Brenda Database

If you're doing biochemical research or metabolic engineering and need enzyme data, this gives you programmatic access to BRENDA, the most comprehensive enzyme database out there. You can query kinetic parameters like Km and kcat values, pull reaction equations, compare enzyme properties across organisms, and find enzymes for specific substrates or transformations. It uses the official SOAP API to access millions of data points covering 45,000+ enzymes. The real value is in the substrate specificity comparisons and organism-specific data, which saves you from manually parsing literature when you're trying to find the right enzyme variant or optimize reaction conditions. Solid tool if you're building metabolic pathways or doing enzyme discovery work.