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HBXAP, a Novel PHD-Finger Protein, Possesses Transcription Repression Activity.

机译:HBXAP,一种新型的PHD-手指蛋白,具有转录抑制活性。

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The PHD/LAP (plant homology domain/leukemia associated protein) finger motif is characteristically defined by a histidine and seven cysteines that are spatially arranged in a C4HC3 consensus sequence. This unique zinc finger, found primarily in a wide variety of chromatin-associated proteins, is considered to mediate protein-protein interactions. We have isolated a novel human PHD-finger protein, HBXAP (for hepatitis B virus x associated protein). HBXAP has three alternatively spliced isoforms. We also identified the Drosophila melanogaster HBXAP ortholog, gene CG8677. Based on alignment of four different proteins, we found a novel conserved domain in HBXAP that we designated the HBXAP conserved domain (XCD). We show that HBXAP represses transcription when recruited to DNA via the DNA binding of GAL4. Furthermore, the PHD finger alone suffices to repress transcription, thus attributing a functional role to this domain. The gene HBXAP is localized to the long arm of human chromosome 11 between q13.4 and q14.1. This region is amplified and rearranged in many tumors, suggesting a role for HBXAP in tumorigenesis similar to that of other PHD-containing proteins. (c)2002 Elsevier Science (USA).
机译:PHD / LAP(植物同源性结构域/白血病相关蛋白)手指基序的特征在于在C4HC3共有序列中空间排列的组氨酸和七个半胱氨酸。这种独特的锌指主要存在于多种与染色质相关的蛋白质中,被认为可介导蛋白质与蛋白质的相互作用。我们已经分离出一种新型的人类PHD手指蛋白HBXAP(用于乙型肝炎病毒x相关蛋白)。 HBXAP具有三种交替剪接的同工型。我们还鉴定了果蝇HBXAP直系同源基因CG8677。基于四种不同蛋白质的比对,我们在HBXAP中发现了一个新的保守结构域,我们将其指定为HBXAP保守结构域(XCD)。我们显示,当通过GAL4的DNA结合募集到DNA时,HBXAP会抑制转录。此外,仅PHD手指就足以抑制转录,因此将功能性作用归因于该结构域。 HBXAP基因位于人类第11号染色体的长臂,位于q13.4和q14.1之间。该区域在许多肿瘤中被扩增和重排,表明HBXAP在肿瘤发生中的作用类似于其他含PHD的蛋白质。 (c)2002 Elsevier Science(美国)。

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