title: Activation of murine RNase L by isopolar 2'-phosphonate analogues of 2',5' oligoadenylates.
abstract: To determine the influence of methylene group insertion in the internucleotide linkage on the binding process of 2',5'-oligoadenylates to RNase L, a series of 2'-phosphonate-modified trimers and tetramers were synthesized from appropriate monomeric units and evaluated for their ability to bind to murine RNase L. Tetramers pAAXA modified by ribo-, arabino-, or xylo-2'-phosphonate unit X in the third position were capable of binding to RNase L in nanomolar concentrations. The replacement of the first residue (pXAAA), or both the first and the third residues (pXAXA), was also tolerated by the enzyme. In contrast, in all cases, the replacement of the second residue (pAXAA) resulted in the significant decrease of binding ability. Additionally, no more than two phosphonate modifications in the tetramer were allowed to retain the binding affinity to the enzyme. Although all three tetramers pAAXA were found to be potent enzyme binders, only tetramers modified by ribo- and xylo-2'-phosphonate unit X activated the RNase L-catalyzed cleavage of the RNA substrate. Surprisingly, tetramer pAAXA, modified by arabino-2'-phosphonate unit X, did not activate the enzyme and can be considered a potent antagonist. In comparison with their natural counterpart, the phosphonate analogues of the pA4 exhibit superior resistance toward nucleases present in the murine spleen homogenate.
authors.affiliation: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic.
authors.forename: Ondrej
authors.initials: O
authors.lastname: Pav
authors.forename: Eva
authors.initials: E
authors.lastname: Protivinska
authors.forename: Martina
authors.initials: M
authors.lastname: Pressova
authors.forename: Michaela
authors.initials: M
authors.lastname: Collinsova
authors.forename: Jiri
authors.initials: J
authors.lastname: Jiracek
authors.forename: Jan
authors.initials: J
authors.lastname: Snasel
authors.forename: Milena
authors.initials: M
authors.lastname: Masojidkova
authors.forename: Milos
authors.initials: M
authors.lastname: Budesinsky
authors.forename: Ivan
authors.initials: I
authors.lastname: Rosenberg
mesh_terms: D000227:Adenine Nucleotides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D004722:Endoribonucleases / Q000378:metabolism*; D066298:In Vitro Techniques; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009843:Oligoribonucleotides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D063065:Organophosphonates / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011485:Protein Binding; D013154:Spleen / Q000201:enzymology; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D000227:Adenine Nucleotides; D009843:Oligoribonucleotides; D063065:Organophosphonates; C023505:2',5'-oligoadenylate; D004722:Endoribonucleases; C031956:2-5A-dependent ribonuclease