在不同状态下的TRPML2揭示了TRPML家族的激活和调制原理
Philip Schmiege1, Dawid Jaślan2, Michael Fine3
1Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature communications
|June 17, 2025
概括
这项研究揭示了TRPML2通道激活器如何结合和功能,揭示了一个独特的π-凸过渡机制. 这些发现为开发用于内分泌体调节的选择性TRPML调节剂铺平了道路.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 离子通道生理学
背景情况:
- TRPML2通道活动对内分泌体功能和化学激素释放至关重要.
- 现有的TRPML2调节器,如ML-SI3异构体,表现出相反的效果,其机制尚不清楚.
- 了解TRPML2激活对于开发向治疗来说至关重要.
研究的目的:
- 为了阐明TRPML2通道激活由连接体的分子机制.
- 调查TRPML2调制中异构体偏好的结构基础.
- 确定涉及TRPML通道封锁的关键结构元素.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定不同状态的TRPML2结构.
- 生物化学和功能测试以评估通道活动.
- 位点定向的突变发生以探测结构-功能关系.
主要成果:
- 六个冷EM结构揭示了S6段在激动剂结合时的π-α过渡.
- PI(3,5) P2在全质上影响ML2-SA1结合,在没有π-α过渡的情况下打开通道.
- 将TRPML1 S5转变为TRPML2赋予了对特定激活器的敏感性,表明S5在差异激活中的作用.
结论:
- 在TRPML2离子通道调节和激活中,S6 π-凸起起着至关重要的作用.
- 不同的TRPML2配体存在不同的激活通路,包括PI(3,5) P2介导的全调节.
- 结构洞察力使得选择性TRPML通道调节器的合理设计成为可能.
更多相关视频
08:27Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
Published on: January 7, 2019
9.6K
10:26TRAP-rc, Translating Ribosome Affinity Purification from Rare Cell Populations of Drosophila Embryos
Published on: September 10, 2015
18.0K
相关概念视频
Repressible Operon: trp Operon
174
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...
174
tRNA Activation
20.2K
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
20.2K
Enzyme-linked Receptors
80.1K
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...
80.1K
RNA Polymerase II Accessory Proteins
9.6K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
9.6K
Transcription Attenuation in Prokaryotes
16.2K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
16.2K
The Two-State Receptor Model
2.5K
The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...
The binding affinity of a drug determines its interaction with...
2.5K
