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
中科院分区:
文献类型:
--
作者:
S. Twigg;M. Kiefer;J. Zapf;R. Baxter
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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DOI:
10.1210/mend-5-7-938
发表时间:
1991
期刊:
Molecular endocrinology (Baltimore, Md.)
影响因子:
--
作者:
Shimasaki,S;Gao,L;Shimonaka,M;Ling,N
通讯作者:
Ling,N
DOI:
10.1073/pnas.94.24.12981
发表时间:
1997-11-25
影响因子:
11.1
作者:
Kim, HS;Nagalla, SR;Rosenfeld, RG
通讯作者:
Rosenfeld, RG
影响因子:
4.8
作者:
Busby,WH;Hossenlopp,P;Binoux,M;Clemmons,DR
通讯作者:
Clemmons,DR
影响因子:
20.3
作者:
John I. Jones;D. Clemmons
通讯作者:
John I. Jones;D. Clemmons
DOI:
10.1161/01.hyp.0000027134.14160.1d
发表时间:
2002
期刊:
Hypertension (Dallas, Tex. : 1979)
影响因子:
--
作者:
Parhami-Seren,Behnaz;Haberly,Richard;Margolies,MichaelN;HaupertJr,GarnerT
通讯作者:
HaupertJr,GarnerT