[Objective] This study aimed to investigate the outer membrane protein （OMP） patterns of Escherichia coli 038, 053 and 075 isolates from chickens. [Method] Eight pathogenic E. coil isolates with various serotypes we...[Objective] This study aimed to investigate the outer membrane protein （OMP） patterns of Escherichia coli 038, 053 and 075 isolates from chickens. [Method] Eight pathogenic E. coil isolates with various serotypes were used as experimental materials to extract OMP by using supersonic schizolysis method and Sarcosyl. After SDS-PAGE electrophoresis, OMP patterns of the extracted products were determined based on the OMP model diagram. [Result] OMP of eight E. coil isolates with three serotypes were divided into three patterns, to be specific, 2 075 isolates respectively belonged to OMP-I and OMP-II pattern, 1 053 isolate belonged to OMP-II pattern, and 5 038 isolates belonged to OMP-I and OMP-III pattern. [Conclusion] Experimental results showed that E. coli isolates with the same serotype may belong to completely different OMP patterns, while serologically unrelated isolates may belong to the same OMP pattern. OMP of E. coil isolates with the same serotype may generate genetic differentiation; in addition, OMP of E. coli isolates with different serotypes may have different genetic correlation.展开更多
Protein has been widely used for fabricating patterned structures since it is one of the most important macromolecules in living organisms,and protein patterns possess potential applications in many fields such as med...Protein has been widely used for fabricating patterned structures since it is one of the most important macromolecules in living organisms,and protein patterns possess potential applications in many fields such as medical diagnosis,tissue engineering,biosensors,and medical screening.At present,there are two fashions to fabricate protein patterns:one is grafting the protein to the microstructure which is prepared by micro-fabrication techniques;the other one is achieving the patterned protein structures directly.Here we provide an overview on current status of the fabrication techniques and the applications of the protein patterns,and then give an outlook on the development of the fabrication techniques and the prospective applications of the protein patterns in future research.展开更多
Homogenates prepared from S. japonicum adult worms ofdifferent isolates from Anhui, Hubei, Guangxi, Yunnan andSichuan Provinces were analyzed by SDS-PAGE and enzymelinked immunoelectrotransfer blot (EITB) tested with ...Homogenates prepared from S. japonicum adult worms ofdifferent isolates from Anhui, Hubei, Guangxi, Yunnan andSichuan Provinces were analyzed by SDS-PAGE and enzymelinked immunoelectrotransfer blot (EITB) tested with rabbitanti-snails antibody. The results of SDS-PAGE indicated thatwith silver staining both male and female worms of Guangxiisolate showed some definite differences in their protein profile,namely, absence of one band between 50-75 kDa in maleworms and marked reduction in quantity of > 110 and 30 kDabands in female worms. There was no obvious differenceamong other isolates both in male and female worms. TheEITB patterns were similar in S. japonicum of Anhui andHubei, and it was also the case with isolates from Yunnan andSichuau, except that Yuunan female worms had a distinct band展开更多
Background The cellular repressor of ElA-stimulated genes(CREG) is a secreted glycoprotein that inhibits cell proliferation and/or enhances differentiation.CREG is widely expressed in adult tissues such as the brain,h...Background The cellular repressor of ElA-stimulated genes(CREG) is a secreted glycoprotein that inhibits cell proliferation and/or enhances differentiation.CREG is widely expressed in adult tissues such as the brain,heart, lungs,liver,intestines and kidneys in mice.We investigated the level of CREG expression during mouse embryogenesis and its distribution at 18.5 days post coitus(dpc).Methods Immunohistochemical staining with diaminobenzidine,western blotting and reverse transcription-polymerase chain