title: Studies on some specific Ap4A-degrading enzymes with the use of various methylene analogues of P1P4-bis-(5',5'''-adenosyl) tetraphosphate.
abstract: Six new methylenephosphonate analogues of P1P4-bis-(5',5'''-adenosyl) tetraphosphate, Ap4A, having P2-P3 carbon bridges CF2, CCl2 and CH2CH2 or P1-P2 and P3-P4 carbon bridges CF2, CCl2 and CH2CH2 in the tetraphosphate chain, were examined as substrates or inhibitors for two specific Ap4A-degrading enzymes: (asymmetrical) Ap4A hydrolase (EC 3.6.1.17) from yellow-lupin seeds and (symmetrical) Ap4A hydrolase (EC 3.6.1.41) from Escherichia coli. All analogues in which the central oxygen atom was replaced by a stable carbon bridge were hydrolysed by the asymmetrical hydrolase (CF2 greater than CCl2 greater than O greater than CHBr greater than CH2 greater than CH2CH2). As expected, these analogues were not hydrolysed by the symmetrical hydrolase, which was also unable to act on analogues having P1-P2 and P3-P4 carbon bridges.
authors.affiliation: Katedra Biochemii, Akademia Rolnicza, Poznań, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Guranowski
authors.forename: E
authors.initials: E
authors.lastname: Starzyńska
authors.forename: G E
authors.initials: GE
authors.lastname: Taylor
authors.forename: G M
authors.initials: GM
authors.lastname: Blackburn
mesh_terms: D017766:Acid Anhydride Hydrolases; D015226:Dinucleoside Phosphates / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology; D007700:Kinetics; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism; D010744:Phosphoric Monoester Hydrolases / Q000378:metabolism; D012639:Seeds / Q000201:enzymology
chemical_list: D015226:Dinucleoside Phosphates; C020733:diadenosine tetraphosphate; D010744:Phosphoric Monoester Hydrolases; D010727:Phosphoric Diester Hydrolases; D017766:Acid Anhydride Hydrolases; C020023:bis(5'-nucleosyl)tetraphosphatase (asymmetrical); C036849:bis(5'-nucleosyl)tetraphosphatase (symmetrical)