title: Identification of a unique membrane receptor for adenosine 5',5"'-P1,P4-tetraphosphate.
abstract: Adenosine 5',5"'-P1,P4-tetraphosphate (Ap4A) has been implicated as a modulator of cell stress. We have performed binding studies which indicate that membranes from all tissues tested bind tritium-labeled Ap4A. The characteristics of Ap4A binding were determined on brain membrane homogenates after development of an optimized in vitro filter-binding assay. Ap4A binding is specific for adenylated dinucleotides and for the length of the phosphate bridge. A Kd of 0.71 microM for Ap4A was determined.
authors.affiliation: Department of Biological Sciences, Clemson University, South Carolina 29634-1903.
authors.forename: R H
authors.initials: RH
authors.lastname: Hilderman
authors.forename: M
authors.initials: M
authors.lastname: Martin
authors.forename: J K
authors.initials: JK
authors.lastname: Zimmerman
authors.forename: E B
authors.initials: EB
authors.lastname: Pivorun
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism; D002352:Carrier Proteins / Q000302:isolation & purification / Q000378:metabolism*; D002412:Cations; D002462:Cell Membrane / Q000378:metabolism*; D015226:Dinucleoside Phosphates / Q000378:metabolism*; D007700:Kinetics; D009928:Organ Specificity; D010542:Peromyscus; D013379:Substrate Specificity
chemical_list: D002352:Carrier Proteins; D002412:Cations; D015226:Dinucleoside Phosphates; C020733:diadenosine tetraphosphate