Cysteine-rich transcription factors

Cysteine-rich transcription factors are a broad class of regulatory proteins characterized by the presence of cysteine-rich domains, such as LIM, CXC, or zinc-finger motifs, which are essential for DNA binding or protein-protein interactions (4.2.1, 5.1.1). Prominent members include the LIM domain only (LMO) family, which acts as oncogenic scaffolds in neuroblastoma and T-cell acute lymphoblastic leukemia, and the Cysteine-rich Polycomb-like Protein (CPP) family, including NFX1, which regulates the expression of MHC class II genes and telomerase (hTERT) (4.2.3, 5.1.1, 5.4.2). These factors play pivotal roles in cell cycle progression, hematopoiesis, and the cellular response to oxidative stress (4.1.2, 5.3.2). While they are considered high-priority therapeutic targets due to their involvement in tumor initiation and viral pathogenesis (e.g., HPV-induced cancers), they are challenging to target specifically with small molecules (5.3.4, 6.2.1). Some drugs, such as arsenic trioxide, are known to interact with cysteine-rich motifs in transcription factors to induce their degradation or inhibit their function (4.1.2, 5.2.1).

Other names

LIM domain only (LMO) familyCysteine-rich Polycomb-like Protein (CPP) familyTesmin/TSO1-like CXC proteinsNuclear transcription factor X-box binding 1 (NFX1)Zinc-finger transcription factorsRedox-sensitive transcription factors

Modulation of gene expression through DNA binding (via CXC or zinc-finger domains) or protein-protein scaffolding (via LIM domains); some drugs act by reacting with or coordinating to the cysteine residues to disrupt protein folding or activity.