Journal
FEBS LETTERS
Volume 534, Issue 1-3, Pages 75-81Publisher
WILEY
DOI: 10.1016/S0014-5793(02)03781-X
Keywords
coffee; caffeine; N-methyltransferase; 7-methylxanthine; S-adenosyl-L-methionine; theobromine
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In coffee and tea plants, caffeine is synthesized from xanthosine via a pathway that includes three methylation steps. We report the isolation of a bifunctional coffee caffeine synthase (CCS1) clone from coffee endosperm by reverse transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) technique using previously reported sequence information for theobromine synthases (CTSs). The predicted amino acid sequences of CCS1 are more than 80% identical to CTSs and are about 40% similar to those of tea caffeine synthase (TCS1). Interestingly, CCS1 has dual methylation activity like tea TCS1. (C) 2002 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.
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