Abstract:
:Spectrophotometric titration of pyridoxamine-pyruvate transaminase (EC 2.6.1.30) with pyridoxal at pH 7.15 gives four equivalent binding sites per tetramer. The pH dependence of the equilibrium constant for the association of 5'-deoxypyridoxal with the active site lysine residue was determined spectrophotometrically. These dissociation constants increase with increasing pH over the range pH 7.5-9 and are correlated with the values obtained from fast reactions kinetics (Gilmer, P. J., and Kirsch, J. F. (1977), Biochemistry 16 (following paper in this issue)). In addition to this specific reaction at an active site lysine residue, a second slower reaction at non-active site residues is observable at pH values greater than 8. The pH dependencies of the association and dissociation rate constants for this slow reaction were studied over the pH range 8 to 9 after blocking the active site by NaBH4 reduction of the pyridoxal adduct. The enzyme is stabilized and markedly activated by potassium ion.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Gilmer PJ,McIntire WS,Kirsch JFdoi
10.1021/bi00643a013subject
Has Abstractpub_date
1977-11-29 00:00:00pages
5241-6issue
24eissn
0006-2960issn
1520-4995journal_volume
16pub_type
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