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Xiaolong H Renyu X Guangli C Xing Z Yilin Z Xiaohua Y Yuqing Z Chengliang G 《Molecular biology reports》2012,39(2):1395-1409
To understand mechanisms for the difference of uptaking and transporting the pigments between the male and female in the silkworm,
Bombyx mori strain of sex-related fluorescent cocoon, the fluorescent pigments in the midgut lumen, midgut, blood, silk glands and cocoon
were analyzed with thin-layer chromatography, and showed that fluorescent colors of cocoons consisted with that of blood and
silk glands. The different fluorescent colors of cocoons between the male and female may be mainly caused by the difference
of accumulation and transportation for fluorescent pigments in the midgut and in the silk glands. Furthermore the midgut proteins
were separated with Native-PAGE, and the proteins respectively recovered from three fluorescent regions presenting on a Native-PAGE
gel for the female silkworms were determined using shotgun proteomics and mass spectrometry sequencing, of which 60, 40 and
18 proteins respectively from the region 1, 2 and 3 were identified. It was found that the several kinds of low molecular
mass 30 kDa lipoproteins and the actins could be detected in all three regions, troponin, 30 kDa lipoprotein and 27 kDa glycoprotein
precursor could be detected in the region 2 and 3, suggesting these proteins may be fluorescent pigments binding candidates
proteins. Analysis of gene ontology indicated that the identified proteins in the three regions linked to the cellular component,
molecular function, and biological process categories. These results provide a new clew to understand the formation mechanism
of sex-related fluorescent cocoon of silkworm. 相似文献
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Barbiturates potentiate GABA actions at the GABAA receptor and act as central nervous system depressants that can induce effects ranging from sedation to general anesthesia. No structural information has been available about how barbiturates are recognized by their protein targets. For this reason, we tested whether these drugs were able to bind specifically to horse spleen apoferritin, a model protein that has previously been shown to bind many anesthetic agents with affinities that are closely correlated with anesthetic potency. Thiopental, pentobarbital, and phenobarbital were all found to bind to apoferritin with affinities ranging from 10–500 µM, approximately matching the concentrations required to produce anesthetic and GABAergic responses. X-ray crystal structures were determined for the complexes of apoferritin with thiopental and pentobarbital at resolutions of 1.9 and 2.0 Å, respectively. These structures reveal that the barbiturates bind to a cavity in the apoferritin shell that also binds haloalkanes, halogenated ethers, and propofol. Unlike these other general anesthetics, however, which rely entirely upon van der Waals interactions and the hydrophobic effect for recognition, the barbiturates are recognized in the apoferritin site using a mixture of both polar and nonpolar interactions. These results suggest that any protein binding site that is able to recognize and respond to the chemically and structurally diverse set of compounds used as general anesthetics is likely to include a versatile mixture of both polar and hydrophobic elements. 相似文献
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Xi J Liu R Asbury GR Eckenhoff MF Eckenhoff RG 《The Journal of biological chemistry》2004,279(19):19628-19633
Molecular targets of inhaled anesthetics must be represented in the group that specifically bind these drugs, but the paucity of direct binding data has limited the number of candidates for further evaluation. To find candidate targets, we used a combination of photolabeling, two-dimensional gel electrophoresis, and mass spectrometry to identify halothane-binding targets in rat neuronal membranes. Of the 265 spots detected on the two-dimensional gels, 90 were labeled by [(14)C]halothane, and 34 were identified. Mitochondrial proteins, especially respiratory complex and voltage-dependent anion channels, dominated the labeled group, and there were several examples of subunit- and state-dependent binding. A significant correlation was found between internal protein cavities and binding in a group of proteins with high resolution structures. Therefore, in addition to identifying novel neuronal targets, these data suggest a general molecular feature, the buried cavity, as a dominant attribute of volatile anesthetic-binding sites found in a limited number of neuronal membrane proteins. 相似文献
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非转座子载体介导的稳定转化家蚕BmN细胞表达人粒细胞-巨噬细胞集落刺激因子 总被引:2,自引:0,他引:2
为了建立非转座子载体介导的持续表达外源基因的转化家蚕BmN细胞系,将家蚕核型多角体病毒极早期基因(ie-1)启动子控制的人粒细胞-巨噬细胞集落刺激因子(hGM-CSF)基因的表达盒克隆至pIZT/V5-His,获得重组载体pIZT-IE-hGM-CSF,该载体转染家蚕BmN细胞后,通过博莱霉素(Zeocin)筛选获得了稳定转化细胞系IE-hGM-CSF。转基因细胞基因组经PCR鉴定,成功检测到ie-hGM-CSF,Western blotting分析结果显示转化细胞表达的重组hGM-CSF的大小为22kDa,ELISA检测结果显示hGM-CSF在转化细胞系里的表达水平大约为2814.7pg/106个细胞。 相似文献
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Patterns of genomic variation in Chinese maize inbred lines and implications for genetic improvement 总被引:2,自引:0,他引:2
Renyu Zhang Gen Xu Jiansheng Li Jianbing Yan Huihui Li Xiaohong Yang 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》2018,131(6):1207-1221