title: Phosphohistidine and phospholysine phosphatase activities in the rat: potential protein-lysine and protein-histidine phosphatases?
abstract: We have detected phosphohistidine and phospholysine phosphatase activities in rat tissue extracts using partially phosphorylated, high-molecular-mass (> 10 kDa) polymers of histidine and lysine as substrates. Multiple phosphohistidine- and phospholysine-specific phosphatases were present in these extracts based on observed differences in heat stability, sensitivity to bivalent metal ions and thiol modifying reagents, and/or elution from DE-52 cellulose. The properties of these phosphohistidine and phospholysine phosphatases were distinct from those of the phosphomonoester-specific protein phosphatases or the N-P phosphohydrolases that act on the free phosphoamino acids phosphoarginine, 3-phosphohistidine or phospholysine.
authors.affiliation: Department of Biochemistry and Anaerobic Microbiology, Virginia Polytechnic Institute and State University, Blacksburg 24061-0308.
authors.forename: C
authors.initials: C
authors.lastname: Wong
authors.forename: B
authors.initials: B
authors.lastname: Faiola
authors.forename: W
authors.initials: W
authors.lastname: Wu
authors.forename: P J
authors.initials: PJ
authors.lastname: Kennelly
mesh_terms: D000818:Animals; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D003600:Cytosol / Q000201:enzymology; D004795:Enzyme Stability; D007700:Kinetics; D008297:Male; D008970:Molecular Weight; D009928:Organ Specificity; D010749:Phosphoprotein Phosphatases / Q000302:isolation & purification / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013816:Thermodynamics
chemical_list: D010749:Phosphoprotein Phosphatases