Overview
Granulysin is a small protein secreted by cytotoxic T lymphocytes (CTLs) and natural killer (NK) cells. It was first identified in the late 1990s and is encoded by the GNLY gene. The protein exists in multiple isoforms, with the 9 kDa and 15 kDa forms being the most studied. Granulysin is stored in cytotoxic granules alongside perforin and granzymes, released upon immune cell activation to target infected or malignant cells. Its primary role is to induce apoptosis in target cells and eliminate intracellular pathogens, including bacteria, fungi, and parasites. Granulysin’s dual function—direct microbial killing and immune modulation—makes it a promising candidate for therapeutic applications, particularly in oncology and infectious diseases.
Physical and Chemical Properties
Granulysin is a cationic protein with a high isoelectric point, enabling it to interact with negatively charged microbial membranes. The 9 kDa isoform is the mature, active form derived from proteolytic cleavage of the 15 kDa precursor. It exhibits stability across a range of pH levels but degrades under prolonged exposure to high temperatures or proteolytic enzymes. Structurally, granulysin shares homology with saposin-like proteins, featuring a conserved three-dimensional fold critical for membrane disruption. Its solubility in aqueous buffers facilitates laboratory use, though aggregation may occur at high concentrations. Analytical techniques like SDS-PAGE and mass spectrometry are typically employed to verify its purity and molecular weight.
Main Applications
In biomedical research, granulysin is studied for its potential in immunotherapy, particularly against drug-resistant infections and cancers. Its ability to lyse Mycobacterium tuberculosis and other pathogens has spurred interest in novel antimicrobial therapies. In oncology, granulysin’s tumoricidal activity is being explored for targeted cancer treatments, either alone or in combination with checkpoint inhibitors. Additionally, granulysin serves as a biomarker for certain immune responses. Elevated levels are associated with graft-versus-host disease (GVHD) and autoimmune conditions, making it a diagnostic tool in transplant medicine. Commercial applications include recombinant granulysin production for research kits and therapeutic development pipelines.
Safety and Storage
As a bioactive protein, granulysin requires careful handling to maintain stability and prevent degradation. Lyophilized forms should be reconstituted in sterile, endotoxin-free buffers and aliquoted to avoid repeated freeze-thaw cycles. Long-term storage at -80°C is recommended for extended shelf life. Safety protocols include wearing gloves, lab coats, and eye protection when handling the protein, as it may cause irritation upon contact. Researchers should verify endotoxin levels in commercial preparations, as contaminants can skew experimental results. Disposal should follow institutional guidelines for biohazardous materials.
B2B Procurement Guide
When sourcing granulysin for research or development, prioritize suppliers with certified quality control (e.g., ISO 9001). Key specifications to confirm include purity (≥95%), endotoxin levels (<1 EU/μg), and functional activity (e.g., cytotoxicity assays). Bulk purchases may qualify for discounts but require validation of batch-to-batch consistency. For therapeutic applications, ensure compliance with Good Manufacturing Practice (GMP) standards. Lead times can vary; advance planning is advised for custom orders like labeled or modified variants. Negotiate supply agreements to secure pricing and delivery terms, especially for high-volume needs.
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