Trafficking and Folding Defects in Hereditary Spherocytosis Mutants of the Human Red Cell Anion Exchanger

Trafficking and Folding Defects in Hereditary Spherocytosis Mutants of the Human Red Cell Anion Exchanger
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人红细胞阴离子交换器遗传性球形红细胞增多症突变体的运输和折叠缺陷

DOI:
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发表时间:
2000
期刊:
Traffic : the International Journal of Intracellular Transport
影响因子:
--
通讯作者:
R. Reithmeier
R. Reithmeier
中科院分区:
--
文献类型:
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作者:
J. A. Quilty;R. Reithmeier

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遗传性球形红细胞增多症(HS)是一种常见的遗传性溶血性贫血,由红细胞蛋白(包括阴离子交换剂AE1(带3))突变引起。本研究检查了位于人AE1膜结构域中的与该疾病相关的7个错义突变(L707 P、R760 Q、R760 W、R808 C、H834 P、T837 M和R870 W)。构建在全长AE1 cDNA中的HS突变体可以在HEK 293细胞中瞬时表达至相似水平。免疫荧光、细胞表面生物素化和脉冲追踪标记显示,HS突变体都表现出从内质网到质膜的细胞运输缺陷。与抑制剂亲和基质的结合受损表明突变蛋白具有非天然结构,可能是错误折叠的。HS R760Q突变体的进一步表征显示,与野生型AE1相比,其寡聚体结构或周转(半衰期=15 h)没有变化,表明突变体没有聚集或通过蛋白酶体快速降解。HS突变体AE1的细胞内保留将导致红系发育期间蛋白质的破坏,并将解释成熟红细胞质膜中HS突变体AE1的缺乏。
Hereditary spherocytosis (HS) is a common inherited hemolytic anemia caused by mutations in erythrocyte proteins including the anion exchanger, AE1 (band 3). This study examined seven missense mutations (L707P, R760Q, R760W, R808C, H834P, T837M, and R870W) located in the membrane domain of the human AE1 that are associated with this disease. The HS mutants, constructed in full‐length AE1 cDNA, could be transiently expressed to similar levels in HEK 293 cells. Immunofluorescence, cell surface biotinylation, and pulse chase labeling showed that the HS mutants all exhibited defective cellular trafficking from the endoplasmic reticulum to the plasma membrane. Impaired binding to an inhibitor affinity matrix indicated that the mutant proteins had non‐native structures and may be misfolded. Further characterization of the HS R760Q mutant showed no change in its oligomeric structure or turnover (half‐life=15 h) compared to wild‐type AE1, suggesting the mutant was not aggregated or targeted for rapid degradation via the proteasome. Intracellular retention of HS mutant AE1 would lead to destruction of the protein during erythroid development and would account for the lack of HS mutant AE1 in the plasma membrane of the mature red cell.
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发表时间: 1992
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