Overview
STN1 is a conserved protein that forms part of the CST complex alongside CTC1 and TEN1. Originally identified for its role in telomere maintenance, it is now recognized as a multifunctional complex involved in DNA replication and repair across eukaryotes. The CST complex resembles the replication protein A (RPA) complex but operates specifically at telomeres and certain genomic loci. STN1’s primary function is to bind single-stranded DNA (ssDNA), facilitating the recruitment of polymerase α-primase to initiate DNA synthesis. This activity is critical for both telomere elongation (via the alternative lengthening of telomeres pathway) and general replication restart at stalled forks. Mutations in STN1 or its partner proteins are linked to telomere dysfunction and diseases like Coats plus syndrome.
Key Features
STN1 contains an OB-fold domain, a common structural motif in ssDNA-binding proteins, which enables its interaction with DNA. It also features protein-protein interaction surfaces for binding CTC1 and TEN1, forming a stable heterotrimeric complex. The CST complex competes with RPA to bind telomeric ssDNA, ensuring telomere-specific regulation. Notably, STN1 exhibits species-specific variations in function. In humans, it is essential for preventing telomere attrition and genomic instability, while in yeast, it plays additional roles in subtelomeric silencing. Its expression levels are tightly regulated, and dysregulation has been observed in certain cancers, making it a potential biomarker or therapeutic target.
Application Areas
STN1 is widely studied in molecular biology for its role in telomere biology and replication stress responses. Researchers use recombinant STN1 proteins or antibodies in assays like chromatin immunoprecipitation (ChIP) and electrophoretic mobility shift assays (EMSAs) to investigate DNA-protein interactions. In medical research, STN1 mutations are analyzed in the context of telomere syndromes and cancer. For example, deficiencies in the CST complex lead to aberrant telomere lengthening, a hallmark of some aggressive tumors. Pharmaceutical studies explore CST inhibition as a strategy to target cancer cells with alternative telomere maintenance mechanisms.
Precautions
When working with STN1 in laboratory settings, standard biosafety level (BSL) 1 or 2 practices apply, depending on the experimental context. Recombinant proteins should be stored at -80°C to prevent degradation, and freeze-thaw cycles must be minimized. For antibody-based detection, validate specificity using knockout controls to avoid off-target signals. Cross-reactivity between species (e.g., human vs. mouse STN1) should be confirmed if working across models. Commercial kits for CST complex studies often include proprietary buffers; follow manufacturer protocols for optimal results.
B2B Procurement Guide
Research-grade STN1 proteins, antibodies, and cDNA clones are available from specialized vendors like Sigma-Aldrich, Abcam, and Thermo Fisher Scientific. Prices vary by purity (e.g., >90% for assays) and conjugation (e.g., His-tag, GFP-tag). Bulk orders for high-throughput screens may qualify for discounts. For reproducibility, request batch-specific certificates of analysis detailing concentration, endotoxin levels, and activity assays. Consider partnering with suppliers offering custom services (e.g., mutant variants) for tailored projects. Lead times for recombinant proteins can range from 2-6 weeks, so plan experiments accordingly.
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