Structures of non-prion amyloids

非朊病毒淀粉样蛋白的结构

• 批准号: 8349933
• 负责人: Reed B. WICKNER
• 金额: $ 29.3万
• 依托单位: NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES
• 依托单位国家: 美国
• 资助国家: 美国
• 起止时间: 至
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/8349933
• 关键词: Acids; Adhesions; Amyloid; Amyloid Fibrils; Amyloidosis; Amyotrophic Lateral Sclerosis; Anabolism; Architecture; Biogenesis; Cell Adhesion; Cell surface; Cells; Collaborations; Complement; Cytoplasm; Escherichia coli; Escherichia coli Proteins; Filament; Growth; Homologous Gene; Human; Melanins; Melanosomes; Mus; Neurons; Organism; Orthologous Gene; Patients; Prealbumin; Prion Diseases; Proteins; RNA-Binding Protein FUS; Role; Serum Proteins; Structure; Yeast Model System; Yeasts; Zebrafish; aging population; amyloid formation; amyloid structure; base; beta pleated sheet; cell growth; melanocyte; non-prion; pMel17 antigen; protein TDP-43; yeast prion

We have studied several non-prion amyloids that have normal functions for their respective organisms: Pmel17, a mammalian melanocyte protein that normally forms amyloid involved in melanin biosynthesis and curli, a cell-surface amyloid of E. coli that is involved in adhesion. We found that the repeat domain of human Pmel17 is able to form an amyloid structure that forms readily at the mildly acid pH typical of the melanocyte, and rapidly dissolves at neutral pH (1). The repeat domains of Pmel17 homologs from mouse and zebrafish have little conservation of sequence, but do conserve the ability to form amyloid specifically at the acid pH of the melanosome (2). We characterized the amyloid form by curli proteins and found that they are not in the in-register parallel architecture typical of the yeast prion amyloids (3). In collaboration with the Frank Shewmaker (USUHS), we also studied the FUS protein that is found aggregated in the cytoplasm of neurons of patients with amyotrophic lateral sclerosis. We found that FUS aggregates in yeast cells, producing a marked growth inhibition (4). As in ALS neurons, FUS tends to co-aggregate with TDP-43 when co-expressed in yeast (4). 1. McGlinchey RP, Shewmaker F, McPhie P, Monterroso B, Thurber KR & Wickner RB (2009) The repeat domain of the melanosome fibril protein Pmel17 forms the amyloid core promoting melanin synthesis. Proc. Natl. Acad. Sci. USA 106: 13731-6. 2. McGlinchey, R., Shewmaker, F., Hu, K. H., McPhie, P., Tycko, R., Wickner, RB (2011) Repeat domains of melanosome matrix protein Pmel17 orthologs form amyloid fibrils at the acidic melanosomal pH. J. Biol. Chem. 286: 8385-93. 3. Shewmaker F, McGlinchey R, Thurber KR, McPhie P, Dyda F, Tycko R & Wickner RB (2009) The functional curli amyloid is not based on in-register parallel beta-sheet structure. J. Biol. Chem. 284: 25065 - 25076. 4. Kryndushkin DS, Wickner RB, Shewmaker F. FUS/TLS forms cytoplasmic aggregates, inhibits cell growth and interacts with TDP-43 in a yeast model of amyotrophic lateral sclerosis. Protein Cell 2011; 2:223 - 36.

我们研究了几种对各自生物体具有正常功能的非朊病毒淀粉样蛋白：Pmel17，一种哺乳动物黑素细胞蛋白，通常形成参与黑色素生物合成的淀粉样蛋白；以及curli，一种参与粘附的大肠杆菌细胞表面淀粉样蛋白。 我们发现人 Pmel17 的重复结构域能够形成淀粉样蛋白结构，该结构在黑素细胞典型的弱酸性 pH 值下容易形成，并在中性 pH 值下快速溶解 (1)。 来自小鼠和斑马鱼的 Pmel17 同源物的重复结构域几乎没有序列保守性，但确实保留了在黑色素体的酸性 pH 条件下特异性形成淀粉样蛋白的能力 (2)。 我们通过 Curli 蛋白表征了淀粉样蛋白的形式，发现它们不属于酵母朊病毒淀粉样蛋白典型的登记内平行结构 (3)。 我们与 Frank Shewmaker (USUHS) 合作，还研究了聚集在肌萎缩侧索硬化症患者神经元细胞质中的 FUS 蛋白。 我们发现 FUS 在酵母细胞中聚集，产生明显的生长抑制 (4)。 与 ALS 神经元一样，FUS 在酵母中共表达时倾向于与 TDP-43 共聚集 (4)。 1. McGlinchey RP、Shewmaker F、McPhie P、Monterroso B、Thurber KR 和 Wickner RB (2009) 黑素体原纤维蛋白 Pmel17 的重复结构域形成促进黑色素合成的淀粉样蛋白核心。过程。国家。阿卡德。科学。美国 106：13731-6。 2. McGlinchey, R.、Shewmaker, F.、Hu, K. H.、McPhie, P.、Tycko, R.、Wickner, RB (2011) 黑素体基质蛋白 Pmel17 直向同源物的重复结构域在酸性黑素体 pH 下形成淀粉样原纤维。 J.Biol。化学。 286：8385-93。 3. Shewmaker F、McGlinchey R、Thurber KR、McPhie P、Dyda F、Tycko R 和 Wickner RB (2009) 功能性 Curli 淀粉样蛋白并非基于登记内平行 β-折叠结构。 J.Biol。化学。 284：25065 - 25076。 4. Kryndushkin DS、Wickner RB、Shewmaker F。在肌萎缩侧索硬化症酵母模型中，FUS/TLS 形成细胞质聚集体，抑制细胞生长并与 TDP-43 相互作用。蛋白质细胞2011; 2:223 - 36。