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. 1992 Jun 15;284(Pt 3):687–695. doi: 10.1042/bj2840687

Purification and characterization of the blue-green rat phaeochromocytoma (PC12) tyrosine hydroxylase with a dopamine-Fe(III) complex. Reversal of the endogenous feedback inhibition by phosphorylation of serine-40.

K K Andersson 1, C Vassort 1, B A Brennan 1, L Que Jr 1, J Haavik 1, T Flatmark 1, F Gros 1, J Thibault 1
PMCID: PMC1132593  PMID: 1352446

Abstract

Tyrosine hydroxylase (TH) was purified from tumours of rat phaeochromocytoma (PC12) cells by a three-step purification procedure giving 30 mg of pure enzyme in 3 days. The enzyme sedimented with an S(eo),w value of 9.2 S and revealed an apparent subunit molecular mass of 62 kDa with a minor 60 kDa component. Two-dimensional gel isoelectric focusing/electrophoresis and tryptic digestion revealed that the heterogeneity could be accounted for by limited proteolysis of the 62 kDa component and the presence of covalently bound phosphate. The enzyme had a strong blue-green colour (epsilon 700 = 3.1 +/- 0.2 mM-iron-1.cm-1). The resonance Raman spectrum obtained with lambda excitation = 605 nm revealed the presence of an Fe(III)-catecholamine complex in the isolate enzyme, similar to that observed in the bovine adrenal enzyme [Andersson, Cox, Que, Flatmark & Haavik (1988) J. Biol. Chem. 263, 18621-18626]. In the rat PC12 enzyme, all of the iron present (0.53 +/- 0.03 atom per subunit) seems to be chelated by the feedback inhibitors (0.49 +/- 0.05 mol of dopamine and 0.10 +/- 0.03 mol of noradrenaline per mol of subunit). The e.p.r. spectra at 3.6 K show g-values at 7.0, 5.2 and 1.9 as observed for other catecholate-complexed enzymes. After phosphorylation of serine-40 and addition of L-tyrosine a new rhombic (magnitude of E/D = 0.33) e.p.r. species could be observed. Phosphorylation of serine-40 by cyclic AMP-dependent protein kinase increased the catalytic activity; depending on assay conditions, up to 80-110-fold activation could be observed when measured at high TH (i.e. high endogenous catecholamine) concentration.

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Selected References

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