Overview
NAD-dependent malic enzyme (NAD-ME) is a metabolic enzyme that converts malate into pyruvate, generating NADH and CO2 in the process. It is distinct from NADP-dependent isoforms and is found in mitochondria of eukaryotes and certain bacteria. The enzyme is critical for linking the tricarboxylic acid (TCA) cycle with glycolysis and lipid biosynthesis. First identified in the 1950s, NAD-ME has since been characterized in diverse species, including plants (C4 photosynthesis), animals (energy metabolism), and pathogens (virulence). Its regulation involves allosteric effectors like ATP and succinate, making it a target for metabolic engineering.
Physical and Chemical Properties
NAD-ME typically functions as a homotetramer or homodimer, with subunit molecular weights ranging from 60-70 kDa. The enzyme requires divalent cations (Mn2+ or Mg2+) for activity and exhibits optimal pH between 7.0 and 8.0. Kinetic studies reveal Km values for malate in the millimolar range. Thermostability varies by source; bacterial enzymes often tolerate higher temperatures than eukaryotic counterparts. The enzyme is sensitive to oxidation and loses activity upon prolonged exposure to air. Lyophilized formulations are preferred for long-term storage.
Main Applications
In biotechnology, NAD-ME is used to engineer metabolic pathways for enhanced biofuel (e.g., ethanol, butanol) production. Its ability to generate NADH makes it valuable for redox balancing in industrial fermentation. Diagnostically, NAD-ME activity assays help study mitochondrial disorders and cancer metabolism. Plant biologists employ the enzyme to improve C4 crop yields, while microbiologists explore its role in pathogen energy metabolism for drug development.
Safety and Storage
NAD-ME poses minimal hazard under normal handling conditions. Use standard laboratory PPE (gloves, goggles) to avoid contamination. Spills should be rinsed with water. For storage, lyophilized powder remains stable for years at -20°C. Reconstituted solutions retain activity for weeks at 4°C with protease inhibitors. Avoid repeated freeze-thaw cycles. Shipping typically requires cold packs or dry ice for international orders.
B2B Procurement Guide
When sourcing NAD-ME, prioritize suppliers providing certificates of analysis (CoA) with verified activity (U/mg) and purity (>90% by SDS-PAGE). Recombinant versions (e.g., E. coli-expressed) offer consistency for industrial applications. Bulk buyers should negotiate pricing for quantities above 100 mg. Lead times vary; specialty isoforms (e.g., plant NAD-ME) may require custom production. Consider regulatory requirements (e.g., GMP-grade for diagnostics) and request stability data for logistics planning.
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