Loquat(Eriobotrya japonica Lindl.),a rare fruit native to China,has a long history of cultivation in China.Low temperature is the key factor restricting loquat growth and severely affects yield.Low temperature induces...Loquat(Eriobotrya japonica Lindl.),a rare fruit native to China,has a long history of cultivation in China.Low temperature is the key factor restricting loquat growth and severely affects yield.Low temperature induces the regeneration and metabolism of reduced glutathione(GSH)to alleviate stress damage via the participation of glu-tathione S-transferases(GSTs)in plants.In this study,16 GSTs were identified from the loquat genome according to their protein sequence similarity with Arabidopsis GSTs.On the basis of domain characteristics and phyloge-netic analysis of AtGSTs,these EjGSTs can be divided into 4 subclasses:Phi,Theta,Tau and Zeta.The basic prop-erties,subcellular localization,structures,motifs,chromosomal distribution and collinearity of the EjGST proteins or genes were further analyzed.Tandem and segmental gene duplications play pivotal roles in EjGST expansion.Cis-elements that respond to various hormones and stresses,especially those associated with low-temperature responsiveness,were predicted to be present in the promoters of EjGSTs.Moreover,analysis of gene expression profiles revealed that 9 of 16 EjGSTs may be involved in the low-temperature responsiveness of loquat leaves.In agriculture,5-aminolevulinic acid(ALA),a potential multifunctional plant growth regulator,can improve the stress response of plants.Among the 9 low-temperature-responsive EjGSTs,the expression of EjGSTU1 and EjGSTF1 significantly differed under cold stress in response to exogenous 5-aminolevulinic acid(ALA)pretreat-ment.The remarkable increase in GST activity and GSH/GSSG ratio reflected the increase in the cold response ability of loquat plants caused by exogenous ALA,thereby alleviating H2O2 accumulation and membrane lipid preoxidation.Overall,this study provides an initial exploration of the cold tolerance function of GSTs in loquat,offering a theoretical foundation for the development of cold-resistant loquat cultivars and new antifreeze agents.展开更多
The SWEET(sugar will eventually be exported transporter)family proteins are a recently identified class of sugar transporters that are essential for various physiological processes.Although the functions of the SWEET p...The SWEET(sugar will eventually be exported transporter)family proteins are a recently identified class of sugar transporters that are essential for various physiological processes.Although the functions of the SWEET proteins have been identified in a number of species,to date,there have been no reports of the functions of the SWEET genes in woodland strawberries(Fragaria vesca).In this study,we identified 15 genes that were highly homolo-gous to the A.thaliana AtSWEET genes and designated them as FvSWEET1–FvSWEET15.We then conducted a structural and evolutionary analysis of these 15 FvSWEET genes.The phylogenetic analysis enabled us to categor-ize the predicted 15 SWEET proteins into four distinct groups.We observed slight variations in the exon‒intron structures of these genes,while the motifs and domain structures remained highly conserved.Additionally,the developmental and biological stress expression profiles of the 15 FvSWEET genes were extracted and analyzed.Finally,WGCNA coexpression network analysis was run to search for possible interacting genes of FvSWEET genes.The results showed that the FvSWEET10 genes interacted with 20 other genes,playing roles in response to bacterial and fungal infections.The outcomes of this study provide insights into the further study of FvSWEET genes and may also aid in the functional characterization of the FvSWEET genes in woodland strawberries.展开更多
