Citations Search

Search Within Results

Need Assistance

Sort By:

J. Biochem. 148, 721–32. A recombinant catalytic domain of matriptase induces detachment and apoptosis of small-intestinal epithelial IEC-6 cells cultured on laminin-coated surface. 2010

Mochida, S., Tsuzuki, S., Inouye, K. and Fushiki, T.

Notes: The authors determined that a recombinant catalytic domain of rat matriptase (His6t-S-CD) caused detachment of small-intestinal epithelial cells (IEC-6 cells) from laminin-coated plates. His6t-S-CD was expressed in the yeast P. pastoris and purified by ammonium sulfate precipitation, gel filtration through a PD-10 column, then Ni2+-chelating chromatography using HisLink™ Resin. The authors also treated IEC-6 cells with purified His6t-S-CD to determine if this domain induced apoptosis by monitoring annexin-V staining, DNA fragmentation and caspase-3 activity. For the DNA fragmentation analysis, IEC-6 cells were treated with His6t-S-CD, then harvested, and genomic DNA was purified using the Wizard® SV Gel and PCR Clean-Up System. DNA fragmentation was assessed by agarose gel electrophoresis and ethidium bromide staining. (4100)

Expand Full Notes »

J. Bacteriol. 187, 8026-8038. Comparative Analysis of Two Classes of Quorum-Sensing Signaling Systems that Control production of Extracellular Proteins and Secondary Metabolites in Erwinia Carotovora Subspecies 2005

Chatterjee, A., Cui, Y. Hasegawa, H., Leigh, N., Dixit, V., Chatterjee, A.K.

Notes: Production of extracellular proteins in E. Carotovora subspecies that are critical for the development of soft-rotting disease of plants, is controlled by quorum-sensing signals, plant signals and assorted transcriptional factors and post-transcriptional regulators. Of these, post-transcriptional regulation by the RsmA-RsmB RNA pair is critical. RsmA is a small RNA-binding protein that promotes decay of RNA. RsmB specifies an untranslated regulatory RNA that binds RsmA and neutralizes its regulatory effect. Many of the transcription factors and QS signals known to regulate extracellular protein production actually act via these post-transcriptional regulators. ExpR, the putative AHL (N-acetyl homoserine lactone) receptor of E. carotovora subspecies carotovora, activates transcription of rmsA and AHL prevents this activation. The authors generated PCR fragments using primers for rsmA71 and rsmA153 and then used the Wizard(R) SV Gel and PCR Clean-Up System (Cat.# A9281) to purify PCR-generated DNA fragments used in gel mobility shift assays. Band shift assays revealed that ExpR is a DNA-binding protein and that its DNA-binding property is modified by AHL. In addition they showed that RsmA overproduction is responsible for inhibition of extracellular protein. (3572)

Expand Full Notes »