THE DIRECTORY OF P450-CONTAINING SYSTEMS IN 1996

The Directory of P450-containing Systems on World-Wide Web has been de signed to facilitate access to electronic resources for all researcher s working in the field of P450-containing and related enzyme systems. Currently, it contains the most up-to-date list of sequences of both t he P450 superfamily and proteins mediating electron transfer to P450, i.e. NADPH:P450 reductases, specific NAD(P)H:ferredoxin reductases, cy tochrome b(5) reductases, ferredoxins and cytochromes b(5), and their homologues. All the referenced sequences are provided with accession n umbers and links to major sequence databanks: PIR, SWISS-PROT, EMBL/Ge nBank and PRF. An associated database of steroid substrates and produc ts of P450-dependent reactions has also been developed.