具有明显抑制功能的MAP激酶在酵母分化过程中赋予信号特异性
H D Madhani1, C A Styles, G R Fink
1Whitehead Institute for Biomedical Research, Cambridge, Massachusetts 02142, USA.
Cell
|December 11, 1997
概括
这项研究揭示了酵母中的Fus3和Kss1基激活蛋白激酶 (MAPK) 的不同作用. Kss1控制了线程,而Fus3调节了交配,两者都有独特的抑制功能,以防止通路交叉.
科学领域:
- 细胞信号传递途径 细胞信号传递途径
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
背景情况:
- 在*Saccharomyces cerevisiae* (酵母菌) 中,丝状侵入性生长取决于基激活蛋白激酶 (MAPK) 信号级联.
- 这种级联与交配费洛蒙反应途径共享组件,表明这些细胞过程之间可能存在重叠或交叉.
研究的目的:
- 阐明不同MAPK在不同的细胞过程中的特定作用,如交配和线条形成.
- 研究这些MAPKs的酶依赖和独立功能.
- 了解如何调节和防止通道交叉的情况.
主要方法:
- 在S. cerevisiae*中对MAPK功能进行比较分析.
- 基因操纵研究Fus3和Kss1MAPKs的作用.
- 研究蛋白质-蛋白质相互作用和转录调节.
主要成果:
- Fus3 MAPK主要参与交配,而Kss1 MAPK则调节线条和入侵.
- 无论是Kss1还是Fus3,都表现出酶独立的抑制功能.
- 通过与转录因子Ste12.2相互作用,Kss1直接抑制了线程通路.
- Fus3 防止了费洛蒙反应通路的不适当激活入侵.
- 丢失Fus3导致交叉声交换,在这种情况下,交配费洛蒙通过Kss1.1激活了通过丝的特定基因.
结论:
- 在 *S. cerevisiae* 中的交配和纤维化途径使用不同的MAPK (分别是Fus3和Kss1).
- Fus3和Kss1的激酶独立功能对于保持通路特异性和防止异常信号传递至关重要.
- 了解这些不同的作用和调节机制是理解酵母细胞命运决定和侵入性生长的关键.
更多相关视频
相关概念视频
Microtubule Associated Proteins (MAPs)
4.8K
Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
4.8K
Microtubule Instability
5.0K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.0K
Calmodulin-dependent Signaling
5.0K
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
5.0K
Microbes in Food Production
403
Microbial fermentation is central to food biotechnology, enhancing flavor, texture, preservation, and stability. Fermentative microorganisms metabolize carbohydrates into organic acids, alcohols, and other metabolites that inhibit spoilage organisms and improve digestibility while contributing distinctive sensory qualities.In baking, amylases naturally present in flour hydrolyze starch into monosaccharides such as glucose, which Saccharomyces cerevisiae ferments anaerobically. Through...
403
Inhibitors of Gram-positive Cell Wall Synthesis
191
Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...
191
Clinical Significance of Antibiotic Resistance
90
Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within...
90


