Novel hydrolysis-resistant analogues of cyclic ADP-ribose: modification of the "northern" ribose and calcium release activity.
Three novel analogues modified in the "northern" ribose (ribose linked to N1 of adenine) of the Ca(2+) mobilizing second messenger cyclic adenosine diphosphoribose, termed 2"-NH(2)-cyclic adenosine diphosphoribose, cyclic adenosine diphospho-carbocyclic-ribose, and 8-NH(2)-cyclic adenosine diphospho-carbocyclic-ribose, were synthesized (chemoenzymatically and by total synthesis) and spectroscopically characterized, and the pK(a) values for the 6-amino/imino transition were determined in two cases. The biological activity of these analogues was determined in permeabilized human Jurkat T-lymphocytes. 2"-NH(2)-cyclic adenosine diphosphoribose mediated Ca(2+) release was slightly more potent than that of the endogenous cyclic adenosine diphosphoribose in terms of the concentration-reponse relationship. Both compounds released Ca(2+) from the same intracellular Ca(2+) pool. In addition, the control compound 2"-NH(2)-adenosine diphosphoribose was almost without effect. In contrast, only at much higher concentrations (> or =50 microM) did the "northern" carbocyclic analogue, cyclic adenosine diphospho-carbocyclic-ribose, significantly release Ca(2+) from permeabilized T cells, whereas the previously reported "southern" carbocyclic analogue, cyclic aristeromycin diphosphoribose, was slightly more active than the endogenous cyclic adenosine diphosphoribose. Likewise, 8-NH(2)-cyclic adenosine diphospho-carbocyclic-ribose, expected to antagonize Ca(2+) release as demonstrated previously for 8-NH(2)-cyclic adenosine diphosphoribose, did not inhibit cyclic adenosine diphosphoribose mediated Ca(2+) release. This indicates that the 2"-NH(2)-group substitutes well for the 2"-OH-group it replaces; it may be oriented toward the outside of the putative cyclic adenosine diphosphoribose receptor binding domain and/or it can potentially also engage in H bonding interactions with residues of that domain. In sharp contrast to this, replacement of the endocyclic furanose oxygen atom by CH(2) in a carbocyclic system obviously interferes with a crucial element of interaction between cyclic adenosine diphosphoribose and its receptor in T-lymphocytes.
Guse
Andreas H
AH
Institute for Medical Biochemistry and Molecular Biology, Division of Cellular Signal Transduction, University Hospital Hamburg-Eppendorf, Martinistrasse 52, D-20246 Hamburg, Germany. guse@uke.uni-hamburg.de
Cakir-Kiefer
Céline
C
Fukuoka
Masayoshi
M
Shuto
Satoshi
S
Weber
Karin
K
Bailey
Victoria C
VC
Matsuda
Akira
A
Mayr
Georg W
GW
Oppenheimer
Norman
N
Schuber
Francis
F
Potter
Barry V L
BV
D000246:Adenosine Diphosphate Ribose / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D001692:Biological Transport; D002118:Calcium / Q000378:metabolism*; D036563:Cyclic ADP-Ribose / Q000031:analogs & derivatives*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D006868:Hydrolysis; D019169:Jurkat Cells; D007700:Kinetics; D015290:Second Messenger Systems / Q000502:physiology*
C439996:cyclic ADP-carbocyclic-ribose; D036563:Cyclic ADP-Ribose; D000246:Adenosine Diphosphate Ribose; D002118:Calcium