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2004 OCT 6 - (NewsRx.com & NewsRx.net) -- Scientists have expressed an anti-atherosclerosis polypeptide vaccine in Escherichia coli.
According to recent research from China, "A chimeric polypeptide of TTP-CETPC was successfully expressed as inclusion bodies in Escherichia coli by fusing it with the C-terminus of asparaginase and a basic amino acid-rich peptide (KR). After partially purified by washing with 0.5% (v/v) Triton X-100 in 10 mM PB, the pellet was solubilized in 8 M urea. The solution was precipitated with single volume and double volumes of cold ethanol for removing impurities."
"The fusion protein in solution was precipitated with triple volumes of ethanol to increase purity and then hydrolyzed with 50 mM hydrochloric acid at 55 degrees C for 72 hours," reported Gaofu Qi and colleagues at China Pharmaceutical University. "The TTP-CETPC polypeptide was released after the unique acid-labile aspartylprolyl bond in the fusion protein was cleaved by acid. After impurities were removed by adjusting the hydrolysis solution pH to 9.45 and then to 8.37, the TTP-CETPC polypeptide was further purified by DEAE-cellulose column. The TTP-CETPC containing fractions were eluted at 60-80 mM NaCl."
"The purified TTP-CETPC cysteines were ...
Source: HighBeam Research, Anti-atherosclerosis polypeptide vaccine expressed in E. coli.