Role of Two Dileucine-like Motifs in Insulin Receptor Anchoring to Microvilli*

Role of Two Dileucine-like Motifs in Insulin Receptor Anchoring to Microvilli*
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两个双亮氨酸样基序在胰岛素受体锚定微绒毛中的作用*

DOI:
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发表时间:
2002
影响因子:
4.8
通讯作者:
J. Carpentier
J. Carpentier
中科院分区:
生物学2区
文献类型:
--
作者:
S. Shackleton;I. Hamer;Michelangelo Foti;Nicole Zumwald;C. Maeder;J. Carpentier

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在没有配体的情况下,胰岛素受体维持在细胞表面的微绒毛上。二亮氨酸基序(LL986-987)对于这种锚定是必要的,但不是充分的,这还需要在位置1000的下游存在额外的序列。本研究的目的是确定这(这些)额外的序列。首先,外显子16和17融合到补体受体1的细胞外和跨膜结构域,并在中国仓鼠卵巢细胞中稳定表达。结果表明外显子17足以锚定在微绒毛上。其次,对外显子17内截断的胰岛素受体突变体的分析表明,在1000位截断的受体与微绒毛没有优先关联,而在1012位截断的受体与全长胰岛素受体的关联水平相同。第三,在这个12个氨基酸片段中存在的二异亮氨酸基序(II1006-1007)突变取消了受体与微绒毛的优先结合。这些结果表明胰岛素受体与微绒毛结合所需的结构域包含在由外显子17编码的区域内,并且在该序列中,两个二亮氨酸样基序(ll986 - 987和II1006-1007)起关键作用。
In the absence of ligand, the insulin receptor is maintained on microvilli on the cell surface. A dileucine motif (LL986–987) is necessary but not sufficient for this anchoring, which also required the presence of additional sequence(s) downstream of position 1000. The aim of the present study was to identify this (these) additional sequence(s). First, exons 16 or 17 were fused to the extracellular and transmembrane domains of complement receptor 1 and stably expressed in Chinese hamster ovary cells. Results obtained indicate that exon 17 is sufficient for anchoring to microvilli. Second, analysis of insulin receptor mutants truncated within exon 17 demonstrated that whereas receptors truncated at position 1000 showed no preferential association with microvilli, receptors truncated at position 1012 displayed a level of association identical to that of the full-length insulin receptor. Third, mutation of a diisoleucine motif (II1006–1007) present within this 12-amino acid stretch abrogated the preferential association of the receptor with microvilli. These results indicate that the domain required for association of insulin receptor with microvilli is contained within the region encoded by exon 17 and that, within this sequence, two dileucine-like motifs (LL986–987and II1006–1007) play a crucial role.
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