TY - JOUR
T1 - Triazole double-headed ribonucleosides as inhibitors of eosinophil derived neurotoxin
AU - Chatzileontiadou, Demetra S.M.
AU - Parmenopoulou, Vanessa
AU - Manta, Stella
AU - Kantsadi, Anastassia L.
AU - Kylindri, Paroula
AU - Griniezaki, Marianna
AU - Kontopoulou, Filitsa
AU - Telopoulou, Aikaterini
AU - Prokova, Helena
AU - Panagopoulos, Dimitrios
AU - Boix, Ester
AU - Balatsos, Nikolaos A.A.
AU - Komiotis, Dimitri
AU - Leonidas, Demetres D.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - © 2015 Elsevier Inc. All rights reserved. Eosinophil derived neurotoxin (EDN) is an eosinophil secretion protein and a member of the Ribonuclease A (RNase A) superfamily involved in the immune response system and inflammatory disorders. The pathological actions of EDN are strongly dependent on the enzymatic activity and therefore, it is of significant interest to discover potent and specific inhibitors of EDN. In this framework we have assessed the inhibitory potency of triazole double-headed ribonucleosides. We present here an efficient method for the heterologous production and purification of EDN together with the synthesis of nucleosides and their biochemical evaluation in RNase A and EDN. Two groups of double-headed nucleosides were synthesized by the attachment of a purine or a pyrimidine base, through a triazole group at the 3′-C position of a pyrimidine or a purine ribonucleoside, respectively. Based on previous data with mononucleosides these compounds were expected to improve the inhibitory potency for RNase A and specificity for EDN. Kinetics data revealed that despite the rational, all but one, double-headed ribonucleosides were less potent than the respective mononucleosides while they were also more specific for ribonuclease A than for EDN. Compound 11c (9-[3′-[4-[(cytosine-1-yl)methyl]-1,2,3-triazol-1-yl]-β-d-ribofuranosyl]adenine) displayed a stronger preference for EDN than for ribonuclease A and a Ki value of 58 μM. This is the first time that an inhibitor is reported to have a better potency for EDN than for RNase A. The crystal structure of EDN-11c complex reveals the structural basis of its potency and selectivity providing important guidelines for future structure-based inhibitor design efforts.
AB - © 2015 Elsevier Inc. All rights reserved. Eosinophil derived neurotoxin (EDN) is an eosinophil secretion protein and a member of the Ribonuclease A (RNase A) superfamily involved in the immune response system and inflammatory disorders. The pathological actions of EDN are strongly dependent on the enzymatic activity and therefore, it is of significant interest to discover potent and specific inhibitors of EDN. In this framework we have assessed the inhibitory potency of triazole double-headed ribonucleosides. We present here an efficient method for the heterologous production and purification of EDN together with the synthesis of nucleosides and their biochemical evaluation in RNase A and EDN. Two groups of double-headed nucleosides were synthesized by the attachment of a purine or a pyrimidine base, through a triazole group at the 3′-C position of a pyrimidine or a purine ribonucleoside, respectively. Based on previous data with mononucleosides these compounds were expected to improve the inhibitory potency for RNase A and specificity for EDN. Kinetics data revealed that despite the rational, all but one, double-headed ribonucleosides were less potent than the respective mononucleosides while they were also more specific for ribonuclease A than for EDN. Compound 11c (9-[3′-[4-[(cytosine-1-yl)methyl]-1,2,3-triazol-1-yl]-β-d-ribofuranosyl]adenine) displayed a stronger preference for EDN than for ribonuclease A and a Ki value of 58 μM. This is the first time that an inhibitor is reported to have a better potency for EDN than for RNase A. The crystal structure of EDN-11c complex reveals the structural basis of its potency and selectivity providing important guidelines for future structure-based inhibitor design efforts.
KW - Double-headed nucleosides
KW - Eosinophil derived neurotoxin
KW - Inhibition
KW - Ribonuclease A
KW - Structure-assisted inhibitor design
KW - Triazole derivatives
KW - X-ray crystallography
U2 - 10.1016/j.bioorg.2015.10.007
DO - 10.1016/j.bioorg.2015.10.007
M3 - Article
SN - 0045-2068
VL - 63
SP - 152
EP - 165
JO - Bioorganic Chemistry
JF - Bioorganic Chemistry
ER -