概括
在Dictyostelium discoideum发育的早期出现了两个循环AMP依赖的蛋白激酶. 这些酶类似于哺乳动物的激酶,可能会调解循环AMP.
科学领域:
- 细胞和分子生物学 细胞和分子生物学
- 发展生物学 发展生物学
- 生物化学 生化学
背景情况:
- 循环AMP (cAMP) 信号传递在细胞过程中起着至关重要的作用.
- 了解cAMP介导的基因调节是解读发育途径的关键.
- 迪西奥斯蒂 (Dictyostelium discoideum) 作为研究早期发育的模型生物.
研究的目的:
- 在Dictyostelium discoideum早期发育过程中调查循环AMP依赖蛋白激酶的存在和特性.
- 为了确定这些激酶是否参与cAMP介导的基因表达.
主要方法:
- 在不同发育阶段的细胞提取物中分析蛋白激酶活性.
- 已识别的循环AMP依赖蛋白激酶的生物化学表征.
- 与哺乳动物系统中发现的激酶特性进行比较.
主要成果:
- 在Dictyostelium discoideum发育1到2小时内检测到了两种不同的循环AMP依赖蛋白激酶.
- 在植物细胞提取物中没有观察到可比的激酶活性.
- 鉴定到的激酶表现出与哺乳动物中的类型I和类型IIcAMP依赖蛋白激酶相似的特性.
结论:
- 这些激酶的早期出现表明它们在Dictyostelium发育过程中中介于cAMP对基因表达的影响.
- 这些发现提供了关于cAMP信号在真核生物发育中的保存机制的见解.
相关概念视频
01:45Positive Regulator Molecules
100.8K
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
100.8K
02:39Positive Regulator Molecules
5.3K
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
5.3K
01:25cAMP-dependent Protein Kinase Pathways
7.3K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
7.3K
01:11IP3/DAG Signaling Pathway
12.5K
Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
12.5K
01:16Calmodulin-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
01:27Diversity of Protists IV
2.1K
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
2.1K