The first enzymatic method for C-F-18 bond formation: the synthesis of 5 ‘-[F-18]-fluoro-5 ‘ deoxyadenosine for imaging with PET

The use of the key enzyme involved in carbon-fluorine bond formation in Streptomyces cattleya catalysing the formation of 5′-fluoro-5′-deoxyadenosine (5′-FDA) from fluoride ion and S-adenosyl-L-methionine (SAM) was explored for its potential application in fluorine-18 labelling of the adenosine derivative. Enzymatic radiolabelling of [F-18]-5′-FDA was successfully carried out starting from SAM and [F-18]HF when the concentration of the enzyme preparation was increased from sub-mg/ml values to mg/ml values. The purity of the enzyme had no measurable effect on the radiochemical yield of the reaction and the radiochemical purity of [F-18]-5′-FDA. Copyright (C) 2003 John Wiley Sons, Ltd.