Polymer conjugation was found highly valuable in clinic to improve the bioavailability of protein therapeutics.However,it is still a tremendous challenge to achieve a complete release of original proteins from the con...Polymer conjugation was found highly valuable in clinic to improve the bioavailability of protein therapeutics.However,it is still a tremendous challenge to achieve a complete release of original proteins from the conjugated hybrid under external stimulus to recover active proteins in the targeted tissue.Herein,we report a general light-controlled protein delivery methodology by weaving a photodegradable polymer cocoon around proteins,which could reliably protect them from degradation in the dark while efficiently releasing them under illumination without any residual atoms.The surface charge of the polymer shell is easily tunable to facilitate efficient cell uptake.The versatility of this strategy is demonstrated by the delivery of the Cas9/sg RNA complex that realized light-controlled gene editing both in vitro and in vivo,and such repertoire is of particular value in regard to minimizing the off-target toxicity of CRISPR-Cas9-based gene therapy.展开更多
Tea polysaccharide conjugates(TPCs) were water-extracted and purified from low-grade green tea. Although TPC contains 1.97% covalent binding proteins, Coomassie brilliant blue G250 and R250 could not detect this pro...Tea polysaccharide conjugates(TPCs) were water-extracted and purified from low-grade green tea. Although TPC contains 1.97% covalent binding proteins, Coomassie brilliant blue G250 and R250 could not detect this protein. The "should-shape" absorption peak observed at 250-280 nm in the UV-Vis spectrum was caused by quinone compounds derived from polyphenol oxidation during TPC extraction. The UV-Vis spectrum could be used to detect the decolorizing degree of TPC. TPC aqueous solution merely presented the negative charge properties of its polysaccharides instead of the acid-base property of its protein section, and exhibited higher stability at pH greater than 5.0. No precipitation or haze occurred in three TPC/epigallocatechin gallate(EGCG) aqueous mixtures during 12 h storage. TPC had emulsifying activity, which indicated that its protein moiety formed hydrophobic groups. It is proposed that some of the physicochemical properties of the TPC protein moiety are shielded by its polysaccharide chain.展开更多
Pneumonia remains the single leading cause of childhood death worldwide.Despite the commercial availability of multiple pneumococcal conjugate vaccines(PCVs),high dosage cost and supply shortages prevent PCV delivery ...Pneumonia remains the single leading cause of childhood death worldwide.Despite the commercial availability of multiple pneumococcal conjugate vaccines(PCVs),high dosage cost and supply shortages prevent PCV delivery to much of the developing world.The current work presents high-yield pneumococcal conjugates that are immunogenic in animals and suitable for use in human vaccine development.The 13-valent pneumococcal conjugate vaccine(PCV-13)investigated in this research incorporated serotypes 1,3,4,5,6A,6B,7F,9V,14,18C,19A,19F,and 23F.Pneumococcal polysaccharides(PnPSs)and CRM197 carrier protein were produced and purified in-house,and used to prepare PnPS-CRM conjugates using unique,cyanide-free,in vacuo glycation conjugation methods.In vitro characterization confirmed the generation of higher molecular weight PnPS-CRM conjugates low in free protein.In vivo animal studies were performed to compare PnuVax's PCV-13 to the commercially available PCV-13,Prevnar®13(Pfizer,USA).A boost dose was provided to all groups post-dose 1 at t?14 days.Post-dose 2 results at t?28 days showed that all 13 serotypes in PnuVax's PCV-13 were boostable.Per serotype IgG GMCs demonstrated that PnuVax's PCV-13 is immunogenic for all 13 serotypes,with 10 of the 13 serotypes statistically the same or higher than Prevnar®13 post-dose 2.As a result,the novel polysaccharideprotein conjugates developed in this work are highly promising for use in human PCV development.The in vacuo conjugation technique applied in this work could also be readily adapted to develop many other conjugate vaccines.展开更多
