STRUCTURE OF THE RUBISCO OPERON FROM THE UNICELLULAR RED ALGA CYANIDIUM-CALDARIUM - EVIDENCE FOR A POLYPHYLETIC ORIGIN OF THE PLASTIDS

被引:61
作者
VALENTIN, K
ZETSCHE, K
机构
[1] Institut für Pflanzenphysiologie, Justus-Liebig-Universität, Giessen
来源
MOLECULAR & GENERAL GENETICS | 1990年 / 222卷 / 2-3期
关键词
Endosymbiosis; Plastid evolution; Rhodophyta; Ribulose-1,5-bisphosphate carboxylase;
D O I
10.1007/BF00633849
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The genes for both subunits of ribulose-1,5-bisphosphate-carboxylase/oxygenase (Rubisco) were located on the plastid DNA (ptDNA) of the unicellular red alga Cyanidium caldarium. Both genes are organized together in an operon. The sequence homology of both genes to the corresponding genes from the unicellular red alga Porphyridium aerugineum is remarkably high, whereas homology to Rubisco genes from chloroplasts and two recent cyanobacteria is significantly lower. These data provide strong evidence for a polyphyletic origin of chloroplasts and rhodoplasts. In addition the genes for the small subunit of Rubisco (rbcS) from red algae show about 60% homology to rbcS genes from cryptophytes and chromophytes. Thus, homologies in the rbcS gene indicate a close phylogenetic relationship between rhodoplasts and the plastids of Chromophyta. © 1990 Springer-Verlag.
引用
收藏
页码:425 / 430
页数:6
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