Baier K, Nicklisch S, Grundner C, Reinecke J, Lockau W
Humboldt-Universität zu Berlin, Institut für Biologie, Biochemie der Pflanzen, Chausseestrasse 117, 10115, Berlin, Germany.
FEMS Microbiol Lett. 2001 Feb 5;195(1):35-9. doi: 10.1111/j.1574-6968.2001.tb10494.x.
One of the responses exhibited by cyanobacteria when they are limited for an essential nutrient is the rapid degradation of their light-harvesting complex, the phycobilisome. Phycobilisome degradation is an ordered proteolytic process, visible by a color change of the cyanobacterial cell from blue-green to yellow-green (chlorosis). The small polypeptide NblA plays a key role in degradation of phycobilisomes in Synechococcus sp. PCC7942. Unlike Synechococcus, Synechocystis sp. PCC6803 has two nblA-homologous genes, nblA1 and nblA2, which are contiguous on the genome. Here we show that nblA1 and nblA2 are simultaneously expressed in Synechocystis 6803 upon nitrogen deprivation, and are both required for phycobilisome degradation.
当蓝藻缺乏必需营养物质时，它们表现出的一种反应是其捕光复合体——藻胆体的快速降解。藻胆体降解是一个有序的蛋白水解过程，通过蓝藻细胞从蓝绿色变为黄绿色（褪绿）的颜色变化可见。小多肽NblA在聚球藻属PCC7942中藻胆体的降解中起关键作用。与聚球藻不同，集胞藻属PCC6803有两个nblA同源基因，nblA1和nblA2，它们在基因组上相邻。在这里我们表明，在集胞藻6803中，氮缺乏时nblA1和nblA2会同时表达，并且它们都是藻胆体降解所必需的。
