藻胆体
藻蓝蛋白
蓝藻
生物
基因
蛋白质亚单位
遗传学
细菌
作者
Pamela B. Conley,Peggy G. Lemaux,Arthur Grossman
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:1985-11-01
卷期号:230 (4725): 550-553
被引量:105
标识
DOI:10.1126/science.3931221
摘要
The major light-harvesting complex in cyanobacteria and red algae, the phycobilisome, is composed of chromophoric and nonchromophoric polypeptides. Two linked genes encoding major chromophoric components, the polypeptide subunits of phycocyanin, were isolated from the cyanobacterium Fremyella diplosiphon . Transcripts from this phycocyanin subunit gene cluster were present as major species in the cyanobacterium grown in red light, but not in cultures maintained in green light. The genes for the subunits of the red light-induced phycocyanin were transcribed together (β-phycocyanin followed by α-phycocyanin) on two messenger RNA species; one contained 1600 bases while the other had 3800 bases. The latter, which encompassed the smaller transcript, contained additional sequences extending from the 3′ end of the coding region of the α-phycocyanin gene. It may encode other light-induced components of the phycobilisome. Since phycocyanin, which effectively absorbs red light, becomes a dominant constituent of the phycobilisome in red light, these different levels may reflect an important adaptive mechanism of these organisms to their environment.
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