... ofalmost all naturally occurring osmolytes. We reporthere that protein stability and activity are not largelycoupled in the presence of osmolytes. However, proteinstability and activity have ... yield and activity of human phenylalanine hydroxylase mutantenzymes produced in a prokaryotic expression system.Mol Genet Metab 73, 173–178.9 Tanaka M, Machida Y & Nukina N (2005) A noveltherapeutic ... l-lysine, l-serine, b-alanine, taurine, sarcosine,dimethylglycine, glycine betaine, trimethylamine N-oxide, and cytidine 2¢-3¢ cyclic monophosphate were also obtainedfrom Sigma. These and other...