GAPDH 血输送到 二二氧化酶 1 涉及它们的复杂形成和在蛋白质-蛋白质接口上的互补电荷配对
Pranjal Biswas1, Yue Dai1, Dhanya T Jayaram1
1Department of Inflammation and Immunity, Cleveland Clinic Lerner College of Medicine of Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.
甘甲基3-酸盐脱酶 (GAPDH) 通过直接接触将血红素传递给氨酸2,3-二氧化酶1 (IDO1). 这种涉及特定电荷配对的相互作用对于哺乳动物的IDO1成熟和功能至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生化学
- 分子生物学分子生物学
背景情况:
- 血红素生物合成的最后步骤发生在线粒体中,需要将血红素运输到细胞质蛋白质中.
- 甘甲基3-酸盐脱酶 (GAPDH) 作为细胞内血红素陪伴剂,但其传递机制尚不清楚.
- 目前尚不清楚GAPDH是否直接将血红素转移到客户端或使用中间蛋白质.
研究的目的:
- 为了研究从GAPDH转移到其客户蛋白质,胺二二氧化酶1 (IDO1) 的血转移机制.
- 为了确定GAPDH和IDO1之间的直接接触是否是必要的.
主要方法:
- 使用化学交叉连接质谱法来识别GAPDH-IDO1相互作用接口.
- 构建了GAPDH-IDO1复合体的模型,并使用点突变生成来研究接触的作用.
- 在纯化形式和HEK293T人体细胞中评估了GAPDH和IDO1变异的功能.
主要成果:
- 确定了GAPDH和IDO1之间的特定接口,涉及两个Lys残留物.
- 证明了GAPDH和IDO1之间的直接接触对于细胞血红转移至关重要.
- 揭示了在接口上的Lys-Asp电荷配对相互作用促进了血的输送.
结论:
- 血红细胞从GAPDH转移到IDO1需要通过特定电荷相互作用介导的直接物理接触.
- 这一发现澄清了功能性IDO1成熟的关键步骤.
- 提高了对GAPDH在哺乳动物细胞内血贩运中的作用的理解.
更多相关视频
08:57Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
Published on: February 24, 2018
08:02Benchtop Immobilized Metal Affinity Chromatography, Reconstitution and Assay of a Polyhistidine Tagged Metalloenzyme for the Undergraduate Laboratory
Published on: August 23, 2018
相关概念视频
Gene Families
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Globular and Fibrous Proteins
Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
Protein and Protein Structure
A protein's shape is critical to its function. For example, an enzyme...
Protein Modifications in the RER
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal...
Translocation of Proteins into the Mitochondria
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Induced-fit Model
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...
