在HNF-4α核受体复合体结构中的多域集成
Vikas Chandra1, Pengxiang Huang, Nalini Potluri
1Metabolic Signaling and Disease Program, Sanford-Burnham Medical Research Institute, Orlando, Florida 32827, USA.
Nature
|March 15, 2013
概括
肝细胞核因子4α (HNF-4α) 结构揭示了突变如何导致糖尿病. 翻译后的修改和域连接会影响DNA结合,为代谢疾病提供新的治疗点.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 遗传学 是一个遗传学.
背景情况:
- 肝细胞核因子4α (HNF-4α) 是一个关键的转录因子,调节参与新陈代谢的肝脏和胰腺基因.
- 在HNF-4α的突变与糖尿病 (MODY1) 和低血糖有关.
- 以前的核受体 (NR) 结构研究缺乏关于域连接的细节.
研究的目的:
- 确定与DNA和协活性剂结合的人类HNF-4α同极体的晶体结构.
- 阐明HNF-4α的四级结构和域间连接.
- 了解翻译后的修改和突变如何影响HNF-4α功能.
主要方法:
- 2.9 Å人类HNF-4α同位体复合物的晶体结构的确定.
- 分析域连接性,翻译后修改位点 (PRMT1甲基化,蛋白激酶C酸化) 和突变效应.
- 与其他NR结构 (例如PPAR-γ-RXR-α) 的比较.
主要成果:
- 揭示了一个独特的不对称的融合区域,连接多个HNF-4α域.
- 确定了对维护结构完整性和域相互作用至关重要的特定的氨酸和氨酸残留物.
- 证明MODY1突变通过改变域间通信来破坏DNA结合.
- 与其他NR复合体相比,呈现出明显的四级折叠.
结论:
- HNF-4α结构提供了对代谢基因调节的见解.
- 翻译后的修改和突变会通过域间通信影响HNF-4α的DNA结合.
- 独特的结构特征表明,有可能开发针对代谢疾病的HNF-4α的全调节剂.
相关概念视频
Nuclear Export of mRNA
8.8K
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
8.8K
Transducer Mechanism: Nuclear Receptors
2.5K
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
2.5K
Assembly of Complex Microtubule Structures
2.5K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
2.5K
Olfactory Receptors: Location and Structure
11.8K
The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
11.8K
Nuclear Stability
23.2K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
23.2K
Internal Receptors
74.6K
Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
74.6K