reaction were used.Results CREG expression was rst detected in mouse embryos at 4.5 dpc.It was expressed at almost all stages up to 18.5 dpc.The level of CREG was found to increase gradually and was highest at 18.5 dpc.Western blotting showed that the CREG protein was expressed at higher levels in the brain,heart,intestines and kidneys than in the lungs and liver at 18.5 dpc.In 9.5 dpc embryos,CREG was expressed only in the endothelial cells of blood vessels,after the vascular lumen had formed.With advanced differentiation, vascular smooth muscle cells developed in the embryonic vascular structures;the expression of smooth muscle a-actin protein and CREG were positive and increased gradually in 10.5 dpc embryonic vessels.CREG expression in the embryonic blood vessels peaked at 15.5 dpc and was reduced slightly at 18.5 dpc.Conclusions These results indicate that CREG is expressed during mouse embryogenesis and might participate in the differentiation of these organs during embryogenesis.展开更多
Posidonia oceanicameadows are experiencing a progressive decline, and monitoring their status is crucial for the maintenance of theseecosystems. We performed a comparativeanalysis of bed density, total phenol content ...Posidonia oceanicameadows are experiencing a progressive decline, and monitoring their status is crucial for the maintenance of theseecosystems. We performed a comparativeanalysis of bed density, total phenol content and protein expression pattern to assess the conservation status ofPosidoniaplants from the S. Marinella (Rome, Italy) meadow. The total phenol content was inversely related to maximum beddensity, confirming the relationship betweenhigh phenol content and stressful conditions. In addition, protein expression pattern profilesshowed that the number of differentially expressed proteins was dramatically reduced in the latest years compared to previous analyses. Our results support the usefulness of integrating solid descriptors, such as phenol content, with novel biochemical/molecular approaches in the monitoring of meadows.展开更多
The effect of the different training samples is different for the classifier when pattern recognition system is established. The training samples were selected randomly in the past protein disulfide bond prediction me...The effect of the different training samples is different for the classifier when pattern recognition system is established. The training samples were selected randomly in the past protein disulfide bond prediction methods, therefore the prediction accuracy of protein contact was reduced. In order to improve the influence of training samples, a prediction method of protein disulfide bond on the basis of pattern selection and Radical Basis Function neural network has been brought forward in this paper. The attributes related with protein disulfide bond are extracted and coded in the method and pattern selection is used to select training samples from coded samples in order to improve the precision of protein disulfide bond prediction. 200 proteins with disulfide bond structure from the PDB database are encoded according to the encoding approach and are taken as models of training samples. Then samples are taken on the pattern selection based on the nearest neighbor algorithm and corresponding prediction models are set by using RBF neural network. The simulation experiment result indicates that this method of pattern selection can improve the prediction accuracy of protein disulfide bond.展开更多
【目的】挖掘参与油茶糖代谢及逆境响应的糖外排转运子(sugars will eventually be exported transporters,SWEETs)。【方法】利用生物信息学方法分析油茶SWEETs家族的基因结构、蛋白基序、染色体定位、共线性关系、启动子区顺式作用元...【目的】挖掘参与油茶糖代谢及逆境响应的糖外排转运子(sugars will eventually be exported transporters,SWEETs)。【方法】利用生物信息学方法分析油茶SWEETs家族的基因结构、蛋白基序、染色体定位、共线性关系、启动子区顺式作用元件及上游调控因子等,并利用RT-qPCR分析CoSWEETs在不同时期、不同组织及不同逆境胁迫下的基因表达情况。【结果】从油茶中鉴定得到14个CoSWEETs基因,不均匀分布于10条染色体上,不同成员间内含子-外显子数目存在差异。根据系统进化关系,14个CoSWEETs可分为 4个分支,均具有1-2个MtN3 保守结构域,同一分支具有相似的基因结构和基序。根据启动子顺式作用元件和上游转录因子预测的分析结果,CoSWEETs启动子中含有多个与生长发育、植物激素和应激相关的调节元件,其表达可能受到ERF、DOF、BBR-BPC、MYB等转录因子的调控。RT-qPCR分析表明大部分CoSWEETs成员在果实和根中高表达,在种子中的表达水平与发育时期相关,并根据低温、高盐和干旱等非生物胁迫下CoSWEETs的表达模式挖掘出CoSWEET1、CoSWEET2、CoSWEET17等响应油茶低温、干旱或高盐胁迫的基因。【结论】CoSWEET基因的表达受到多种激素及转录因子调控,并在油茶种子发育与逆境胁迫响应中发挥重要作用。展开更多
