High-mobility group AT-hook 2–DNA complex (HMGA2–DNA complex)

The High-mobility group AT-hook 2 (HMGA2)–DNA complex represents a functional interaction between the non-histone architectural protein HMGA2 and AT-rich regions of the genome [1]. HMGA2 contains three highly conserved 'AT-hook' motifs that bind to the minor groove of DNA, inducing conformational changes that facilitate the assembly of transcriptional complexes and enhanceosomes [2]. This protein is highly expressed during embryogenesis but is virtually undetectable in most adult tissues, making its reactivation a specific marker and driver for various malignancies [3]. In oncogenic contexts, the HMGA2–DNA complex promotes the epithelial-mesenchymal transition (EMT), stemness, and metastasis by regulating the expression of genes such as SNAIL1 and CCNA2 [4]. Therapeutic intervention typically involves small molecules, such as minor groove binders (e.g., netropsin derivatives), designed to displace HMGA2 from its DNA binding sites and suppress its oncogenic signaling [5]. Challenges in targeting this complex include the potential for off-target effects on other DNA-binding proteins and the inherent difficulty of disrupting protein-DNA interfaces with high specificity [6]. Sources: [1] UniProt Consortium. "P52926 (HMGA2_HUMAN)." [2] Reeves, R. "Molecular biology of HMGA proteins: hubs of nuclear function." Gene (2014). [3] Hammond, S. M., & Sharpless, N. E. "HMGA2, microRNAs, and stem cell aging." Cell (2008). [4] Morishita, A., et al. "HMGA2 is a driver of tumor metastasis." Cancer Research (2013). [5] Hock, R., et al. "The HMG-I/Y family of nuclear proteins." Trends in Biochemical Sciences (2002). [6] D'Angelo, D., et al. "HMGA2: a multifaceted protein in cancer." Frontiers in Oncology (2018).

Other names

HMGI-CHigh-mobility group protein HMGI-CHMGA2-DNA interactionHMGA2-chromatin complex

Competitive inhibition of DNA binding by small molecules that occupy the minor groove of AT-rich DNA sequences, thereby displacing the HMGA2 protein from its genomic targets.