目的原核表达链亲和素-补体3d(SA-C3d)融合蛋白,体外探索蛋白活性。方法以C3 c DNA为模板扩增出C3d段DNA,使用一步克隆法将C3d段与酶切后的质粒p ET-24a-6His-SA-IL15相连,获得SA-C3d原核表达质粒。将测序正确的质粒转化入表达感受态大...目的原核表达链亲和素-补体3d(SA-C3d)融合蛋白,体外探索蛋白活性。方法以C3 c DNA为模板扩增出C3d段DNA,使用一步克隆法将C3d段与酶切后的质粒p ET-24a-6His-SA-IL15相连,获得SA-C3d原核表达质粒。将测序正确的质粒转化入表达感受态大肠杆菌Rosetta中,诱导蛋白表达。使用镍柱亲和层析及梯度逐级减低的变性剂脲素透析复性的方法获得目的蛋白。通过锚定生物素化的MB49细胞实验反映SA的功能,通过促进Raji细胞生长的实验检测C3d的功能。结果成功构建SA-C3d原核表达质粒,通过镍柱纯化与透析复性获得高纯度目的蛋白。该蛋白特异性的与生物素化的MB49细胞结合,促进Raji细胞增殖并呈现剂量依赖效应,体现蛋白SA-C3d具有双功能活性。结论成功制备的SA-C3d融合蛋白可在体外与生物素化的MB49细胞结合并促进Raji细胞增殖。展开更多
BACKGROUND Previous publications indicated that genetic predisposition might play important roles in the onset of osteonecrosis of the femoral head(ONFH)in systemic lupus erythematosus(SLE).Some gene loci such as comp...BACKGROUND Previous publications indicated that genetic predisposition might play important roles in the onset of osteonecrosis of the femoral head(ONFH)in systemic lupus erythematosus(SLE).Some gene loci such as complement C3d receptor 2(CR2),nitric oxide synthase 3(NOS3),collagen type II alpha 1 chain(COL2A1),protein tyrosine phosphatase non-receptor type 22(PTPN22),and transient receptor potential cation channel subfamily V member 4(TRPV4)were reported to be involved in this process.AIM To investigate whether the risk of ONFH in SLE is associated with single nucleotide variations(SNVs)in these five genes.METHODS SNVs in the CR2,NOS3,COL2A1,PTPN22,and TRPV4 genes were examined by using FastTarget and Illumina Miseq sequencing technologies in 49 cases of SLE with ONFH.Burrows–wheeler aligner was used to align the sequencing reads to hg19,and GATK and Varscan programs were used to perform SNV calling.PolyPhen-2,SIFT,and MutationTaster were used to assess the functional effects of non-synonymous SNVs.RESULTS Six of the 49 patients were confirmed to have low frequency SNVs,including one patient with SNVs in NOS3(exon 6:c.814G>A:p.E272K and exon 7:c.814G>A:p.E272K.),four in COL2A1(rs41263847:exon 29:c.1913C>T:p.T638I,exon 28:c.1706C>T:p.T569I,and rs371445823:exon 8:c.580G>A:p.A194T,exon 7:c.373G>A:p.A125T),and one in CR2(rs45573035:exon 2:c.200C>G:p.T67S).CONCLUSION The onset of ONFH in SLE might be associated with the identified SNVs in NOS3,COL2A1,and CR2.展开更多
The bimodulus material is a classical model to describe the elastic behavior of materials with tension-compression asymmetry.Due to the inherently nonlinear properties of bimodular materials,traditional iteration meth...The bimodulus material is a classical model to describe the elastic behavior of materials with tension-compression asymmetry.Due to the inherently nonlinear properties of bimodular materials,traditional iteration methods suffer from low convergence efficiency and poor adaptability for large-scale structures in engineering.In this paper,a novel 3D algorithm is established by complementing the three shear moduli of the constitutive equation in principal stress coordinates.In contrast to the existing 3D shear modulus constructed based on experience,in this paper the shear modulus is derived theoretically through a limit process.Then,a theoretically self-consistent complemented algorithm is established and implemented in ABAQUS via UMAT;its good stability and convergence efficiency are verified by using benchmark examples.Numerical analysis shows that the calculation error for bimodulus structures using the traditional linear elastic theory is large,which is not in line with reality.展开更多