Striped bone morphogenetic protein-2 （BMP-2） patterns are created on polystyrene （PS） surfaces by microcontact printing （μCP） to investigate the influences of the protein patterns on bovine chondrocytes behavio...Striped bone morphogenetic protein-2 （BMP-2） patterns are created on polystyrene （PS） surfaces by microcontact printing （μCP） to investigate the influences of the protein patterns on bovine chondrocytes behaviors. Due to the excellent ability of BMP-2 to recruit cells and the limited ability of blank PS areas to bind ceils, bovine chondrocytes preferentially attach on the protein areas, leading to formation of cell patterns and elongated cell morphologies to some degree. The BMP-2 protein stripe can guide bovine chondrocytes adhesion and alignment. The pattern dimensions can significantly affect the cell adhesion and spread. The protein stripe width mainly controls the cell elongation and orientation while the pattern spacing mainly affects the cell spread towards neighboring stripes. Therefore, the cell morphology and distribution direction can be controlled by precisely designing the pattern shapes and sizes. We believe that the present study could fred applications for surface modification of biomaterials＇ surfaces to create the bioactive patterns to control chondrocytes adhesion, spreading and even cell function. It may be helpful for the development of novel biomaterials for cartilage repair.展开更多
This is a brief account of the plenary talk given to the meeting of the Chinese Society of Chemical Science and Technology held in Oxford on 6 October 2001. The talk covered the application of pattern recognition tech...This is a brief account of the plenary talk given to the meeting of the Chinese Society of Chemical Science and Technology held in Oxford on 6 October 2001. The talk covered the application of pattern recognition techniques to discover molecules which will bind to the binding sites of proteins. Three situations were considered: the structure of the protein being unknown; the structure known but the binding site unknown; and finally, and this is the most important case for the future, both the structure and nature of the target site available in atomic detail. For this case we have developed a massively distributed computer program using a screensaver which now involves over one million personal computers, including over a thousand in China. The project will involve the screening of 3 5 billion small molecules against 16 protein targets, all of which are implicated in the process of cancer.展开更多
基金Supported by China Postdoctoral Science Foundation(20100470565)Science and Technology Support Program of Hebei Province(10960408D)+1 种基金Project of Science and technology Bureau of Shijiazhuang(1150093A)Science and Technology Development Project of Qinhuangdao City(201101A182)~~
文摘[Objective] This study aimed to investigate the outer membrane protein （OMP） patterns of Escherichia coli 038, 053 and 075 isolates from chickens. [Method] Eight pathogenic E. coil isolates with various serotypes were used as experimental materials to extract OMP by using supersonic schizolysis method and Sarcosyl. After SDS-PAGE electrophoresis, OMP patterns of the extracted products were determined based on the OMP model diagram. [Result] OMP of eight E. coil isolates with three serotypes were divided into three patterns, to be specific, 2 075 isolates respectively belonged to OMP-I and OMP-II pattern, 1 053 isolate belonged to OMP-II pattern, and 5 038 isolates belonged to OMP-I and OMP-III pattern. [Conclusion] Experimental results showed that E. coli isolates with the same serotype may belong to completely different OMP patterns, while serologically unrelated isolates may belong to the same OMP pattern. OMP of E. coil isolates with the same serotype may generate genetic differentiation; in addition, OMP of E. coli isolates with different serotypes may have different genetic correlation.
