Neurofilaments (NFs) are neuron-specific intermediate filaments. The NFs were isolated from bovine spinal cord by differential centrifugation. The NFs were detected with electron microscopy and scanning tunneling micr...Neurofilaments (NFs) are neuron-specific intermediate filaments. The NFs were isolated from bovine spinal cord by differential centrifugation. The NFs were detected with electron microscopy and scanning tunneling microscopy (STM) . Under STM, two kinds of sidearm of NFs were revealed: one was short, the other was long. They were arrayed along the 10-nm width core filaments one by one. The intervals between two adjacent long sidearms or two short sidearms were 20-22 nm, while those between two adjacent long and short sidearms were 10-ll nm. It was proposed that the rod domain of NF triplet proteins was 3/4-staggered. The assembly properties of NT triplet proteins were also studied. Immuno-colloidal-gold labeling assay showed that NF-M and NF-H are able to co-assemble into long filaments with NF-L. NF-M and NF-H can also co-constitute into winding filaments.展开更多
目的:探讨全反式维甲酸对SH I-1细胞株中糖基转移酶表达的影响。方法:采用半定量RT-PCR和Real-Tim e PCR方法,比较在不同浓度ATRA作用下,SH I-1细胞中不同糖基转移酶家族(多肽:N-乙酰氨基半乳糖转移酶家族、β3N-乙酰氨基葡萄糖基转移...目的:探讨全反式维甲酸对SH I-1细胞株中糖基转移酶表达的影响。方法:采用半定量RT-PCR和Real-Tim e PCR方法,比较在不同浓度ATRA作用下,SH I-1细胞中不同糖基转移酶家族(多肽:N-乙酰氨基半乳糖转移酶家族、β3N-乙酰氨基葡萄糖基转移酶家族和O-连接N-乙酰氨基葡萄糖转移酶家族)的表达情况。结果:在SH I-1细胞株中ppGalNAcT1、T2、T3、T4,β3GnT1、β3GnT5,O-GnT有不同程度的表达,加入全反式维甲酸后β3GnT5表达量下降,pp-GalNAcT2、T4、β3GnT1、O-GnT表达量升高。结论:加入诱导分化剂全反式维甲酸后,SHI-1细胞中的糖基化作用升高。展开更多
Introduction Single nucleotide polymorphisms （SNPs） are the most abundant DNA markers in the human genome occurring at a frequency of one in every 500--1000 nucleotides. A variety of methods have been used for the ...Introduction Single nucleotide polymorphisms （SNPs） are the most abundant DNA markers in the human genome occurring at a frequency of one in every 500--1000 nucleotides. A variety of methods have been used for the analysis of single nucleotide polymorphisms, including restriction fragment length polymorphism （RFLP）, direct sequencing by using laser-induced fluorescence detectionTM, fluorescence energy transfer, MALDI-TOF MS combined with primer extension or invasive cleavage, and fluorescence polarization. During the past two decades, mass spectrometry has become a very popular tool in the analysis of biomolecules and is perfectly suited to the analysis of single nucleotide polymorphisms （SNPs） due to its speed, low cost, and accuracy. In this work, we used MALDI TOF mass spectrometry to detect the fragments of restriction endonuclease hydrolysis of PCR products flanking a SNP located at paraoxonase 1（Q192R）. Compared with electrophoresis, this method requires less time of analysis and possess a higher accuracy.展开更多
基金Project supported by the Doetor Foundation of Ministry of Education of China.
文摘Neurofilaments (NFs) are neuron-specific intermediate filaments. The NFs were isolated from bovine spinal cord by differential centrifugation. The NFs were detected with electron microscopy and scanning tunneling microscopy (STM) . Under STM, two kinds of sidearm of NFs were revealed: one was short, the other was long. They were arrayed along the 10-nm width core filaments one by one. The intervals between two adjacent long sidearms or two short sidearms were 20-22 nm, while those between two adjacent long and short sidearms were 10-ll nm. It was proposed that the rod domain of NF triplet proteins was 3/4-staggered. The assembly properties of NT triplet proteins were also studied. Immuno-colloidal-gold labeling assay showed that NF-M and NF-H are able to co-assemble into long filaments with NF-L. NF-M and NF-H can also co-constitute into winding filaments.
文摘Introduction Single nucleotide polymorphisms （SNPs） are the most abundant DNA markers in the human genome occurring at a frequency of one in every 500--1000 nucleotides. A variety of methods have been used for the analysis of single nucleotide polymorphisms, including restriction fragment length polymorphism （RFLP）, direct sequencing by using laser-induced fluorescence detectionTM, fluorescence energy transfer, MALDI-TOF MS combined with primer extension or invasive cleavage, and fluorescence polarization. During the past two decades, mass spectrometry has become a very popular tool in the analysis of biomolecules and is perfectly suited to the analysis of single nucleotide polymorphisms （SNPs） due to its speed, low cost, and accuracy. In this work, we used MALDI TOF mass spectrometry to detect the fragments of restriction endonuclease hydrolysis of PCR products flanking a SNP located at paraoxonase 1（Q192R）. Compared with electrophoresis, this method requires less time of analysis and possess a higher accuracy.
