Adenosine, 20-deoxyadenosine, adenine, 9-b-D-arabinofuranosyladenine
(ara-A), and IPTG were from Sigma/Aldrich. 20-Deoxycoformycin
and coformycin were provided by Dr. Robert J.
Suhadolnik, Temple University School of Medicine (USA). Nickelagarose
was from Qiagen. S. coelicolor A3(2) was a generous gift
from Dr. Keith Chater, John Innes Institute (UK). E. coli strain
BL21 (DE3) and pET-15b were from Novagen.