基金financially supported by the National Natural Science Foundation of China (21221063,91123031)National Basic Research Program of China (973 project,2012C13933800)
文摘Protein has been widely used for fabricating patterned structures since it is one of the most important macromolecules in living organisms,and protein patterns possess potential applications in many fields such as medical diagnosis,tissue engineering,biosensors,and medical screening.At present,there are two fashions to fabricate protein patterns:one is grafting the protein to the microstructure which is prepared by micro-fabrication techniques;the other one is achieving the patterned protein structures directly.Here we provide an overview on current status of the fabrication techniques and the applications of the protein patterns,and then give an outlook on the development of the fabrication techniques and the prospective applications of the protein patterns in future research.
基金This project was supported by the National Natural Science Foundation of China
文摘Homogenates prepared from S. japonicum adult worms ofdifferent isolates from Anhui, Hubei, Guangxi, Yunnan andSichuan Provinces were analyzed by SDS-PAGE and enzymelinked immunoelectrotransfer blot (EITB) tested with rabbitanti-snails antibody. The results of SDS-PAGE indicated thatwith silver staining both male and female worms of Guangxiisolate showed some definite differences in their protein profile,namely, absence of one band between 50-75 kDa in maleworms and marked reduction in quantity of > 110 and 30 kDabands in female worms. There was no obvious differenceamong other isolates both in male and female worms. TheEITB patterns were similar in S. japonicum of Anhui andHubei, and it was also the case with isolates from Yunnan andSichuau, except that Yuunan female worms had a distinct band
文摘Background The cellular repressor of ElA-stimulated genes(CREG) is a secreted glycoprotein that inhibits cell proliferation and/or enhances differentiation.CREG is widely expressed in adult tissues such as the brain,heart, lungs,liver,intestines and kidneys in mice.We investigated the level of CREG expression during mouse embryogenesis and its distribution at 18.5 days post coitus(dpc).Methods Immunohistochemical staining with diaminobenzidine,western blotting and reverse transcription-polymerase chain reaction were used.Results CREG expression was rst detected in mouse embryos at 4.5 dpc.It was expressed at almost all stages up to 18.5 dpc.The level of CREG was found to increase gradually and was highest at 18.5 dpc.Western blotting showed that the CREG protein was expressed at higher levels in the brain,heart,intestines and kidneys than in the lungs and liver at 18.5 dpc.In 9.5 dpc embryos,CREG was expressed only in the endothelial cells of blood vessels,after the vascular lumen had formed.With advanced differentiation, vascular smooth muscle cells developed in the embryonic vascular structures;the expression of smooth muscle a-actin protein and CREG were positive and increased gradually in 10.5 dpc embryonic vessels.CREG expression in the embryonic blood vessels peaked at 15.5 dpc and was reduced slightly at 18.5 dpc.Conclusions These results indicate that CREG is expressed during mouse embryogenesis and might participate in the differentiation of these organs during embryogenesis.
文摘Posidonia oceanicameadows are experiencing a progressive decline, and monitoring their status is crucial for the maintenance of theseecosystems. We performed a comparativeanalysis of bed density, total phenol content and protein expression pattern to assess the conservation status ofPosidoniaplants from the S. Marinella (Rome, Italy) meadow. The total phenol content was inversely related to maximum beddensity, confirming the relationship betweenhigh phenol content and stressful conditions. In addition, protein expression pattern profilesshowed that the number of differentially expressed proteins was dramatically reduced in the latest years compared to previous analyses. Our results support the usefulness of integrating solid descriptors, such as phenol content, with novel biochemical/molecular approaches in the monitoring of meadows.
