多酚氧化酶（菌菇）/酪氨酸酶/Polyphenol oxidase

 Description
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Biochem/physiol Actions Converts tyrosine to L-DOPA or tyramine to dopamine
General description Isoelectric point （pI）: 4.7-5
pH optimum is 6-7

Molecular weight: 128 kDa by sedimentation velocity diffusion; 133 kDa by light-scattering measurements, and 119.5 kDa by electrophoresis.

Tyrosinase is a copper-containing oxidase, which has activity for both catechols and cresol. It is responsible for browning reactions. The enzyme is reported to have two binding sites for aromatic substrates and a different binding site for oxygen-copper. The copper is probably Cu（I）, with inactivation involving oxidation to Cu（II） ion.
Unit Definition One unit = ΔA280 of 0.001 per min at pH 6.5 at 25 °C in 3 mL reaction mix containing L-tyrosine.

Properties
form lyophilized powder
storage temp. −20°C

Safety
Personal Protective Equipment Eyeshields, Gloves, type N95 （US）, type P1 （EN143） respirator filter
Safety Statements 22-24/25
WGK Germany 2
 

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