基因产物似乎与代表许多不同界和细胞器的蛋白质同样存在差异。