通过基突变和脂质进行TRPML1门调节
Ninghai Gan1,2, Yan Han2, Weizhong Zeng1,2
1Howard Hughes Medical Institute and Department of Physiology, University of Texas Southwestern Medical Center, Dallas, United States.
eLife
|October 14, 2024
概括
研究人员在TRPML1通道中发现了关键残留物Tyr404,该残留物对于调节IV型粘脂症中其功能至关重要. 这个部位的突变为开发TRPML1激活剂和抑制剂创造了新的标.
科学领域:
- 分子生物学分子生物学
- 生物化学 生化学
- 结构生物学是结构生物学.
背景情况:
- 暂时受体潜在粘脂蛋白1 (TRPML1) 是一种溶酶体阴离子通道.
- 在TRPML1中失去功能的突变会导致IV型粘脂症 (MLIV),一种溶酶体储存障碍.
- 通过全调节,TRPML1活动受到各种配体的调节,包括脂质和合成分子.
研究的目的:
- 为了确定TRPML1中的功能关键残留物,这些残留物调节全调节.
- 作为潜在的药物查目标,特征新型功能增益和功能丧失TRPML1突变.
- 阐明由氨酸化物抑制TRPML1的结构基础.
主要方法:
- 局部定向的突变发生产生Tyr404突变 (Trp和Ala).
- 突变TRPML1通道的功能特征.
- 高分辨率的TRPML1的结构性确定与PI的复合中{4,5) P2.2.
主要成果:
- Tyr404被确定为TRPML1全质调节的关键残留物.
- 在Tyr404的突变导致功能增益 (Trp) 和功能丧失 (Ala) 通道.
- 该结构揭示了PI(4,5) P2结合在与激素主体/对抗体热点重叠的位置,解释了脂质抑制.
- 在同一地点发现了一种内源性脂,可能是斯芬戈米林,这解释了斯芬戈米林的抑制作用.
结论:
- Tyr404突变为研究TRPML1全调节和药物发现提供了新的工具.
- 对PI{4,5) P2和基米林结合的结构洞察力提供了对TRPML1抑制的机制理解.
- 这些发现促进了对TRPML1通道功能及其在MLIV病变发生中的作用的理解.
相关概念视频
Enzyme-linked Receptors
77.5K
Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
77.5K
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.1K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.1K
Repressible Operon: trp Operon
3
The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
3
Activation and Inactivation of G Proteins
6.8K
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
6.8K
Cooperative Allosteric Transitions
2.3K
2.3K
Regulation of Nuclear Protein Sorting
2.4K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.4K


