Overview
Maturation Promoting Factor (MPF) is a heterodimeric protein complex first identified in amphibian oocytes that controls entry into mitosis. It consists of two subunits: the catalytic cyclin-dependent kinase 1 (CDK1) and the regulatory cyclin B. MPF's discovery by Masui and Markert in 1971 revolutionized cell cycle research, earning it the nickname 'master regulator' of mitosis. In eukaryotes, MPF activity peaks during the G2/M transition, triggering critical mitotic events like chromosome condensation and nuclear membrane dissolution. Its periodic activation and inactivation through cyclin synthesis/degradation exemplify the biochemical oscillators governing cell division cycles.
Physical and Chemical Properties
As a protein complex, MPF exhibits temperature-dependent activity with optimal function at 37°C for mammalian variants. The CDK1 subunit requires phosphorylation at Thr161 for activation while inhibitory phosphorylations at Thr14/Tyr15 must be removed by Cdc25 phosphatases. Cyclin B binding induces conformational changes exposing CDK1's active site. The complex has an isoelectric point around 6.5-7.0 and is typically stored in glycerol-containing buffers to prevent aggregation. Commercial preparations often include stabilizing agents like protease inhibitors. Activity is commonly measured through histone H1 kinase assays or via fluorescence-based CDK1 activity sensors in live cells.
Main Applications
MPF is indispensable in cell cycle research, particularly for studying checkpoint mechanisms and mitotic entry. In developmental biology, it's used to induce oocyte maturation in vitro, a technique applied in IVF and cloning procedures. Cancer researchers investigate MPF dysregulation as many tumors show altered CDK1/cyclin B expression patterns. Pharmaceutical applications include screening CDK1 inhibitors as potential anticancer drugs. Some studies utilize MPF activity measurements as biomarkers for cell proliferation status. In educational settings, Xenopus MPF extracts demonstrate cell cycle control principles due to their high concentration and stability.
Safety and Storage
Recombinant MPF requires biosafety level 2 handling due to potential endotoxin contamination and the oncogenic nature of cell cycle regulators. Always use gloves and eye protection when handling lyophilized powders or concentrated solutions. Avoid inhalation of aerosols during reconstitution. For long-term storage, aliquot the protein in single-use volumes at -80°C with cryoprotectants like 10-20% glycerol. Working solutions can be kept at 4°C for up to 1 week with protease inhibitors. Avoid repeated freeze-thaw cycles which cause activity loss. Shipping should be done on dry ice with temperature tracking for active products.
B2B Procurement Guide
When sourcing MPF for research, prioritize vendors providing detailed certificates of analysis including specific activity (units/mg) and purity (SDS-PAGE verification). Key specifications include species origin (human, mouse, Xenopus), whether it's native or recombinant, and presence of post-translational modifications. For cell culture applications, ensure endotoxin levels are <1 EU/µg. Bulk orders for drug screening may qualify for volume discounts—negotiate with suppliers like Sigma-Aldrich, Abcam, or Cell Signaling Technology. Consider custom production services for isotope-labeled variants used in structural studies. Lead times typically range 2-4 weeks for specialty items.
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