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首页> 外文期刊>Biochimica et Biophysica Acta. Protein Structure and Molecular Enzymology >8-Cysteine TGF-BP structural motifs are the site of covalent binding between mouse LTBP-3, LTBP-2, and latent TGF-β1
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8-Cysteine TGF-BP structural motifs are the site of covalent binding between mouse LTBP-3, LTBP-2, and latent TGF-β1

机译:8-半胱氨酸TGF-BP结构基序是小鼠LTBP-3,LTBP-2和潜在TGF-β1之间共价结合的位点

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摘要

The small latent TGF-β complex often is associated with the latent TGF-β binding protein (LTBP). Three LTBPs (LTBP-1,-2, and -3) have been isolated to date. Previous studies have shown that LTBP-1 binds the small latent TGF-β1 complex through a disulfide bond between an 8-cysteine structural motif of LTBP-1 (TGF-bp repeat) and the propeptide dimer of latent TGF-β1 (TGF-β1 latency associated peptide). There is indirect evidence that LTBP-2 and LTBP-3 also bind the latent TGF-β complex, but the nature and location of the binding interaction are unknown. We have used immunoprecipitation, SDS-PAGE, and autoradiography to characterize the association between mouse LTBP-3 and the small latent TGF-β1 complex. We report that the second and third TGF-bp repeats of LTBP-3 covalently bind the latent complex, and we show a similar capability for the homologous TGF-bp repeats of mouse LTBP-2. The second TGF-bp repeat of LTBP-3 is unusual in that is has 9 cysteine residues instead of 8, and our results provide the first evidence that a TGF-bp repeat with an odd number of cysteine residues can covalently bind latent TGF-β1. Altogether, these results have important implications for TGF-β biosynthesis and the regulation of TGF-β activity.
机译:潜在的TGF-β小复合物通常与潜在的TGF-β结合蛋白(LTBP)相关。迄今为止,已经隔离了三个LTBP(LTBP-1,-2和-3)。先前的研究表明LTBP-1通过LTBP-1的8个半胱氨酸结构基序(TGF-bp重复)与潜在TGF-β1的前肽二聚体(TGF-β1)之间的二硫键结合小潜伏的TGF-β1复合物。潜伏期相关肽)。间接证据表明LTBP-2和LTBP-3也结合潜在的TGF-β复合物,但结合相互作用的性质和位置尚不清楚。我们已经使用免疫沉淀,SDS-PAGE和放射自显影来表征小鼠LTBP-3和小的潜在TGF-β1复合物之间的关联。我们报告说,LTBP-3的第二个和第三个TGF-bp重复共价结合潜在复合物,并且我们对小鼠LTBP-2的同源TGF-bp重复显示出相似的功能。 LTBP-3的第二个TGF-bp重复序列是不寻常的,因为它具有9个半胱氨酸残基而不是8个半胱氨酸残基,我们的结果提供了第一个证据,即具有奇数个半胱氨酸残基的TGF-bp重复序列可以共价结合潜在的TGF-β1 。总之,这些结果对于TGF-β的生物合成和TGF-β活性的调节具有重要意义。

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