A new model for growth factor activation: type II receptors compete with the prodomain for BMP-7.

A new model for growth factor activation: type II receptors compete with the prodomain for BMP-7.
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DOI:
10.1016/j.jmb.2008.06.074
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发表时间:
2008-09-12
影响因子:
5.6
通讯作者:
Sakai, Lynn Y.
Sakai, Lynn Y.
中科院分区:
生物学2区
文献类型:
--
作者:
Sengle, Gerhard;Ono, Robert N.;Lyons, Karen M.;Bachinger, Hans Peter;Sakai, Lynn Y.

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骨形态发生蛋白(BMPs)是具有长距离信号传导活性的形态发生蛋白。BMP-7作为由与两个前肽非共价结合的生长因子组成的稳定复合物分泌。在其他转化生长因子-β-样生长因子复合物中,前结构域(pd)赋予复合物潜伏期。然而,我们在多个体外生物活性测定中检测到生长因子和BMP-7复合物之间的信号传导能力没有差异。生物化学和生物物理方法阐明了BMP-7复合物与其I型和II型受体的胞外结构域之间的相互作用。结果表明,II型受体,如BMP受体II,激活素受体IIA,和激活素受体IIB,竞争与生长因子结合的PD和位移的复合物的PD。相比之下,I型受体与复合物相互作用而不取代PD。这些研究提出了一种新的生长因子激活模型,其中不需要蛋白酶或其他细胞外分子,并提供了与BMP受体在建立早期形态梯度中的作用一致的分子机制。
Bone morphogenetic proteins (BMPs) are morphogens with long-range signaling activities. BMP-7 is secreted as a stable complex consisting of a growth factor noncovalently associated with two propeptides. In other transforming growth factor-β-like growth factor complexes, the prodomain (pd) confers latency to the complex. However, we detected no difference in signaling capabilities between the growth factor and the BMP-7 complex in multiple in vitro bioactivity assays. Biochemical and biophysical methods elucidated the interaction between the BMP-7 complex and the extracellular domains of its type I and type II receptors. Results showed that type II receptors, such as BMP receptor II, activin receptor IIA, and activin receptor IIB, competed with the pd for binding to the growth factor and displaced the pd from the complex. In contrast, type I receptors interacted with the complex without displacing the pd. These studies suggest a new model for growth factor activation in which proteases or other extracellular molecules are not required and provide a molecular mechanism consistent with a role for BMP receptors in the establishment of early morphogen gradients.
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