title: Di(1,N6-ethenoadenosine)5', 5'''-P1,P4-tetraphosphate, a fluorescent enzymatically active derivative of Ap4A.
abstract: Di(1,N6-ethenoadenosine)5',5'''-P1,P4-tetraphosphate, epsilon-(Ap4A), a fluorescent analog of Ap4A has been synthesized by reaction of 2-chloroacetaldehyde with Ap4A. At neutral pH this Ap4A analog presents characteristics maxima at 265 and 274 nm, shoulders at ca 260 and 310 nm and moderate fluorescence (lambda exc 307 nm, lambda em 410 nm). Enzymatic hydrolysis of the phosphate backbone produced a slight hyperchromic effect but a notorious increase of the fluorescence emission. Cytosolic extracts from adrenochromaffin tissue as well as cultured chromaffin cells were able to split epsilon(Ap4A) and catabolize the resulting epsilon-nucleotide moieties up to epsilon-Ado.
authors.affiliation: Departamento de Bioquimica y Biologia Molecular, Universidad de La Laguna, Tenerife, Canary Islands, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Rotilán
authors.forename: A
authors.initials: A
authors.lastname: Ramos
authors.forename: J
authors.initials: J
authors.lastname: Pintor
authors.forename: M
authors.initials: M
authors.lastname: Torres
authors.forename: M T
authors.initials: MT
authors.lastname: Miras-Portugal
mesh_terms: D000313:Adrenal Medulla / Q000201:enzymology; D000818:Animals; D002417:Cattle; D002478:Cells, Cultured; D002837:Chromaffin Granules / Q000378:metabolism; D015226:Dinucleoside Phosphates / Q000138:chemical synthesis* / Q000737:chemistry* / Q000378:metabolism; D010450:Endopeptidases / Q000378:metabolism; D005456:Fluorescent Dyes; D006868:Hydrolysis; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013379:Substrate Specificity
chemical_list: D015226:Dinucleoside Phosphates; D005456:Fluorescent Dyes; C020733:diadenosine tetraphosphate; C068203:di(1,N(6)-ethenoadenosine)-5',5'''-P(1),P(4)-tetraphosphate; D010450:Endopeptidases