Insulin-like Growth Factor-binding Protein 5 Complexes with the Acid-labile Subunit

Insulin-like Growth Factor-binding Protein 5 Complexes with the Acid-labile Subunit
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胰岛素样生长因子结合蛋白 5 与酸不稳定亚基复合物

DOI:
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发表时间:
1998
影响因子:
4.8
通讯作者:
R. Baxter
R. Baxter
中科院分区:
生物学2区
文献类型:
--
作者:
S. Twigg;M. Kiefer;J. Zapf;R. Baxter

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我们最近已经表明胰岛素样生长因子(IGF)结合蛋白5与IGF-I或IGF-II和酸不稳定亚基(ALS)形成三元复合物(Twigg,S. M.,和巴克斯特,R. C.(1998)J.Biol.Chem.273,6074 - 6079)。由于IGF结合蛋白3(IGFBP-3)通过其碱性羧基末端结构域与ALS结合,我们测试了IGFBP-5中存在的同源区域是否参与IGFBP-5与ALS的结合。通过重组人IGF-BP-5和IGFBP-6之间的羧基末端结构域交换产生嵌合肽,产生两种IGFBP肽,命名为5 - 5 - 6和6 - 6 - 5。通过免疫沉淀和Superose色谱法测定,6 - 6 - 5形成三元复合物,尽管不如IGF-BP-5有效。与此相反,5 - 5 - 6,像IGFBP-6,没有形成三元复合物,通过这些方法。而6 - 6 - 5,像IGFBP-6一样,明显偏好与IGF-II而不是IGF-I形成二元复合物,它与IGF-I更有效地形成三元复合物,像IGF-BP-5。糖胺聚糖肝素和硫酸乙酰肝素通过其碱性羧基末端结构域与IGFBP-5结合。在高浓度下,这些糖胺聚糖抑制ALS与二元复合物IGF-BP-5的结合。此外,在不存在IGF的情况下,IGFBP-5(代表碱性羧基末端序列IGFBP-5的合成肽(201 - 218))和相应的IGFBP-3碱性序列IGFBP-3(215 - 232),与具有与IGFBP-5相同组成的随机序列合成肽(201 - 218)一样,对ALS与共价IGF-IGFBP-5复合物的结合进行弱竞争。这些发现与IGFBP-5上的碱性羧基末端结构域是IGFBP-5中结合ALS的主要位点一致。
We have recently shown that insulin-like growth factor (IGF)-binding protein 5 forms ternary complexes with IGF-I or IGF-II and the acid-labile subunit (ALS) (Twigg, S. M., and Baxter, R. C. (1998) J. Biol. Chem. 273, 6074–6079). Because IGF-binding protein 3 (IGFBP-3) binds to ALS through its basic carboxyl-terminal domain, we tested whether a homologous region present in IGFBP-5 is involved in IGFBP-5 binding to ALS. Chimeric peptides were generated by carboxyl-terminal domain interchange between recombinant human IGF-BP-5 and IGFBP-6, producing two IGFBP peptides designated 5-5-6 and 6-6-5. Determined by immunoprecipitation and by Superose chromatography, 6-6-5 formed ternary complexes, albeit less potently than IGF-BP-5. In contrast, 5-5-6, like IGFBP-6, did not form ternary complexes by these methods. Whereas 6-6-5, like IGFBP-6, had a marked preference for binary complex formation with IGF-II rather than IGF-I, it formed ternary complexes more efficiently with IGF-I, like IGF-BP-5. The glycosaminoglycans heparin and heparan sulfate bind to IGFBP-5 through its basic carboxyl-terminal domain. At high concentrations, these glycosaminoglycans inhibited ALS binding to binary complexed IGF-BP-5. In addition, in the absence of IGFs, IGFBP-5, a synthetic peptide representing the basic carboxyl-terminal sequence IGFBP-5(201–218), and the corresponding IGFBP-3 basic sequence IGFBP-3(215–232), competed weakly for ALS binding to covalent IGF–IGFBP-5 complex, as did a random-sequence synthetic peptide with the same composition as IGFBP-5(201–218). These findings are consistent with the basic carboxyl-terminal domain on IGFBP-5 being the principal site in IGFBP-5 that binds to ALS.
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