The gene of chondroitinase 1816(ChSase1816) was overexpressed and purified from Escherichia coli BL21(DE3) with a molecular mass of 86 *** the chondroitin sulfate B(CS-B) as the substrate,the Km and Vmax values of ChS...
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The gene of chondroitinase 1816(ChSase1816) was overexpressed and purified from Escherichia coli BL21(DE3) with a molecular mass of 86 *** the chondroitin sulfate B(CS-B) as the substrate,the Km and Vmax values of ChSase1816 towards CS-B was 7.85 μg/mL and 1.21 U/*** optimum reaction temperature and pH for ChSase1816 were 30℃ and 8.0,*** ChSase1816 activity was stable at 30°C,but not stable at 50°C and 60°***,ChSase1816 retained more than 60% of its maximum activity at a broad pH range of pH 4.0 and *** the metal ions detected had inhibitory effects on the *** result of Circular dichroism(CD) indicated the enzyme contained many antiparallel structure and random *** antioxidant activity assay showed that hydroxyl radical scavenging activity of chondroitin enzymatic hydrolysates was higher than chondroitin sulfate.
The human glucagon receptor(GCGR) belongs to the class B G protein-coupled receptor(GPCR) family and plays a key role in glucose homeostasis and the pathophysiology of type 2 *** we report two crystal structures of fu...
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The human glucagon receptor(GCGR) belongs to the class B G protein-coupled receptor(GPCR) family and plays a key role in glucose homeostasis and the pathophysiology of type 2 *** we report two crystal structures of full-length GCGR containing both extracellular domain(ECD) and transmembrane domain(TMD) at different conformational ***,the stalk region,which connects the ECD and TMD,and the first extracellular loop(ECL1) undergo major conformational changes in secondary structure during peptide ligand binding,forming key interactions with the ***/deuterium exchange,disulfide cross-linking and molecular dynamics studies suggest that the stalk and ECL1 play critical roles in modulating peptide ligand binding and receptor *** further propose a dual-binding-site trigger model for GCGR activation,which requires conformational changes of the stalk,ECL1 and *** insights into the full-length GCGR structure deepen our understanding about the signaling mechanisms of class B GPCRs.
De novo peptide sequencing for an individual pure protein has improved remarkably with the progress of mass spectrometry but there still exists incomplete peptide fragmentation and indistingushiable series of fragment...
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De novo peptide sequencing for an individual pure protein has improved remarkably with the progress of mass spectrometry but there still exists incomplete peptide fragmentation and indistingushiable series of fragmented ions,which interrupted the interpretation of amino acid sequence of *** is even worse at proteome ***,we developed a series of high efficiency proteases,including LysargiNase with super activity and acetylated trypsin with high *** advantage of these two enzymes,we developed a novel algorithm,pNovoM for automated de novo sequencing of the mirrored peptides generated from the digestion of trypsin and LysargiNase *** combination of paired mirror image spectra results nearly complete series of product ions,which facilitate the de novo sequencing on both of purified protein and proteasome samples.
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