膜蛋白质通过与其他蛋白质相互作用形成膜蛋白质复合物(Membrane protein complexes,MPCs)形式来行使重要的生物学功能,譬如参与细胞-细胞交流、信号传导与分子识别等。MPCs的功能异常会导致多种疾病的发生和临床治疗耐药等问题。研究完...膜蛋白质通过与其他蛋白质相互作用形成膜蛋白质复合物(Membrane protein complexes,MPCs)形式来行使重要的生物学功能,譬如参与细胞-细胞交流、信号传导与分子识别等。MPCs的功能异常会导致多种疾病的发生和临床治疗耐药等问题。研究完整MPCs的组装对于绘制全景式蛋白质-蛋白质相互作用网络,进而揭示膜蛋白质机器的功能具有重要意义。然而,由于MPCs的过表达和纯化仍面临巨大挑战,如何从细胞中实现MPCs的高效提取尤为重要。因此,亟需发展既可确保MPCs提取效率,并能保持其结构稳定性的提取方法。该文对现有MPCs提取方法及其应用进展进行了综述,并对其发展前景加以展望,以期为MPCs的功能解析提供技术支撑。展开更多
The dissociative chemisorption of N_(2) is the rate-limiting step for ammonia synthesis in industry.Here,we investigated the role of initially vibrational excitation and ro-tational excitation of N_(2) for its reactiv...The dissociative chemisorption of N_(2) is the rate-limiting step for ammonia synthesis in industry.Here,we investigated the role of initially vibrational excitation and ro-tational excitation of N_(2) for its reactivity on the Fe(111)surface,based on a recently developed six-dimensional potential energy surface.Six-dimensional quantum dynamics study was carried out to investi-gate the effect of vibrational excitation for incidence energy below 1.6 eV,due to sig-nificant quantum effects for this reaction.The effects of vibrational and rotational excitations at high incidence energies were revealed by quasiclassical trajectory calculations.We found that raising the translational energy can enhance the dissociation probability to some extent,however,the vibrational excitation or rotational excitation can promote disso-ciation more efficiently than the same amount of translational energy.This study provides valuable insight into the mode-specific dynamics of this heavy diatom-surface reaction.展开更多
The high-temperature(HT) and low-temperature(LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia(NH3-SCR). In this paper, we report a...The high-temperature(HT) and low-temperature(LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia(NH3-SCR). In this paper, we report a catalyst, Cu2+ loading SAPO-17, synthesized using cyclohexylamine(CHA), which is commercially available and inexpensive and is utilized in NH3-SCR reduction for the first time. After systematic investigations on the optimization of Si and Cu2+ contents, it was concluded that Cu-SAPO-17-8.0%-0.22 displays favorable catalytic performance, even after being heated at 353 K for 24 h and at 973 K for 16 h. Moreover, the locations of CHAs, host–vip interaction and the Bronsted acid sites were explored by Rietveld refinement against powder X-ray diffraction data of as-made SAPO-17-8.0%. The refinement results showed that two CHAs exist within one eri cage and that the protonated CHA forms a hydrogen bond with O4, which indicates that the proton bonding with O4 will form the Bronsted acid site after the calcination.展开更多
基金国家重点研发计划-中国和意大利政府间合作项目(2018YFE0118100)国家自然科学基金(22025206,21721004,21991090,22002159,22088102,21833009)+4 种基金辽宁省“兴辽英才计划”项目(XLYC2002012,XLYC1802126)中国科学院洁净能源创新研究院-榆林学院联合基金(YLU-DNL Fund 2021019)中国科学院科研仪器设备研制项目(YJKYYQ20190003)大连市科技创新基金(2019J12GX031)大连化物所创新研究基金(DICP I202009).
基金国家自然科学基金(批准号:21972136,21676262,21991091)中国科学院百人计划(批准号:Y706071202)+3 种基金中国科学院大连洁净能源创新研究院合作基金(批准号:DNL201908)中国科学院前沿科学重点研究计划(批准号:QYZDB-SSW-JSC040)VR(Swedish Research Council)Starting Grant(批准号:2017-05333)中法国际联合实验室-分子筛资助
文摘膜蛋白质通过与其他蛋白质相互作用形成膜蛋白质复合物(Membrane protein complexes,MPCs)形式来行使重要的生物学功能,譬如参与细胞-细胞交流、信号传导与分子识别等。MPCs的功能异常会导致多种疾病的发生和临床治疗耐药等问题。研究完整MPCs的组装对于绘制全景式蛋白质-蛋白质相互作用网络,进而揭示膜蛋白质机器的功能具有重要意义。然而,由于MPCs的过表达和纯化仍面临巨大挑战,如何从细胞中实现MPCs的高效提取尤为重要。因此,亟需发展既可确保MPCs提取效率,并能保持其结构稳定性的提取方法。该文对现有MPCs提取方法及其应用进展进行了综述,并对其发展前景加以展望,以期为MPCs的功能解析提供技术支撑。
基金supported by the National Key R&D Program of China(No.2018YFE0203003)the National Natural Science Foundation of China(No.22173099 and No.22173101)the Liaoning Revitalization Talents Program(No.XLYC1907190)。
文摘The dissociative chemisorption of N_(2) is the rate-limiting step for ammonia synthesis in industry.Here,we investigated the role of initially vibrational excitation and ro-tational excitation of N_(2) for its reactivity on the Fe(111)surface,based on a recently developed six-dimensional potential energy surface.Six-dimensional quantum dynamics study was carried out to investi-gate the effect of vibrational excitation for incidence energy below 1.6 eV,due to sig-nificant quantum effects for this reaction.The effects of vibrational and rotational excitations at high incidence energies were revealed by quasiclassical trajectory calculations.We found that raising the translational energy can enhance the dissociation probability to some extent,however,the vibrational excitation or rotational excitation can promote disso-ciation more efficiently than the same amount of translational energy.This study provides valuable insight into the mode-specific dynamics of this heavy diatom-surface reaction.
文摘The high-temperature(HT) and low-temperature(LT) hydrothermal stabilities of molecular-sieve-based catalysts are important for the selective catalytic reduction of NOx with ammonia(NH3-SCR). In this paper, we report a catalyst, Cu2+ loading SAPO-17, synthesized using cyclohexylamine(CHA), which is commercially available and inexpensive and is utilized in NH3-SCR reduction for the first time. After systematic investigations on the optimization of Si and Cu2+ contents, it was concluded that Cu-SAPO-17-8.0%-0.22 displays favorable catalytic performance, even after being heated at 353 K for 24 h and at 973 K for 16 h. Moreover, the locations of CHAs, host–vip interaction and the Bronsted acid sites were explored by Rietveld refinement against powder X-ray diffraction data of as-made SAPO-17-8.0%. The refinement results showed that two CHAs exist within one eri cage and that the protonated CHA forms a hydrogen bond with O4, which indicates that the proton bonding with O4 will form the Bronsted acid site after the calcination.
