Overview
Cyclin D is a family of proteins (D1, D2, D3) that play a pivotal role in the progression of the cell cycle, particularly during the G1 phase. These proteins form complexes with cyclin-dependent kinases (CDK4/6) to phosphorylate retinoblastoma protein (Rb), thereby promoting cell cycle progression. Cyclin D is highly conserved across species and is essential for normal cellular proliferation. In research, Cyclin D is widely used to study cell cycle regulation, cancer mechanisms, and potential therapeutic targets. Dysregulation of Cyclin D expression is associated with various cancers, making it a critical biomarker in oncology studies. Its isoforms (D1, D2, D3) exhibit tissue-specific expression patterns, adding complexity to its functional analysis.
Physical and Chemical Properties
Cyclin D is typically supplied as a lyophilized powder or in liquid buffer solutions, with a molecular weight ranging between 34-36 kDa depending on the isoform. It is soluble in aqueous buffers and stable under recommended storage conditions (-20°C or -80°C). The protein's activity is highly dependent on its tertiary structure, which can be affected by improper handling or storage. Unlike small molecules, Cyclin D does not have defined melting or boiling points. Its stability is influenced by pH, temperature, and the presence of protease inhibitors. For experimental use, reconstitution in appropriate buffers (e.g., PBS or Tris-HCl) is necessary to maintain functionality. Purity is typically assessed via SDS-PAGE or HPLC, with ≥90% purity recommended for most applications.
Main Applications
Cyclin D is primarily used in biomedical research, particularly in studies focusing on cell cycle regulation and cancer biology. Its overexpression is linked to uncontrolled cell proliferation, making it a target for anticancer drug development. Researchers use Cyclin D to investigate signaling pathways involving CDK4/6 inhibitors, which are FDA-approved for certain cancers. Beyond oncology, Cyclin D is employed in developmental biology to understand tissue growth and differentiation. It is also a tool in high-throughput screening for drug discovery. In diagnostic applications, Cyclin D levels are measured as prognostic markers in cancers like breast cancer and mantle cell lymphoma.
Safety and Storage
Cyclin D should be handled under standard laboratory biosafety conditions (BSL-1 or BSL-2). While it is not classified as highly hazardous, direct contact with skin or eyes should be avoided. Use personal protective equipment (PPE) such as gloves and lab coats during handling. For storage, lyophilized Cyclin D is stable at -20°C or -80°C for extended periods. Reconstituted solutions should be aliquoted to avoid repeated freeze-thaw cycles, which can degrade the protein. Always check the manufacturer's recommendations for buffer composition and storage duration. Dispose of waste according to institutional guidelines for biological materials.
B2B Procurement Guide
When procuring Cyclin D for research or industrial use, prioritize suppliers with certifications (e.g., ISO 9001) and proven track records in protein production. Key specifications to verify include purity (≥90%), activity (e.g., kinase assay data), and endotoxin levels (<1 EU/μg for cell culture applications). Consider the source (recombinant vs. native) and species specificity (e.g., mouse, human) based on your experimental needs. Bulk purchases may offer cost savings, but ensure proper storage capacity. For critical applications, request lot-specific data and consider third-party validation. Lead times can vary; plan orders in advance to avoid project delays.
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