Lyase Activities of Heterologous CpcS and CpcT for Phycocyanin Holo-β-subunit from Arthrospira platensis in Escherichia coli  

作　　者：YI Junjie XU Di ZANG Xiaonan YUAN Dingyang ZHAO Bingran TANG Li TAN Yanning ZHANG Xuecheng 

机构地区：[1]Key Laboratory of Marine Genetics and Breeding (Ocean University of China),Ministry of Education [2]State Key Laboratory of Hybrid Rice,Hunan Hybrid Rice Research Center

出　　处：《Journal of Ocean University of China》2014年第3期497-502,共6页中国海洋大学学报（英文版）

基　　金：supported by the National Science and Technology Major Project of China (2008ZX08001-004)

摘　　要：Arthrospira platensis is an economically important cyanobacterium; and it has been used widely in food and pharmaceutical industries. The phycocyanin(PC) from A. platensis is extremely valuable in medicine and molecular biology due to its antioxidation and anti-tumoring activity and applicability as fluorescence protein tag. In present study, two recombinant plasmids, one contained the phycocyanobilin(PCB)-producing genes(hox1 and pcyA) while the other contained the phycobiliprotein gene(cpcB) and the lyase gene(either cpcS/U or cpcT), were constructed and synchronically transferred into E. coli in order to test the the activities of relevant lyases for catalysing PCB addition to CpcB during synthesizing fluorescent PC holo-β-subunit(β-PC) of A. platensis. As was evidenced by the fluorescence emitted at a peak specific for PC, CpcB was successfully synthesized in E. coli, to which co-expressed PCBs attached though at a relatively low efficiency. The results showed that the attachment of PCBs to CpcB were carried out mainly by co-expressed CpcS/U but CpcB also showed some autocatalytic activity. Currently, no CpcT activity was detected in this E. coli expression system. Further studies will be conducted to improve the efficiency of fluorescent PC synthesis in E. coli.Arthrospira platensis is an economically important cyanobacterium;and it has been used widely in food and pharmaceu-tical industries. The phycocyanin （PC） from A. platensis is extremely valuable in medicine and molecular biology due to its anti-oxidation and anti-tumoring activity and applicability as fluorescence protein tag. In present study, two recombinant plasmids, one contained the phycocyanobilin （PCB）-producing genes （hox1 and pcyA） while the other contained the phycobiliprotein gene （cpcB） and the lyase gene （either cpcS/U or cpcT）, were constructed and synchronically transferred into E. coli in order to test the the activi-ties of relevant lyases for catalysing PCB addition to CpcB during synthesizing fluorescent PC holo-β-subunit （β-PC） of A. platensis. As was evidenced by the fluorescence emitted at a peak specific for PC, CpcB was successfully synthesized in E. coli, to which co-expressed PCBs attached though at a relatively low efficiency. The results showed that the attachment of PCBs to CpcB were carried out mainly by co-expressed CpcS/U but CpcB also showed some autocatalytic activity. Currently, no CpcT activity was de-tected in this E. coli expression system. Further studies will be conducted to improve the efficiency of fluorescent PC synthesis in E. coli.

关 键 词：ARTHROSPIRA CpcB phycocyanobilin lyase CpcS CpcT 

分 类 号：Q946.1[生物学—植物学]