title: Purification, immunological and biochemical characterization of Ap4A binding protein from Xenopus laevis oocytes.
abstract: Diadenosine 5',5'''-P1,P4-tetraphosphate (Ap4A) binding protein specifically binds Ap4A. The protein has been purified from Xenopus laevis oocytes and presents an estimated molecular weight of 100,000 by gel filtration. In the first stages of the purification, the Ap4A binding activity is found associated to DNA polymerase alpha-DNA primase, forming heterogeneous high molecular weight complexes. A monoclonal antibody has been prepared against the purified Ap4A binding protein. The antibody partially neutralizes the Ap4A binding activity. Using the immunoblot technique, it has been shown that the antibody is able to recognize either native or SDS-denatured Ap4A binding protein. The monoclonal antibody immunoreacted with a polypeptide of 90,000 which coincides with the molecular weight obtained by gel chromatography and indicates that the native Ap4A binding protein from Xenopus oocytes is probably a monomeric protein.
authors: Institut de Biochimie Cellulaire et Neurochimie, CNRS, Bordeaux, France.
authors: L
authors: L
authors: Zourgui
authors: D
authors: D
authors: Baltz
authors: T
authors: T
authors: Baltz
authors: F
authors: F
authors: Oukerro
authors: L
authors: L
authors: Tarrago-Litvak
mesh_terms: D000227:Adenine Nucleotides / Q000032:analysis / Q000276:immunology / Q000302:isolation & purification*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000502:physiology; D001666:Binding Sites, Antibody; D002352:Carrier Proteins / Q000032:analysis / Q000276:immunology / Q000302:isolation & purification*; D015226:Dinucleoside Phosphates; D005260:Female; D047908:Intracellular Signaling Peptides and Proteins; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D009865:Oocytes / Q000378:metabolism*; D011485:Protein Binding; D029867:Xenopus Proteins; D014982:Xenopus laevis / Q000378:metabolism*
chemical_list: D000227:Adenine Nucleotides; D000911:Antibodies, Monoclonal; C488946:Ap4A binding protein, Xenopus; D002352:Carrier Proteins; D015226:Dinucleoside Phosphates; D047908:Intracellular Signaling Peptides and Proteins; D029867:Xenopus Proteins; C020733:diadenosine tetraphosphate