目的制备A群膜炎球菌多糖(Group A meningococcal polysaccharide,GAMP)-白喉毒素无毒变异体CRM197(Cross-reactive material 197)结合物,并分析其理化性质及免疫学特性。方法白喉棒状杆菌C7 M1菌株经发酵培养表达CRM197,表达产物经DEAE...目的制备A群膜炎球菌多糖(Group A meningococcal polysaccharide,GAMP)-白喉毒素无毒变异体CRM197(Cross-reactive material 197)结合物,并分析其理化性质及免疫学特性。方法白喉棒状杆菌C7 M1菌株经发酵培养表达CRM197,表达产物经DEAE-4FF层析柱进行纯化,纯化产物经SDS-PAGE及Western blot鉴定。用溴化氰(CNBr)活化GAMP,己二酰肼(ADH)为连接剂,在碳二亚胺(EDAC)催化下将GAMP与CRM197共价结合,制备GAMP-ADH-CRM197结合物,经Sepharose 4FF层析柱纯化后,进行各项生化检测,采用免疫双扩散检测结合物的抗原性,将结合物皮下注射ICR小鼠,间接ELISA法检测小鼠血清中抗GAMP的抗体滴度,分析其免疫原性。结果发酵培养20 h时,菌液上清中的CRM197蛋白表达量最高;CRM197以分泌形式表达,纯化后纯度达95%以上,可与白喉类毒素单抗发生特异性反应;GAMP-ADH-CRM197结合物各项生化指标均符合《中国药典》三部(2010版)要求,与A群流脑诊断血清形成明显的沉淀线,结合物诱生的多糖特异性抗体滴度显著高于多糖组和混合物组。结论成功制备了GAMP-ADH-CRM197结合物,其具有良好的抗原性和免疫原性,为以CRM197为蛋白载体制备脑膜炎球菌结合疫苗奠定了基础。展开更多
We study a three-dimensional off-lattice protein folding model, which involves two species of residues interacting through Lennard-Jones potentials. By incorporating an extra energy contribution into the original pote...We study a three-dimensional off-lattice protein folding model, which involves two species of residues interacting through Lennard-Jones potentials. By incorporating an extra energy contribution into the original potential function, we replace the original constrained problem with an unconstrained minimization of a mixed potential function. As such an efficient quasi-physical algorithm for solving the protein folding problem is presented. We apply the proposed algorithm to sequences with up to 55 residues and compare the computational results with the putative lowest energy found by several of the most famous algorithms, showing the advantages of our method. The dynamic behavior of the quasi-physlcal algorithm is also discussed.展开更多
基金supported by the National Key R&D Program of China (2018YFA0903500)the Max-Planck Partner Group+1 种基金the National Natural Science Foundation of China (22077042)the National Key Research and Development Program of China (2022YFA1206001 to S.G.)。
文摘Polymer conjugation was found highly valuable in clinic to improve the bioavailability of protein therapeutics.However,it is still a tremendous challenge to achieve a complete release of original proteins from the conjugated hybrid under external stimulus to recover active proteins in the targeted tissue.Herein,we report a general light-controlled protein delivery methodology by weaving a photodegradable polymer cocoon around proteins,which could reliably protect them from degradation in the dark while efficiently releasing them under illumination without any residual atoms.The surface charge of the polymer shell is easily tunable to facilitate efficient cell uptake.The versatility of this strategy is demonstrated by the delivery of the Cas9/sg RNA complex that realized light-controlled gene editing both in vitro and in vivo,and such repertoire is of particular value in regard to minimizing the off-target toxicity of CRISPR-Cas9-based gene therapy.
文摘Tea polysaccharide conjugates(TPCs) were water-extracted and purified from low-grade green tea. Although TPC contains 1.97% covalent binding proteins, Coomassie brilliant blue G250 and R250 could not detect this protein. The "should-shape" absorption peak observed at 250-280 nm in the UV-Vis spectrum was caused by quinone compounds derived from polyphenol oxidation during TPC extraction. The UV-Vis spectrum could be used to detect the decolorizing degree of TPC. TPC aqueous solution merely presented the negative charge properties of its polysaccharides instead of the acid-base property of its protein section, and exhibited higher stability at pH greater than 5.0. No precipitation or haze occurred in three TPC/epigallocatechin gallate(EGCG) aqueous mixtures during 12 h storage. TPC had emulsifying activity, which indicated that its protein moiety formed hydrophobic groups. It is proposed that some of the physicochemical properties of the TPC protein moiety are shielded by its polysaccharide chain.
