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Bacillus is remarkable for its extracellular enzyme production (Priest, 1977). When Bacillus cells exhaust the nutrients of the environment and enter into the stationary phase, neutral and alkaline proteases encoded by nprE and aprE respectively are produced and secreted to the outside environment (Chaloupka and Kreckova, 1966; Din et al., 1969). The(More)
Research towards nucleic acid amplification technologies for detection of human papillomavirus (HPV) 16 E6/E7 mRNA was carried out in combination with microchip electrophoresis (MCE). The approaches of nucleic acid sequence based amplification (NASBA), one-step RT-PCR and two-step RT-PCR were successfully developed. NASBA was a simple enzymatic reaction,(More)
To identify new enzymatic bottlenecks of l-tyrosine pathway for further improving the production of l-tyrosine and its derivatives. When ARO4 and ARO7 were deregulated by their feedback resistant derivatives in the host strains, the ARO2 and TYR1 genes, coding for chorismate synthase and prephenate dehydrogenase were further identified as new important(More)
A new mazF-based strategy for large-scale and scarless genome rearrangements in Saccharomyces cerevisiae was developed. We applied this method to delete designed internal (26.5 kbp) and terminal (28.9 kbp) regions located on the left arm of the chromosome XI of S. cerevisiae BY4741. The number of transformants was increased by one order of magnitude and(More)
Bacillus subtilis aconitase, encoded by the citB gene, is a bifunctional enzyme, which can not only interconvert citrate and isocitrate, but also has the RNA binding function similar to the eukaryotic protein IRP-1 (iron regulatory protein 1). Homology analysis between eukaryotic aconitase and B. subtilis aconitase indicates that the amino acids 741–745(More)
Simultaneous ammonium and phosphate removal characteristics and mechanism, as well as the major influencing factors, such as pH, temperature and co-existing ions, onto NaOH-activated and lanthanum-impregnated zeolite (NLZ) were investigated. The phosphate adsorption increases from 0.2 mg g-1 for natural zeolite up to 8.96 mg g-1 for NLZ, while only a slight(More)
A mini-Tn10 transposon mutagenesis library of strain Bacillus amyloliquefaciens BAhja NK10 was constructed and one mutant, L4, exhibiting markedly enhanced antagonistic activity against Micrococcus luteus, was screened and possessed an inactivated purL gene. A similar antibacterial spectrum was observed for both L4 and wild-type strains, but L4 displayed a(More)
In biotechnological industry, increased expression cassette stability and copy number serve as important means of maintaining consistently high production levels of heterologous proteins in Saccharomyces cerevisiae. In this study, we combined δ sequences for site-specific integration with TPI1 gene from Schizosaccharomyces pombe (POT1) as a selection marker(More)
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