环AMP依赖性转录因子ATF-2 (cAMP依赖性转录因子ATF-2) (激活转录因子2) (环AMP响应元件结合蛋白2) (CREB-2) (cAMP响应元件结合蛋白2) (HB16) (cAMP响应元件结合蛋白CRE-BP1)
环AMP依赖性转录因子ATF-2 (cAMP依赖性转录因子ATF-2) (激活转录因子2) (环AMP响应元件结合蛋白2) (CREB-2) (cAMP响应元件结合蛋白2) (HB16) (cAMP响应元件结合蛋白CRE-BP1)
P15336功能描述
转录激活因子,调节多种基因的转录,包括参与抗凋亡、细胞生长和DNA损伤反应的基因。依赖于其结合伴侣,结合CRE(cAMP反应元件)共有序列(5'-TGACGTCA-3')或AP-1(激活蛋白1)共有序列(5'-TGACTCA-3')。在细胞核中,除了参与细胞发育、增殖和死亡相关的特定转录活性外,还参与全局转录和DNA损伤反应。在细胞质中,与线粒体外膜上的含HK1和VDAC1复合物相互作用并干扰它们,从而削弱线粒体膜电位,诱导线粒体渗漏并促进细胞死亡。磷酸化形式(由ATM介导)在DNA损伤反应中发挥作用,并参与电离辐射(IR)诱导的S期检查点控制以及MRN复合物募集到IR诱导的病灶(IRIF)中。表现出组蛋白乙酰转移酶(HAT)活性,在体外特异性乙酰化组蛋白H2B和H4(PubMed:10821277)。与CUL3和RBX1协同,促进KAT5的降解,从而减弱其乙酰化并激活ATM的能力。根据组织或细胞类型的不同,可诱发致癌或抑癌活性。 {ECO:0000269|PubMed:10821277, ECO:0000269|PubMed:15916964, ECO:0000269|PubMed:18397884, ECO:0000269|PubMed:22304920}。
组织特异性
Ubiquitously expressed, with more abundant expression in the brain.
亚细胞定位
Nucleus. Cytoplasm. Mitochondrion outer membrane. Note=Shuttles between the cytoplasm and the nucleus and heterodimerization with JUN is essential for the nuclear localization. Localization to the cytoplasm is observed under conditions of cellular stress and in disease states. Localizes at the mitochondrial outer membrane in response to genotoxic stress. Phosphorylation at Thr-52 is required for its nuclear localization and negatively regulates its mitochondrial localization. Co-localizes with the MRN complex in the IR-induced foci (IRIF).
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