| Abstract: | The initial velocity and the extent of aminoacylation are affected by sodium chloride in the lupin aminoacylation systems involving serine, isoleucine, lysine, leucine, phenylalanine and valine. Pyrophosphorolysis and enzymatic hydrolysis of 14C]Val-tRNA catalysed by lupin valyl-tRNA synthetase are inhibited by sodium chloride nearly to the same extent. Evidence is presented that when a limiting amount of synthetase is used, the equilibrium of the aminoacylation reaction in the lupin valine system is determined only by the rate of aminoacylation and non-enzymatic deacylation of aminoacyl-tRNA, the former but not the latter reaction being dependent on concentration of the enzyme and monovalent salt. |
