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OCA-B is a functional analog of VP16 but targets a separate surface of the Oct-1 POU domain.

机译:OCA-B是VP16的功能类似物,但靶向Oct-1 POU域的单独表面。

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摘要

OCA-B is a B-cell-specific coregulator of the broadly expressed POU domain transcription factor Oct-1. OCA-B associates with the Oct-1 POU domain, a bipartite DNA-binding structure containing a POU-specific (POU[S]) domain joined by a flexible linker to a POU homeodomain (POU[H]). Here, we show that OCA-B alters the activity of Oct-1 in two ways. It provides a transcriptional activation domain which, unlike Oct-1, activates an mRNA-type promoter effectively, and it stabilizes Oct-1 on the Oct-1-responsive octamer sequence ATGCAAAT. These properties of OCA-B parallel those displayed by the herpes simplex virus Oct-1 coregulator VP16. OCA-B, however, interacts with a different surface of the DNA-bound Oct-1 POU domain, interacting with both the POU(S) and POU(H) domains and the center of the ATGCAAAT octamer sequence. The OCA-B and VP16 interactions with the Oct-1 POU domain are sufficiently different to permit OCA-B and VP16 to bind the Oct-1 POU domain simultaneously. These results emphasize the structural versatility of the Oct-1 POU domain in its interaction with coregulators.
机译:OCA-B是广泛表达的POU结构域转录因子Oct-1的B细胞特异性调节剂。 OCA-B与Oct-1 POU域相关联,Oct-1 POU域是一种双向DNA结合结构,其中包含一个POU特异性(POU [S])域,该域通过一个灵活的接头连接到一个POU同源域(POU [H])。在这里,我们显示OCA-B以两种方式改变Oct-1的活性。它提供了一个转录激活域,与Oct-1不同,它可以有效激活mRNA类型的启动子,并且可以将Oct-1稳定在Oct-1响应八聚体序列ATGCAAAT上。 OCA-B的这些属性与单纯疱疹病毒Oct-1核心调节器VP16所显示的属性相似。但是,OCA-B与DNA结合的Oct-1 POU域的不同表面相互作用,与POU(S)和POU(H)域以及ATGCAAAT八聚体序列的中心都相互作用。 OCA-B和VP16与Oct-1 POU域的相互作用足够不同,以允许OCA-B和VP16同时绑定Oct-1 POU域。这些结果强调了Oct-1 POU域与核心调节剂的相互作用的结构多样性。

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