San Chih Lee

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The construction and purification of recombinant baculovirus vectors for the expression of foreign genes in insect cells by standard transfection and plaque assay methods can take as long as 4 to 6 weeks. This period can be reduced to several days by using a novel baculovirus shuttle vector (bacmid) that can replicate in Escherichia coli as a plasmid and(More)
The effect of overexpression of the heat shock chaperone genes dnaK and groESL on heterologous protein production in Escherichia coli was examined, using a set of related human procollagenase proteins. A diverse range of effects on protein solubility, secretion, and accumulation was observed, and these effects were highly dependent on the particular(More)
Site-specific transposition in Escherichia coli was used to introduce foreign genes into the Autographica californica nuclear polyhedrosis baculovirus genome. Using a temperature-sensitive donor plasmid and an E. coli host strain with an occupied Tn7 attachment site it was possible to select directly for 'bacmid' recombinants at 44 degrees C. A blue to(More)
Recent advances in protein expression in E. coli have focused primarily on the enhancement of protein quality. Problems in mRNA translation such as inefficient initiation, mistranslation, frame-shifting and frame-hopping can often be addressed by altering heterologous gene-coding sequences. Fusion technology can also be used to address problems in(More)
AIM To identify the genes related to lymph node metastasis in human hepatocellular carcinoma (HCC), 32 HCC patients with or without lymph node metastasis were investigated by high-throughput microarray comprising 886 genes. METHODS The samples of cancerous and non-cancerous paired tissue were taken from 32 patients with HCC who underwent hepatectomy with(More)
Direct measurements of intracellular pH was made with recessed-tip pH microelectrodes in fertilized eggs of the frog, Xenopus laevis, from approximately 1 h after fertilization to mid-blastula. The intracellular pH just before first cleavage was 7.65 +/- 0.04 (SD; n = 9). By stage 5 to the middle of stage 6, average intracellular pH was 7.70 +/- 0.06 (SD; n(More)
The effects of various dietary and hormonal treatments on mitochondrial and cytosol histidine-pyruvate aminotransferases have been compared. In rats injected for 3 days with glucagon or dibutyryl cyclic adenosine 3’,5’-monophosphate (cyclic AMP), mitochondrial histidine-pyruvate aminotransferase activity increased 70fold and 48-fold, respectively, compared(More)