文摘The effect of the different training samples is different for the classifier when pattern recognition system is established. The training samples were selected randomly in the past protein disulfide bond prediction methods, therefore the prediction accuracy of protein contact was reduced. In order to improve the influence of training samples, a prediction method of protein disulfide bond on the basis of pattern selection and Radical Basis Function neural network has been brought forward in this paper. The attributes related with protein disulfide bond are extracted and coded in the method and pattern selection is used to select training samples from coded samples in order to improve the precision of protein disulfide bond prediction. 200 proteins with disulfide bond structure from the PDB database are encoded according to the encoding approach and are taken as models of training samples. Then samples are taken on the pattern selection based on the nearest neighbor algorithm and corresponding prediction models are set by using RBF neural network. The simulation experiment result indicates that this method of pattern selection can improve the prediction accuracy of protein disulfide bond.
文摘【目的】挖掘参与油茶糖代谢及逆境响应的糖外排转运子(sugars will eventually be exported transporters,SWEETs)。【方法】利用生物信息学方法分析油茶SWEETs家族的基因结构、蛋白基序、染色体定位、共线性关系、启动子区顺式作用元件及上游调控因子等,并利用RT-qPCR分析CoSWEETs在不同时期、不同组织及不同逆境胁迫下的基因表达情况。【结果】从油茶中鉴定得到14个CoSWEETs基因,不均匀分布于10条染色体上,不同成员间内含子-外显子数目存在差异。根据系统进化关系,14个CoSWEETs可分为 4个分支,均具有1-2个MtN3 保守结构域,同一分支具有相似的基因结构和基序。根据启动子顺式作用元件和上游转录因子预测的分析结果,CoSWEETs启动子中含有多个与生长发育、植物激素和应激相关的调节元件,其表达可能受到ERF、DOF、BBR-BPC、MYB等转录因子的调控。RT-qPCR分析表明大部分CoSWEETs成员在果实和根中高表达,在种子中的表达水平与发育时期相关,并根据低温、高盐和干旱等非生物胁迫下CoSWEETs的表达模式挖掘出CoSWEET1、CoSWEET2、CoSWEET17等响应油茶低温、干旱或高盐胁迫的基因。【结论】CoSWEET基因的表达受到多种激素及转录因子调控,并在油茶种子发育与逆境胁迫响应中发挥重要作用。
基金Funded by Jiangsu Qing Lan Project,the National Natural Science Foundation of China(No.31470926)the Scientific Research Foundation for Returned Scholars(No.2010-1561)the Foundation of Jiangsu Provincial Key Laboratory for Interventional Medical Devices(No.jr1202)
文摘Striped bone morphogenetic protein-2 （BMP-2） patterns are created on polystyrene （PS） surfaces by microcontact printing （μCP） to investigate the influences of the protein patterns on bovine chondrocytes behaviors. Due to the excellent ability of BMP-2 to recruit cells and the limited ability of blank PS areas to bind ceils, bovine chondrocytes preferentially attach on the protein areas, leading to formation of cell patterns and elongated cell morphologies to some degree. The BMP-2 protein stripe can guide bovine chondrocytes adhesion and alignment. The pattern dimensions can significantly affect the cell adhesion and spread. The protein stripe width mainly controls the cell elongation and orientation while the pattern spacing mainly affects the cell spread towards neighboring stripes. Therefore, the cell morphology and distribution direction can be controlled by precisely designing the pattern shapes and sizes. We believe that the present study could fred applications for surface modification of biomaterials＇ surfaces to create the bioactive patterns to control chondrocytes adhesion, spreading and even cell function. It may be helpful for the development of novel biomaterials for cartilage repair.
文摘This is a brief account of the plenary talk given to the meeting of the Chinese Society of Chemical Science and Technology held in Oxford on 6 October 2001. The talk covered the application of pattern recognition techniques to discover molecules which will bind to the binding sites of proteins. Three situations were considered: the structure of the protein being unknown; the structure known but the binding site unknown; and finally, and this is the most important case for the future, both the structure and nature of the target site available in atomic detail. For this case we have developed a massively distributed computer program using a screensaver which now involves over one million personal computers, including over a thousand in China. The project will involve the screening of 3 5 billion small molecules against 16 protein targets, all of which are implicated in the process of cancer.
