Kostrzewa M, Valentin K, Maid U, Radetzky R, Zetsche K
Institut für Pflanzenphysiologie, Justus-Liebig-Universität, Giessen, Federal Republic of Germany.
Curr Genet. 1990 Dec;18(5):465-9. doi: 10.1007/BF00309918.
In the multicellular red alga Antithamnion spec. both rubisco genes (rbcL and rbcS) are encoded on the plastid DNA (ptDNA). Both genes are separated by a short A/T-rich spacer of 100 bp and are cotranscribed into an mRNA of approximately 2.7 kb. These findings are in extensive agreement with those obtained from two unicellular red algae (Porphyridium aerugineum and Cyanidium caldarium). The large subunit (LSU) of rubisco shows an amino acid homology of 82-87% with the LSUs from the two unicellular red algae and only about 55% to LSUs from green algae, higher plants and two cyanobacteria. The small subunit (SSU) of rubisco is more similar to those from the unicellular red algae and two algae which are members of the Chromophyta (about 60% homology) than to cyanobacterial and higher plant proteins (27-36% homology). These data indicate that rhodoplasts originated independently from the chloroplast line. The plastids of chromophytes and rhodophytes appear to be closely related.
在多细胞红藻Antithamnion spec.中，两种核酮糖-1,5-二磷酸羧化酶基因（rbcL和rbcS）均由质体DNA（ptDNA）编码。这两个基因被一个100 bp的富含A/T的短间隔区隔开，并共同转录成一个约2.7 kb的mRNA。这些发现与从两种单细胞红藻（铜绿紫球藻和嗜热蓝隐藻）中获得的结果广泛一致。核酮糖-1,5-二磷酸羧化酶的大亚基（LSU）与两种单细胞红藻的大亚基氨基酸同源性为82 - 87%，与绿藻、高等植物和两种蓝细菌的大亚基同源性仅约为55%。核酮糖-1,5-二磷酸羧化酶的小亚基（SSU）与单细胞红藻和两种属于色藻门的藻类的小亚基更相似（约60%同源性），而与蓝细菌和高等植物的蛋白质同源性较低（27 - 36%同源性）。这些数据表明红藻质体独立于叶绿体谱系起源。色藻和红藻的质体似乎密切相关。
