To biosynthesize fluorescent Spirulina platensis (Sp)β -phycocyanin (PC) in Escherichia coli, a BLASTP search for homologs of the cpeS gene, a chromophore lyase, was performed against the Synechocystis sp. PCC 6803 (...To biosynthesize fluorescent Spirulina platensis (Sp)β -phycocyanin (PC) in Escherichia coli, a BLASTP search for homologs of the cpeS gene, a chromophore lyase, was performed against the Synechocystis sp. PCC 6803 (S6) proteome. A highly homologous gene, slr2049, was obtained from the S6 genome. Sites 82 and 153 in -phycocyanin of Sp were modified by site-directed muta- genesis. Two recombinant expression vectors were constructed and transformed into E. coli BL21: (i) pCDF-cpcB (C153A)- slr2049-sll0583-ho1-pcyA; and (ii) pCDF-cpcB (C82I)-slr2049-sll0583-ho1-pcyA. Lyases encoded by the genes slr2049 and sll0583 catalyzed the linking of Sp 82β -PC to phycocyanobilin (PCB), and fluorescent CpcB (C153A)-PCB was generated. We present a strategy for the co-expression of multiple genes in a single expression vector to identify the function of an unknown gene. Recombinant phycobiliproteins produced on a large scale are promising fluorescent tags for diagnostics and pharmacology.展开更多
Green tides have occurred in the Yellow Sea successively from 2007 to 2011. Genetic analysis of the 5-year green-tide-forming algae needs to be performed to determine the source of the biomass and understand the mecha...Green tides have occurred in the Yellow Sea successively from 2007 to 2011. Genetic analysis of the 5-year green-tide-forming algae needs to be performed to determine the source of the biomass and understand the mechanism of the green tide blooms. In this study, free-floating green algae were collected at different sites in the Yellow Sea in 2010 and 2011. Data on 182 free-floating samples and 155 attached Ulva samples from previous studies on the Yellow Sea green tides from 2007 to 2009 were also taken into consideration. Morphology observation and molecular phylogenetic analyses indicated that the Yellow Sea green tides were dominated by a single species, Ulva prolifera, from 2007 to 2011. Considering that at least five Ulva species inhabit the north coast of China, the unialgal composition of the green tides implied that (1) there may be some special physiology and propagation pathways of U. prolifera for its rapid expansion, (2) the mechanisms of the Yellow Sea green tide formation were similar for the last five years, and (3) the intra-species genetic variation and population structure of U. prolifera need to be studied to determine the exact origin of the bloom-forming biomass.展开更多
The coastal zone spans both land and water, extending landward up to the highest water line that occurs on shore during storms and seaward to the point at which storm waves no longer move sediments on the seafloor. Th...The coastal zone spans both land and water, extending landward up to the highest water line that occurs on shore during storms and seaward to the point at which storm waves no longer move sediments on the seafloor. The specific contact line between land and sea is the shoreline and adjacent land is展开更多
Marine biotechnology emerged in the 1980s, and since then it has been gradually gaining momentum to meet growing demands that cannot be satisfied by terrestrial sources alone.
基金supported by the Jiangsu Provincial Marine Biotechnology Key Lab Open Foundation (2010HS02)a grant from the National Natural Science Foundation of China (Young Scholars,41006094)
文摘To biosynthesize fluorescent Spirulina platensis (Sp)β -phycocyanin (PC) in Escherichia coli, a BLASTP search for homologs of the cpeS gene, a chromophore lyase, was performed against the Synechocystis sp. PCC 6803 (S6) proteome. A highly homologous gene, slr2049, was obtained from the S6 genome. Sites 82 and 153 in -phycocyanin of Sp were modified by site-directed muta- genesis. Two recombinant expression vectors were constructed and transformed into E. coli BL21: (i) pCDF-cpcB (C153A)- slr2049-sll0583-ho1-pcyA; and (ii) pCDF-cpcB (C82I)-slr2049-sll0583-ho1-pcyA. Lyases encoded by the genes slr2049 and sll0583 catalyzed the linking of Sp 82β -PC to phycocyanobilin (PCB), and fluorescent CpcB (C153A)-PCB was generated. We present a strategy for the co-expression of multiple genes in a single expression vector to identify the function of an unknown gene. Recombinant phycobiliproteins produced on a large scale are promising fluorescent tags for diagnostics and pharmacology.
基金supported by the Public Science and Technology Research Funds Projects of Ocean (201205010)Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province(2010BSB02009)the National Science & Technology Pillar Program of China (2008BAC49B01)
文摘Green tides have occurred in the Yellow Sea successively from 2007 to 2011. Genetic analysis of the 5-year green-tide-forming algae needs to be performed to determine the source of the biomass and understand the mechanism of the green tide blooms. In this study, free-floating green algae were collected at different sites in the Yellow Sea in 2010 and 2011. Data on 182 free-floating samples and 155 attached Ulva samples from previous studies on the Yellow Sea green tides from 2007 to 2009 were also taken into consideration. Morphology observation and molecular phylogenetic analyses indicated that the Yellow Sea green tides were dominated by a single species, Ulva prolifera, from 2007 to 2011. Considering that at least five Ulva species inhabit the north coast of China, the unialgal composition of the green tides implied that (1) there may be some special physiology and propagation pathways of U. prolifera for its rapid expansion, (2) the mechanisms of the Yellow Sea green tide formation were similar for the last five years, and (3) the intra-species genetic variation and population structure of U. prolifera need to be studied to determine the exact origin of the bloom-forming biomass.
文摘The coastal zone spans both land and water, extending landward up to the highest water line that occurs on shore during storms and seaward to the point at which storm waves no longer move sediments on the seafloor. The specific contact line between land and sea is the shoreline and adjacent land is
文摘Marine biotechnology emerged in the 1980s, and since then it has been gradually gaining momentum to meet growing demands that cannot be satisfied by terrestrial sources alone.
