The psychrotropic bacterium, Pseudoalteromonas sp. QI-I, which produces extracellular cold-active protease, was isolated from Antarctic seawater. The genomic DNA of this bacterium was used to construct a plasmid genom...The psychrotropic bacterium, Pseudoalteromonas sp. QI-I, which produces extracellular cold-active protease, was isolated from Antarctic seawater. The genomic DNA of this bacterium was used to construct a plasmid genomic library with the goal of screening cold-active protease genes. Gene pro-2127 with an open reading frame of 2127 bp encoding protease PRO-2127 was cloned and sequenced. Alignment of amino acid sequences suggested that the precursor of PRO-2127 was a member of subfamily S8A, and that it might contain four domains： a signal peptide, an N-terminal prosequence, a catalytic domain and a C-terminal extension. Amino acids Asp185, His244 and Ser425 might form a catalytic triad. PRO-2127 showed some structural features common to psychrophilic enzymes, such as a decrease in Arg residues and the Arg/（Arg＋Lys） ratio. Heterologous expression of pro-2127 in Escherichia coli BL21 （DE3） by pColdlII was also successfully observed in this study.展开更多
Editor’s note:The annual conference of the International Textile Manufacturers Federation(ITMF)was hosted from 17 to 19November 2016, at Hotel Marriott, Jaipur, India. The event saw the largest gathering of global te...Editor’s note:The annual conference of the International Textile Manufacturers Federation(ITMF)was hosted from 17 to 19November 2016, at Hotel Marriott, Jaipur, India. The event saw the largest gathering of global textile leaders. Held in India after a gap of 14 years, the three-day conference saw participation of over 370 delegates from across the world that included manufacturers, traders, retailers, economists, government officials and展开更多
基金supported by the National High Technology Research and Development Program of China (Grant no.2007AA091905)the Basic Scientific Research Operation Fund of China (Grant no. GY02-2007-T11)
文摘The psychrotropic bacterium, Pseudoalteromonas sp. QI-I, which produces extracellular cold-active protease, was isolated from Antarctic seawater. The genomic DNA of this bacterium was used to construct a plasmid genomic library with the goal of screening cold-active protease genes. Gene pro-2127 with an open reading frame of 2127 bp encoding protease PRO-2127 was cloned and sequenced. Alignment of amino acid sequences suggested that the precursor of PRO-2127 was a member of subfamily S8A, and that it might contain four domains： a signal peptide, an N-terminal prosequence, a catalytic domain and a C-terminal extension. Amino acids Asp185, His244 and Ser425 might form a catalytic triad. PRO-2127 showed some structural features common to psychrophilic enzymes, such as a decrease in Arg residues and the Arg/（Arg＋Lys） ratio. Heterologous expression of pro-2127 in Escherichia coli BL21 （DE3） by pColdlII was also successfully observed in this study.
文摘Editor’s note:The annual conference of the International Textile Manufacturers Federation(ITMF)was hosted from 17 to 19November 2016, at Hotel Marriott, Jaipur, India. The event saw the largest gathering of global textile leaders. Held in India after a gap of 14 years, the three-day conference saw participation of over 370 delegates from across the world that included manufacturers, traders, retailers, economists, government officials and
