Welcome to ODB

ODB (Operon DataBase) aims to collect known and conserved operons in multiple species. All the known operons are derived from the literature and from publicly available database including operon information. We will collect as many operons (transcriptional units) as possible from as many organisms as possible. As for the concept of reference operons, our system provides candidates of operons based on the orthologous genes conserved in the genomes. This database integrates both known literature-based operons as well as predicted well-conserved operons, to provide a useful system for bioinformatics researchers and experimental biologists.

Statistics of ODB

Number of operonNumber of genesNumber of genomes
Known operon98902341556
Conserved operon4151936493141136
Reference operon48128537091137


  1. Okuda, S. and Yoshizawa, A.C.; ODB: a database for operon organizations, 2011 update. Nucleic Acids Res.39(Database issue):D552-555 (2011). [pubmed]
  2. Okuda S, Katayama T, Kawashima S, Goto S, and Kanehisa M.; ODB: a database of operons accumulating known operons across multiple genomes. Nucleic Acids Res. 34(Database issue):D358-362 (2006).[pubmed]

Previous release

ODB version 1 is here.