PubMed · 9623954
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E Nisoli, M O Carruba, A Valerio, G Borsani. 1998. Hypocretins or hyporexins?. https://doi.org/10.1038/nm0698-645c
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A microbial array chip with collagen gel spots entrapping living Escherichia coli (E. coli) DH5alpha was applied for the screening of recombinant protein solubilities. The alpha-fragment of beta-galactosidase (betaGal) was fused to the target protein, namely, maltose-binding protein (MBP), to monitor the solubility of MBP. Scanning electrochemical microscopy (SECM) was used to detect the release of p-aminophenol from E. coli cells catalyzed by intracellular betaGal. Comparison of the SECM-based method with the Western blotting-based method indicated that the current response obtained using SECM increased with an increase in the betaGal activity and therefore, with the soluble fraction of MBP in the host cells.
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Although cullin-1 neddylation is crucial for the activation of SCF ubiquitin E3 ligases, the underlying mechanisms for NEDD8-mediated activation of SCF remain unclear. Here we demonstrate by NMR and mutational studies that NEDD8 binds the ubiquitin E2 (UBC4), but not NEDD8 E2 (UBC12). Our data imply that NEDD8 forms an active platform on the SCF complex for selective recruitment of ubiquitin-charged E2s in collaboration with RBX1, and thereby upregulates the E3 activity.