http://purl.uniprot.org/enzyme/4.4.1.21 | http://www.w3.org/2000/01/rdf-schema#comment | "The 4,5-dihydroxypentan-2,3-dione formed spontaneously cyclizes and combines with borate to form an autoinducer (AI-2) in the bacterial quorum-sensing mechanism, which is used by many bacteria to control gene expression in response to cell density."xsd:string |