To investigate the mechanisms of microwave induced pacemaker cell injuries, Wistar rats and the primary pacemaker cells of newborn Wistar rats were exposed to microwave at average power density of 50 mW/cm2. Slower sp...To investigate the mechanisms of microwave induced pacemaker cell injuries, Wistar rats and the primary pacemaker cells of newborn Wistar rats were exposed to microwave at average power density of 50 mW/cm2. Slower spontaneous beating rate, intercellular Ca2+ aggregation and cell membrane perforation were detected immediately after the exposure. Moreover, hyperpolarizationactivated cyclic nucleotide-gated cation channel 4 (HCN4) was down-regulated immediately after the exposure and up-regulated at 12 h after the exposure. In the sinoatrial node (SAN) of the rats,展开更多
Factor Ⅷ deficiency or hemophilia A is X-linkedgenetic disorder in human. General treatment of severehemophilia A consists of adiministration of plasma-derived or recombinant clotting factor concentrates. Ithas cause...Factor Ⅷ deficiency or hemophilia A is X-linkedgenetic disorder in human. General treatment of severehemophilia A consists of adiministration of plasma-derived or recombinant clotting factor concentrates. Ithas caused a series of problems, i. e. viral infection andcost too much to use rF Ⅷ. Nowadays, people havedeveloped the retroviral vector and the adcnoviral展开更多
目的改良人源杀菌肽LL-37的氨基酸序列,提高其杀菌力,并在原核细菌中表达。方法应用蛋白质分析软件(Anthepro5.0、SWISS-MODEL等),对人源杀菌肽LL-37的氨基酸序列进行二维、三维结构及理化特性分析,将其中部分氨基酸残基进行替换,提高...目的改良人源杀菌肽LL-37的氨基酸序列,提高其杀菌力,并在原核细菌中表达。方法应用蛋白质分析软件(Anthepro5.0、SWISS-MODEL等),对人源杀菌肽LL-37的氨基酸序列进行二维、三维结构及理化特性分析,将其中部分氨基酸残基进行替换,提高其正电荷,并以人源杀菌肽LL-37的基因序列为模板,进行相应的DNA序列替换,转入表达载体pET-28a(+)于杆菌BL21(DE3)中表达、纯化,并初步研究其抗菌性。结果在维持LL-37空间构象不变的基础上,将Glu16、Asp26、Glu36分别替换为Gln16、Asn26、Gln36,其静电荷由pH7.4时的+5.8提高到+9.0,并且其多肽N端疏水、C端亲水的特性不变。通过Touch-Down PCR法,成功获得改良LL-37多肽的DNA序列,并将重组质粒pET-28a(+)-rLL-37在杆菌BL21(DE3)中表达,改良LL-37多肽成功由强离子交换柱芯Macro-Prep High S纯化,并对G+、G-菌具有一定的抗菌力。结论将杀菌肽LL-37多肽进行氨基酸残基替换并以原核细胞进行融合型表达是可行的,为改良LL-37的大量制备及杀菌活性研究奠定了基础。展开更多
基金This research was funded by grants from the Fujian Provincial Science and Technology Project(2021N5014,2022N5006)the Science and Technology Plan Project of Putian(2023GJGZ001).
文摘Loquat(Eriobotrya japonica Lindl.),a rare fruit native to China,has a long history of cultivation in China.Low temperature is the key factor restricting loquat growth and severely affects yield.Low temperature induces the regeneration and metabolism of reduced glutathione(GSH)to alleviate stress damage via the participation of glu-tathione S-transferases(GSTs)in plants.In this study,16 GSTs were identified from the loquat genome according to their protein sequence similarity with Arabidopsis GSTs.On the basis of domain characteristics and phyloge-netic analysis of AtGSTs,these EjGSTs can be divided into 4 subclasses:Phi,Theta,Tau and Zeta.The basic prop-erties,subcellular localization,structures,motifs,chromosomal distribution and collinearity of the EjGST proteins or genes were further analyzed.Tandem and segmental gene duplications play pivotal roles in EjGST expansion.Cis-elements that respond to various hormones and stresses,especially those associated with low-temperature responsiveness,were predicted to be present in the promoters of EjGSTs.Moreover,analysis of gene expression profiles revealed that 9 of 16 EjGSTs may be involved in the low-temperature responsiveness of loquat leaves.In agriculture,5-aminolevulinic acid(ALA),a potential multifunctional plant growth regulator,can improve the stress response of plants.Among the 9 low-temperature-responsive EjGSTs,the expression of EjGSTU1 and EjGSTF1 significantly differed under cold stress in response to exogenous 5-aminolevulinic acid(ALA)pretreat-ment.The remarkable increase in GST activity and GSH/GSSG ratio reflected the increase in the cold response ability of loquat plants caused by exogenous ALA,thereby alleviating H2O2 accumulation and membrane lipid preoxidation.Overall,this study provides an initial exploration of the cold tolerance function of GSTs in loquat,offering a theoretical foundation for the development of cold-resistant loquat cultivars and new antifreeze agents.
