A role for myosin-1A in the localization of a brush border disaccharidase.

A role for myosin-1A in the localization of a brush border disaccharidase.
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DOI:
10.1083/jcb.200310031
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发表时间:
2004-05-10
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Mooseker MS
Mooseker MS
中科院分区:
其他
文献类型:
--
作者:
Tyska MJ;Mooseker MS

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为了深入了解肌球蛋白-1A(M1A)的功能,我们在肠上皮细胞系CACO-2BBE中表达了该马达的显性负片段。蔗糖酶异麦芽糖酶(SI),一种发现于微绒毛脂筏的跨膜双磷酸酶,在表达该片段的细胞中从刷状缘(BB)缺失。从CACO-2BBE细胞和大鼠微绒毛(MV)中分离的耐洗涤剂膜的密度梯度离心、亲和纯化和免疫纯化均表明M1A和SI位于同一群低密度(≤ 1.12 g/ml)膜上。化学交联的洗涤剂抗性膜从大鼠MV表明,SI和M1A可能在脂筏复合物中相互作用。这种复合物的功能意义通过SI的胞质结构域的表达而突出,这导致较低水平的M1A和来自BB的SI的损失。总之,这些研究是第一个指定一个特定的作用,M1A,并建议,这电机是参与保留SI内的BB。
To gain insight regarding myosin-1A (M1A) function, we expressed a dominant negative fragment of this motor in the intestinal epithelial cell line, CACO-2BBE. Sucrase isomaltase (SI), a transmembrane disaccharidase found in microvillar lipid rafts, was missing from the brush border (BB) in cells expressing this fragment. Density gradient centrifugation, affinity purification, and immunopurification of detergent-resistant membranes isolated from CACO-2BBE cells and rat microvilli (MV) all indicate that M1A and SI reside on the same population of low density (∼1.12 g/ml) membranes. Chemical cross-linking of detergent-resistant membranes from rat MV indicates that SI and M1A may interact in a lipid raft complex. The functional significance of such a complex is highlighted by expression of the cytoplasmic domain of SI, which results in lower levels of M1A and a loss of SI from the BB. Together, these studies are the first to assign a specific role to M1A and suggest that this motor is involved in the retention of SI within the BB.
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