This resource is powered by the Protein Data Bank archive-information about the 3D shapes of proteins, nucleic acids, and complex assemblies that helps students and researchers understand all aspects of biomedicine and agriculture, from protein synthesis to health and disease. (from the website)
MACiE, which stands for Mechanism, Annotation and Classification in Enzymes, is a collaborative project between the Thornton Group at the European Bioinformatics Institute and the Mitchell Group at the University of St Andrews.
MACiE contains 335 fully annotated enzyme reaction mechanisms, which comprise 321 EC numbers (182 EC sub-subclasses) and 372 distinct CATH codes.
The National Center for Biotechnology Information (NCBI) is part of the United States National Library of Medicine (NLM), a branch of the National Institutes of Health (NIH). NCBI provides free access to a large collection of biomedical and genomic databases, plus analytical tools.
Open chemistry database from National Center for Biotechonlogy Information a branch of National Library of Medicine under National Institute of Health (NIH). The database primarily contains information about small molecules.