B细胞抗原受体复合体:Ig-alpha和Ig-beta与不同的细胞质效应体的关联
M R Clark1, K S Campbell, A Kazlauskas
1Division of Basic Sciences, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206.
概括
这是B细胞抗原受体复合体.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- B细胞抗原受体 (BCR) 复合体促进了抗原识别和信号转导.
- BCR的传感器-传送器子结构,包括Ig-alpha和Ig-beta子单元,与细胞质效应分子相互作用,但不清楚相互作用地点.
- Src家族激酶在BCR结合时被激活,但它们在受体子单元上的特定结合位仍未确定.
研究的目的:
- 确定细胞质效应分子,包括Src家族激酶,在B细胞抗原受体复合体Ig-alpha和Ig-beta子单元上的特定结合点.
- 阐明这些相互作用在BCR介导的信号传导途径中的作用.
主要方法:
- 同免疫沉试验用于确定受体子单元和效应分子之间的蛋白质与蛋白质相互作用.
- 分析Ig-alpha和Ig-beta的细胞质尾域,用于效应分子结合.
- 位点定向的突变发生和序列分析,以精确确定受体子单元内的关键结合基因.
主要成果:
- 不同的效应分子组与Ig-alpha和Ig-beta的细胞质尾巴有关.
- 伊格-α细胞质域结合了Lyn,Fyn,酸氨基-3激酶 (PI-3激酶) 和一个38kDa的蛋白.
- 细胞质尾部的Ig-β结合PI-3激酶和40/42-kDa的蛋白,结合由一个保存的26氨基酸基因介导.
结论:
- Ig-alpha和Ig-beta子单元独立地与不同的细胞质效应分子结合在一起.
- 在Ig-alpha和Ig-beta中都保留了26个氨基酸基因,介导着与效应分子的结合,这表明信号传导的机制保留了.
- 这些发现揭示了特定的相互作用部位,这些部位对于启动B细胞抗原受体下游的独特的第二信使途径至关重要.
相关概念视频
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The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
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The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
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Overview
Antibody Structure
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
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