ATF2

ATF2 Full Name

activating transcription factor 2

ATF2 Introduction

Activating Transcription Factor 2 (ATF2) is a conserved and multifunctional leucine zipper transcription factor belonging to the ATF/CREB protein superfamily, widely expressed in most human tissues and essential for maintaining basic cellular transcription regulation. Encoded by the ATF2 gene located on human chromosome 2q32.2, this protein serves as a core downstream effector of major mitogen-activated protein kinase (MAPK) signaling cascades, including JNK, p38, and ERK pathways. As a key nuclear transcription regulator, ATF2 binds specifically to cyclic AMP response elements (CRE) and activating protein-1 (AP-1) promoter sites on target genes to initiate or suppress gene transcription. Beyond its canonical transcriptional function, ATF2 participates in critical biological processes such as cell cycle progression, cellular stress response, DNA damage repair, and immune homeostasis. Extensive research demonstrates that aberrant ATF2 expression and activation are tightly linked to tumorigenesis, inflammatory disorders, and neurological diseases, making ATF2 a vital functional gene and therapeutic biomarker for human diseases.

Figure 1. Schematic structure of ATF2.

Molecular Activation of ATF2
ATF2 possesses a typical modular protein structure consisting of an N-terminal transactivation domain, a central regulatory region, and a highly conserved C-terminal basic leucine zipper (bZIP) domain. The bZIP domain enables ATF2 to form stable homodimers or heterodimers with other AP-1 family proteins such as c-Jun and c-Fos, significantly expanding its spectrum of target gene binding and transcriptional regulation. Under basal physiological conditions, ATF2 remains in a low-activity dormant state in the cell nucleus. In response to extracellular stress, oxidative damage, or growth factor stimulation, ATF2 undergoes site-specific phosphorylation mediated by MAPK signaling pathways, which triggers conformational changes and activates its transcriptional activity. This dynamic activation mechanism allows ATF2 to rapidly respond to external cellular stimuli and precisely regulate the expression of stress-responsive, proliferation-related, and apoptosis-associated genes, ensuring cellular adaptability to changing microenvironments.

Core Physiological Functions of ATF2
ATF2 executes diverse and essential physiological functions across cell growth, stress adaptation, and tissue development. Primarily, ATF2 acts as a critical cellular stress sensor, activating the transcription of antioxidant and stress-response genes to eliminate intracellular reactive oxygen species, reduce oxidative damage, and protect cells from apoptosis induced by environmental stress. In cell cycle regulation, ATF2 modulates the expression of cyclin family proteins and cell cycle checkpoint genes, effectively controlling cell proliferation, growth arrest, and normal cell differentiation. During embryonic development and tissue remodeling, ATF2 regulates the growth and differentiation of neuronal cells, epidermal cells, and mesenchymal cells, supporting the normal development of the nervous system and epithelial tissues. Additionally, ATF2 participates in modulating inflammatory immune responses by regulating the expression of pro-inflammatory cytokines and chemokines, maintaining the balance between immune activation and immune tolerance in normal physiological states.

Alternate Names for ATF2

ATF2; activating transcription factor 2; cAMP responsive element binding protein 2 , CREB2; cyclic AMP-dependent transcription factor ATF-2; CRE BP1; HB16; TREB7; CREB-2; cAMP-dependent transcription factor ATF-2; cAMP-responsive element-binding protein 2