Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.
FEBS Lett. 2013 Jan 31;587(3):272-7. doi: 10.1016/j.febslet.2012.12.011. Epub 2012 Dec 22.
Cerebral cavernous malformations (CCM) are neurovascular dysplasias affecting up to 0.5% of the population. Mutations in the CCM2 gene are associated with acquisition of CCM. We identify a previously uncharacterized domain at the C-terminus of CCM2 and determine its 1.9Å resolution crystal structure. Because this domain is structurally homologous to the N-terminal domain of harmonin, we name it the CCM2 harmonin-homology domain or HHD. CCM2 HHD is observed in two conformations, and we employ analytical ultracentrifugation to test its oligomerization. Additionally, CCM2 HHD contains an unusually long 13-residue 3(10) helix. This study provides the first structural characterization of CCM2.
脑内海绵状血管畸形(CCM)是一种影响人群达 0.5%的神经血管发育不良。CCM2 基因突变与 CCM 的发生相关。我们鉴定了 CCM2 末端一个之前未被描述的结构域,并解析了其 1.9Å 的晶体结构。由于这个结构域在结构上与 harmonin 的 N 端结构域同源,我们将其命名为 CCM2 harmonin 同源结构域或 HHD。我们观察到 CCM2 HHD 存在两种构象,并通过分析超速离心实验来检测其寡聚化。此外,CCM2 HHD 包含一个异常长的 13 残基 3(10)螺旋。本研究首次对 CCM2 进行了结构特征分析。