果蝇和诺氏疟原虫核糖体核糖核酸中腺嘌呤和尿嘧啶残基分布不均的光谱学证据及其可能的进化意义。
Spectroscopic evidence for the uneven distribution of adenine and uracil residues in ribosomal ribonucleic acid of Drosophila melanogaster and of Plasmodium knowlesi and its possible evolutionary significance.
作者信息
Cox R A, Godwin E, Hastings J R
出版信息
Biochem J. 1976 Jun 1;155(3):465-75. doi: 10.1042/bj1550465a.
Abstract
RNA was isolated from subribosomal particles of the malaria parasite Plasmodium knowlesi. The nucleotide composition (mole fraction) of the principal species was obtained (S-rRNA, 0.295A, 0.36U, 0.25G, 0.105C: L-rRNA, 0.326A, 0.31U, 0.228G, 0.144C). Ribosomal RNA was also isolated from Drosophila melanogaster. Optical properties of these A + U-rich species were measured. In all four cases analysis of the hypochromic effect revealed that adenine and uracil residues tended to form clusters along the polynucleotide chain. A substantial fraction of residues was located in bihelical regions of approx. 50% G-C base pairs or in regions of approx. 30-35% G-C base pairs. The possible evolutionary significance of these results was considered on the basis of comparison with properties of rRNA from bacteria (Escherichia coli) and a mammal (rabbit reticulocyte).
摘要
从诺氏疟原虫的亚核糖体颗粒中分离出RNA。获得了主要种类的核苷酸组成（摩尔分数）（小核糖体RNA，0.295A、0.36U、0.25G、0.105C；大核糖体RNA，0.326A、0.31U、0.228G、0.144C）。还从黑腹果蝇中分离出核糖体RNA。测量了这些富含A+U种类的光学性质。在所有四种情况下，对减色效应的分析表明，腺嘌呤和尿嘧啶残基倾向于沿着多核苷酸链形成簇。相当一部分残基位于约50%G-C碱基对的双螺旋区域或约30-35%G-C碱基对的区域。基于与来自细菌（大肠杆菌）和哺乳动物（兔网织红细胞）的rRNA特性的比较，考虑了这些结果可能的进化意义。
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