77 U/mg. The soluble LIP-948 was purified with amylase affinity chromatography and its enzymatic characters were studied. The optimal temperature and pH of LIP-948 was 35 degrees C and 8, respectively. The activity of LIP-948 dropped dramatically after incubation at 50 degrees C for 15 min and was enhanced by Sr2+, Ca2+. It preferentially hydrolyzed 4-nitrophenyl esters with the shorter carbon

chain. (c) 2011 Elsevier Inc. All rights reserved.”
“The Epstein-Barr virus (EBV) is an important human pathogen that is associated with multiple cancers. see more The major oncoprotein of the virus, latent membrane protein 1 (LMP1), is essential for EBV B-cell immortalization and is sufficient to transform rodent fibroblasts. This viral transmembrane protein activates multiple cellular signaling pathways by engaging critical effector molecules and thus acts as a ligand-independent growth factor receptor. LMP1 is thought to signal from internal lipid raft containing membranes; however, the mechanisms through which these events occur remain largely unknown. Lipid rafts are microdomains within membranes that are rich in cholesterol and sphingolipids. Lipid rafts act as organization centers for biological Selleck Gemcitabine processes, including signal transduction, protein trafficking,

and pathogen entry and egress. In this study, the recruitment of key signaling components to lipid raft microdomains by LMP1 was analyzed. LMP1 increased the localization of phosphatidylinositol

3-kinase (PI3K) and its activated downstream target, Akt, to lipid rafts. In addition, mass spectrometry analyses identified www.selleck.cn/products/ganetespib-sta-9090.html elevated vimentin in rafts isolated from LMP1 expressing NPC cells. Disruption of lipid rafts through cholesterol depletion inhibited PI3K localization to membranes and decreased both Akt and ERK activation. Reduction of vimentin levels or disruption of its organization also decreased LMP1-mediated Akt and ERK activation and inhibited transformation of rodent fibroblasts. These findings indicate that LMP1 reorganizes membrane and cytoskeleton microdomains to modulate signal transduction.”
“We recently reported a one-step affinity purification method using a silica-binding protein, designated Si-tag, as a fusion partner and silica particles as the specific adsorbents (Ikeda et al., Protein Expr. Purif. 71 [2010] 91-95) [13]. In this study, we demonstrate that the Si-tag also binds to the silica surface even under denaturing conditions, thereby facilitating affinity purification of recombinant proteins from inclusion bodies. A fusion protein of the Si-tag and a biotin acceptor peptide (AviTag), which was expressed as inclusion bodies in Escherichia coli, was used as a model protein. To simplify our purification method, we disrupted recombinant E. coli cells by sonication in the presence of 8 M urea with concomitant solubilization of the inclusion bodies.