文摘Pneumonia remains the single leading cause of childhood death worldwide.Despite the commercial availability of multiple pneumococcal conjugate vaccines(PCVs),high dosage cost and supply shortages prevent PCV delivery to much of the developing world.The current work presents high-yield pneumococcal conjugates that are immunogenic in animals and suitable for use in human vaccine development.The 13-valent pneumococcal conjugate vaccine(PCV-13)investigated in this research incorporated serotypes 1,3,4,5,6A,6B,7F,9V,14,18C,19A,19F,and 23F.Pneumococcal polysaccharides(PnPSs)and CRM197 carrier protein were produced and purified in-house,and used to prepare PnPS-CRM conjugates using unique,cyanide-free,in vacuo glycation conjugation methods.In vitro characterization confirmed the generation of higher molecular weight PnPS-CRM conjugates low in free protein.In vivo animal studies were performed to compare PnuVax's PCV-13 to the commercially available PCV-13,Prevnar®13(Pfizer,USA).A boost dose was provided to all groups post-dose 1 at t?14 days.Post-dose 2 results at t?28 days showed that all 13 serotypes in PnuVax's PCV-13 were boostable.Per serotype IgG GMCs demonstrated that PnuVax's PCV-13 is immunogenic for all 13 serotypes,with 10 of the 13 serotypes statistically the same or higher than Prevnar®13 post-dose 2.As a result,the novel polysaccharideprotein conjugates developed in this work are highly promising for use in human PCV development.The in vacuo conjugation technique applied in this work could also be readily adapted to develop many other conjugate vaccines.
文摘目的制备A群膜炎球菌多糖(Group A meningococcal polysaccharide,GAMP)-白喉毒素无毒变异体CRM197(Cross-reactive material 197)结合物,并分析其理化性质及免疫学特性。方法白喉棒状杆菌C7 M1菌株经发酵培养表达CRM197,表达产物经DEAE-4FF层析柱进行纯化,纯化产物经SDS-PAGE及Western blot鉴定。用溴化氰(CNBr)活化GAMP,己二酰肼(ADH)为连接剂,在碳二亚胺(EDAC)催化下将GAMP与CRM197共价结合,制备GAMP-ADH-CRM197结合物,经Sepharose 4FF层析柱纯化后,进行各项生化检测,采用免疫双扩散检测结合物的抗原性,将结合物皮下注射ICR小鼠,间接ELISA法检测小鼠血清中抗GAMP的抗体滴度,分析其免疫原性。结果发酵培养20 h时,菌液上清中的CRM197蛋白表达量最高;CRM197以分泌形式表达,纯化后纯度达95%以上,可与白喉类毒素单抗发生特异性反应;GAMP-ADH-CRM197结合物各项生化指标均符合《中国药典》三部(2010版)要求,与A群流脑诊断血清形成明显的沉淀线,结合物诱生的多糖特异性抗体滴度显著高于多糖组和混合物组。结论成功制备了GAMP-ADH-CRM197结合物,其具有良好的抗原性和免疫原性,为以CRM197为蛋白载体制备脑膜炎球菌结合疫苗奠定了基础。
基金The project partially supported by National Key Basic Research Project of China under Grant No. 2004GB318000 and National Natural Science Foundation of China under Grant No. 10471051
文摘We study a three-dimensional off-lattice protein folding model, which involves two species of residues interacting through Lennard-Jones potentials. By incorporating an extra energy contribution into the original potential function, we replace the original constrained problem with an unconstrained minimization of a mixed potential function. As such an efficient quasi-physical algorithm for solving the protein folding problem is presented. We apply the proposed algorithm to sequences with up to 55 residues and compare the computational results with the putative lowest energy found by several of the most famous algorithms, showing the advantages of our method. The dynamic behavior of the quasi-physlcal algorithm is also discussed.