在Src酶中对药物耐药性的规模分析揭示了自抑制和催化域动态的调节网络合
Sujata Chakraborty1, Ethan Ahler2, Jessica J Simon1
1Department of Chemistry, University of Washington, Seattle, WA 98195, USA.
Cell chemical biology
|September 8, 2023
概括
了解酶抑制剂耐药性对于癌症治疗至关重要. 这项研究揭示了Src氨酸激酶突变体中的新型耐药性机制,揭示了药物开发的新途径.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- 激酶抑制剂是癌症治疗的重要手段,但耐药性往往限制了它们的有效性.
- 虽然已知许多耐药性突变,但对激酶抑制剂耐药性的完整机制尚不清楚.
- 氨酸激酶是各种癌症的关键标,了解其耐药性是临床相关的.
研究的目的:
- 综合描述Src氨酸激酶对ATP竞争性抑制剂的耐药性突变.
- 为了确定新的机制和途径驱动药物耐药性在酶抑制剂.
- 探索特定残留集群在酶活性和药物反应中的调控作用.
主要方法:
- 针对四种不同的ATP竞争性抑制剂,对大约3,500种Src氨酸激酶突变体进行了系统的分析.
- 在催化域内分析突变分布及其对抑制剂结合的影响.
- 研究涉及酶自身抑制的残留集群及其在耐药性中的作用.
主要成果:
- 抗性突变分布在Src的催化域中,影响抑制剂接触部位和调节残留物.
- 在N端叶上发现了一种新的残留集群,该集群对于自身抑制至关重要,易发生抗性突变.
- 这个群中的突变降低了抑制剂的亲和力,并促进了激酶过活化,从而导致药物耐药性.
结论:
- 药物耐药性分析可以阐明潜在的耐药性途径,并发现新的激酶调节机制.
- 了解特定残留集群的动态和调节作用是克服激酶抑制剂耐药性的关键.
- 这项研究提供了对Src激酶调节的见解,并提供了开发更有效的癌症治疗方法的策略.
相关概念视频
Receptor Tyrosine Kinases
13.1K
Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
13.1K
Amplifying Signals via Enzymatic Cascade
8.5K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
8.5K
PI3K/mTOR/AKT Signaling Pathway
3.6K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
3.6K
Interactions Between Signaling Pathways
6.3K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.3K
mTOR Signaling and Cancer Progression
3.8K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
3.8K
Assembly of Signaling Complexes
5.8K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.8K


