Other Homo sapiens (human) protein
CAT No: ta-137
Synonyms/Alias:Carboxy-terminal domain RNA polymerase II polypeptide A small phosphatase 2
Carboxy-terminal domain RNA polymerase II polypeptide A small phosphatase 2 is a specialized enzyme that plays a pivotal role in the regulation of eukaryotic gene expression. As a member of the CTD phosphatase family, it specifically targets the carboxy-terminal domain (CTD) of RNA polymerase II, catalyzing the removal of phosphate groups from serine residues within the heptapeptide repeats. This post-translational modification exerts a profound influence on the transcription cycle, affecting initiation, elongation, and mRNA processing. The enzyme's ability to modulate the phosphorylation state of RNA polymerase II underscores its functional significance in the orchestration of transcriptional regulation and gene expression fidelity.
Transcriptional regulation studies: The enzyme is widely utilized in molecular biology research to dissect the mechanisms underlying gene expression control. By dephosphorylating specific residues on the CTD of RNA polymerase II, it enables researchers to study how dynamic phosphorylation patterns govern the recruitment of transcriptional machinery, the transition between different phases of transcription, and the integration of signaling pathways that influence gene output. Its use in in vitro and cell-based assays has provided valuable insights into the temporal and spatial regulation of transcription.
Chromatin and epigenetics research: Carboxy-terminal domain phosphatases such as this are instrumental in elucidating the interplay between transcriptional machinery and chromatin architecture. The enzyme's activity influences the association of chromatin remodelers and histone modifiers with the transcription complex, thereby affecting chromatin accessibility and epigenetic marking. Experimental manipulation of its activity allows scientists to probe the crosstalk between CTD phosphorylation states and chromatin dynamics, advancing the understanding of epigenetic regulation in eukaryotic cells.
Post-translational modification analysis: The phosphatase is frequently employed in studies focused on post-translational modifications of RNA polymerase II and associated factors. By providing a means to selectively remove phosphate groups from the CTD, it facilitates the mapping of phosphorylation sites and the characterization of downstream effects on protein-protein interactions. This application is particularly valuable in mass spectrometry-based proteomics, where precise control of phosphorylation status is essential for accurate identification and quantification of modification states.
Enzyme kinetics and inhibitor screening: Researchers leverage the enzyme in biochemical assays to investigate its catalytic properties and to screen for small molecule modulators. Detailed kinetic analyses help define substrate specificity, reaction mechanisms, and the influence of cofactors or regulatory proteins. In addition, the phosphatase serves as a target for inhibitor discovery campaigns, supporting the development of chemical probes that can modulate CTD phosphorylation and thereby alter transcriptional outputs in experimental systems.
Molecular tool for functional studies: The enzyme is also adopted as a molecular tool to manipulate the phosphorylation landscape of RNA polymerase II in reconstituted systems or cell extracts. Through controlled dephosphorylation, it enables functional interrogation of the roles played by specific phosphorylation events in transcription, mRNA processing, and the coordination of gene expression programs. This capability is essential for delineating the contribution of CTD phosphorylation dynamics to cellular responses and gene regulatory networks.
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