基金funded by the Fujian Provincial Science and Technology Project(2021N5014,2022N5006)the Key Research Project of the Putian Science and Technology Bureau(2021ZP08,2021ZP09,2021ZP10,2021ZP11,2023GJGZ001).
文摘The SWEET(sugar will eventually be exported transporter)family proteins are a recently identified class of sugar transporters that are essential for various physiological processes.Although the functions of the SWEET proteins have been identified in a number of species,to date,there have been no reports of the functions of the SWEET genes in woodland strawberries(Fragaria vesca).In this study,we identified 15 genes that were highly homolo-gous to the A.thaliana AtSWEET genes and designated them as FvSWEET1–FvSWEET15.We then conducted a structural and evolutionary analysis of these 15 FvSWEET genes.The phylogenetic analysis enabled us to categor-ize the predicted 15 SWEET proteins into four distinct groups.We observed slight variations in the exon‒intron structures of these genes,while the motifs and domain structures remained highly conserved.Additionally,the developmental and biological stress expression profiles of the 15 FvSWEET genes were extracted and analyzed.Finally,WGCNA coexpression network analysis was run to search for possible interacting genes of FvSWEET genes.The results showed that the FvSWEET10 genes interacted with 20 other genes,playing roles in response to bacterial and fungal infections.The outcomes of this study provide insights into the further study of FvSWEET genes and may also aid in the functional characterization of the FvSWEET genes in woodland strawberries.
文摘To investigate the mechanisms of microwave induced pacemaker cell injuries, Wistar rats and the primary pacemaker cells of newborn Wistar rats were exposed to microwave at average power density of 50 mW/cm2. Slower spontaneous beating rate, intercellular Ca2+ aggregation and cell membrane perforation were detected immediately after the exposure. Moreover, hyperpolarizationactivated cyclic nucleotide-gated cation channel 4 (HCN4) was down-regulated immediately after the exposure and up-regulated at 12 h after the exposure. In the sinoatrial node (SAN) of the rats,
文摘Factor Ⅷ deficiency or hemophilia A is X-linkedgenetic disorder in human. General treatment of severehemophilia A consists of adiministration of plasma-derived or recombinant clotting factor concentrates. Ithas caused a series of problems, i. e. viral infection andcost too much to use rF Ⅷ. Nowadays, people havedeveloped the retroviral vector and the adcnoviral
文摘目的改良人源杀菌肽LL-37的氨基酸序列,提高其杀菌力,并在原核细菌中表达。方法应用蛋白质分析软件(Anthepro5.0、SWISS-MODEL等),对人源杀菌肽LL-37的氨基酸序列进行二维、三维结构及理化特性分析,将其中部分氨基酸残基进行替换,提高其正电荷,并以人源杀菌肽LL-37的基因序列为模板,进行相应的DNA序列替换,转入表达载体pET-28a(+)于杆菌BL21(DE3)中表达、纯化,并初步研究其抗菌性。结果在维持LL-37空间构象不变的基础上,将Glu16、Asp26、Glu36分别替换为Gln16、Asn26、Gln36,其静电荷由pH7.4时的+5.8提高到+9.0,并且其多肽N端疏水、C端亲水的特性不变。通过Touch-Down PCR法,成功获得改良LL-37多肽的DNA序列,并将重组质粒pET-28a(+)-rLL-37在杆菌BL21(DE3)中表达,改良LL-37多肽成功由强离子交换柱芯Macro-Prep High S纯化,并对G+、G-菌具有一定的抗菌力。结论将杀菌肽LL-37多肽进行氨基酸残基替换并以原核细胞进行融合型表达是可行的,为改良LL-37的大量制备及杀菌活性研究奠定了基础。