title: Influence of zinc ions addition to different lots of 2-amino-2-methyl-1-propanol (AMP) buffer on the alkaline phosphatase activities.
abstract: The influence of Zn2+ on the inactivation of alkaline phosphatase [orthophosphoric monoester phosphohydrolase (alkaline optimum), EC 3.1 3.1] in serum during preincubation with 2-amino-2-methyl-1-propanol (AMP) buffers was investigated. Addition of Zn2+ to the buffer before preincubation increases the enzyme activity. An optimum Zn2+ concentration different for each lot of AMP buffer can be found, at which the enzyme activities are restored to a level equal to activities measured without preincubation. There is a relation between the inactivating properties of the different AMP buffers and the amount of Zn2+ needed to prevent this inactivation. Since Zn2+ chelating substituted diamines are held responsible for the inactivation by removing Zn2+ from the enzyme, we assume that the addition of Zn2+ to the buffer prevents this removal. As Zn2+ itself is an inhibitor of the enzyme, the addition of both too much or too little Zn2+ results in lower enzyme activities after preincubation with AMP buffer.
mesh_terms: D000469:Alkaline Phosphatase / Q000037:antagonists & inhibitors* / Q000097:blood; D002021:Buffers; D002614:Chelating Agents / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D006801:Humans; D011412:Propanolamines / Q000494:pharmacology*; D013997:Time Factors; D015032:Zinc / Q000494:pharmacology*
chemical_list: D002021:Buffers; D002614:Chelating Agents; D011412:Propanolamines; D000469:Alkaline Phosphatase; D015032:Zinc