文摘目的原核表达链亲和素-补体3d(SA-C3d)融合蛋白,体外探索蛋白活性。方法以C3 c DNA为模板扩增出C3d段DNA,使用一步克隆法将C3d段与酶切后的质粒p ET-24a-6His-SA-IL15相连,获得SA-C3d原核表达质粒。将测序正确的质粒转化入表达感受态大肠杆菌Rosetta中,诱导蛋白表达。使用镍柱亲和层析及梯度逐级减低的变性剂脲素透析复性的方法获得目的蛋白。通过锚定生物素化的MB49细胞实验反映SA的功能,通过促进Raji细胞生长的实验检测C3d的功能。结果成功构建SA-C3d原核表达质粒,通过镍柱纯化与透析复性获得高纯度目的蛋白。该蛋白特异性的与生物素化的MB49细胞结合,促进Raji细胞增殖并呈现剂量依赖效应,体现蛋白SA-C3d具有双功能活性。结论成功制备的SA-C3d融合蛋白可在体外与生物素化的MB49细胞结合并促进Raji细胞增殖。
基金Supported by National Natural Science Foundation of China,No.81671605.
文摘BACKGROUND Previous publications indicated that genetic predisposition might play important roles in the onset of osteonecrosis of the femoral head(ONFH)in systemic lupus erythematosus(SLE).Some gene loci such as complement C3d receptor 2(CR2),nitric oxide synthase 3(NOS3),collagen type II alpha 1 chain(COL2A1),protein tyrosine phosphatase non-receptor type 22(PTPN22),and transient receptor potential cation channel subfamily V member 4(TRPV4)were reported to be involved in this process.AIM To investigate whether the risk of ONFH in SLE is associated with single nucleotide variations(SNVs)in these five genes.METHODS SNVs in the CR2,NOS3,COL2A1,PTPN22,and TRPV4 genes were examined by using FastTarget and Illumina Miseq sequencing technologies in 49 cases of SLE with ONFH.Burrows–wheeler aligner was used to align the sequencing reads to hg19,and GATK and Varscan programs were used to perform SNV calling.PolyPhen-2,SIFT,and MutationTaster were used to assess the functional effects of non-synonymous SNVs.RESULTS Six of the 49 patients were confirmed to have low frequency SNVs,including one patient with SNVs in NOS3(exon 6:c.814G>A:p.E272K and exon 7:c.814G>A:p.E272K.),four in COL2A1(rs41263847:exon 29:c.1913C>T:p.T638I,exon 28:c.1706C>T:p.T569I,and rs371445823:exon 8:c.580G>A:p.A194T,exon 7:c.373G>A:p.A125T),and one in CR2(rs45573035:exon 2:c.200C>G:p.T67S).CONCLUSION The onset of ONFH in SLE might be associated with the identified SNVs in NOS3,COL2A1,and CR2.
基金the National Natural Science Foundation of China(Grant 51908071)Scientific Research Project of Education Department of Hunan Province(Grant 18C0194)Open Fund of Key Laboratory of Road Structure and Material of Ministry of Transport,Changsha University of Science&Technology(Grant kfi 170303).
文摘The bimodulus material is a classical model to describe the elastic behavior of materials with tension-compression asymmetry.Due to the inherently nonlinear properties of bimodular materials,traditional iteration methods suffer from low convergence efficiency and poor adaptability for large-scale structures in engineering.In this paper,a novel 3D algorithm is established by complementing the three shear moduli of the constitutive equation in principal stress coordinates.In contrast to the existing 3D shear modulus constructed based on experience,in this paper the shear modulus is derived theoretically through a limit process.Then,a theoretically self-consistent complemented algorithm is established and implemented in ABAQUS via UMAT;its good stability and convergence efficiency are verified by using benchmark examples.Numerical analysis shows that the calculation error for bimodulus structures using the traditional linear elastic theory is large,which is not in line with reality.
