title: The role of Phe329 in binding of cationic triarylmethane dyes to human butyrylcholinesterase.
abstract: Cationic triarylmethane dyes (TAM(+))s which are used as colorants in industry and as frequent tools and reagents in analytical, cell biological and biomedical research have been recently characterized as reversible inhibitors of human butyrylcholinesterase. In this study, the inhibitory effects of two TAM(+)s, malachite green (MG) and methyl green (MeG) on five human BChE mutants (A277V, P285L, H77L, A328F and F329A) were studied spectrophotometrically at 25°C in 50mM MOPS buffer pH 8, using butyrylthiocholine as substrate. The kinetic results obtained with mutant enzymes were compared to those obtained with recombinant wild type BChE. MG and MeG were found to act as competitive/linear mixed inhibitors of recombinant wild type BChE and all BChE mutants except the F329A mutant. Both dyes caused complex nonlinear inhibition of F329A mutant, pointing to multisite binding. K(i) values for MG and MeG, estimated by nonlinear regression analysis, were 3.8 and 27 μM, respectively, as compared to the 50- to 150-fold lower values observed with recombinant wild type BChE. The observed significant differences in kinetic pattern and K(i) values between recombinant wild type BChE and F329A mutant suggest that phenylalanine at position 329 in human BChE is a critical residue in MG and MeG binding to enzyme.
authors.affiliation: Department of Biochemistry, School of Pharmacy, Hacettepe University, 06100 Ankara, Turkey.
authors.forename: Kevser
authors.initials: K
authors.lastname: Biberoglu
authors.forename: Özden
authors.initials: Ö
authors.lastname: Tacal
authors.forename: Hakan
authors.initials: H
authors.lastname: Akbulut
mesh_terms: D019943:Amino Acid Substitution; D001665:Binding Sites / Q000235:genetics; D002091:Butyrylcholinesterase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D002800:Cholinesterase Inhibitors / Q000737:chemistry / Q000378:metabolism*; D004396:Coloring Agents / Q000737:chemistry / Q000378:metabolism*; D057809:HEK293 Cells; D006801:Humans; D007700:Kinetics; D008739:Methyl Green / Q000737:chemistry / Q000378:metabolism; D016297:Mutagenesis, Site-Directed; D010649:Phenylalanine / Q000737:chemistry; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012394:Rosaniline Dyes / Q000737:chemistry / Q000378:metabolism
chemical_list: D002800:Cholinesterase Inhibitors; D004396:Coloring Agents; D011994:Recombinant Proteins; D012394:Rosaniline Dyes; C005095:malachite green; D010649:Phenylalanine; D008739:Methyl Green; D002091:Butyrylcholinesterase