含有CENP-A的人类中心核原子的晶体结构
Hiroaki Tachiwana1, Wataru Kagawa, Tatsuya Shiga
1Laboratory of Structural Biology, Graduate School of Advanced Science and Engineering, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.
Nature
|July 12, 2011
概括
人类CENP-A核酶体的晶体结构显示出独特的特征,包括更短的DNA包裹和CENP-A中的一个暴露的循环1,这对于中粒体的继承和稳定性至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 结构生物学 结构生物学
- 遗传学 是一个遗传学.
背景情况:
- 动态细胞通过微管附着来协调染色体分离.
- 中位素指定了动态位,并由CENP-A核细胞体标记.
- 中心质基因遗传很可能是由中心质基因组架构决定的.
研究的目的:
- 确定含有CENP-A的人类中心核核细胞的晶体结构.
- 将CENP-A核体的结构与正规的H3核体进行比较.
- 调查CENP-A独特的结构特征在中心体功能中的作用.
主要方法:
- 进行X射线晶体学以确定与α卫星DNA的人类CENP-A核细胞的结构.
- CENP-A和H3核细胞之间的结构比较.
- 对CENP-A循环1残留物的局部定向突变发生和对人类细胞中CENP-A保留的评估.
主要成果:
- 人类CENP-A核细胞组以左手方向包裹DNA,只有121 bp可见.
- 与H3.3相比,CENP-A具有更短的αN螺旋和一个暴露的循环1与两个额外的残留物.
- 在CENP-A循环1中的突变减少了其在中间体中的保留.
结论:
- CENP-A核酶体的独特结构,特别是循环1,对于中心分子稳定性和遗传性至关重要.
- CENP-A循环1可以作为稳定中心基色素的因子的结合点.
- 这项研究提供了第一个原子分辨率视图的中心分子特异核体.
相关概念视频
01:27Microbial Growth Media
2.3K
Microbial growth media are essential tools in microbiology, providing the nutrients and conditions necessary to cultivate and study microorganisms. These media are categorized by their composition, consistency, and functional roles, enabling researchers to investigate microbial physiology, behavior, and interactions.Types and Consistencies of Growth MediaGrowth media can be solid, liquid, or semisolid. Solid media, often agar-based, allow visible colony growth for isolation and enumeration.
2.3K
02:05Self-Presentation: Self-Monitoring and Self-Handicapping
44.8K
People can go to great lengths to protect their self-image and present themselves in ways that they want others to see them. Sociologist Erving Goffman presented the idea that a person is like an actor on a stage. Calling his theory dramaturgy, Goffman believed that we use “impression management” to present ourselves to others as we hope to be perceived. Each situation is a new scene, and individuals perform different roles depending on who is present (Goffman, 1959). Think about...
44.8K
03:26Framing Effects
8.0K
Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
8.0K
02:07Blind Procedures
13.7K
Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
13.7K
01:33Bacterial Transformation
60.2K
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
60.2K
01:01Group Polarization
39.2K
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
39.2K