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    FEBS Lett. 1996 Sep 16;393(2-3):269-72.

    The C-terminal of rat 4-hydroxyphenylpyruvate dioxygenase is indispensable for enzyme activity.

    Lee MH, Zhang ZH, MacKinnon CH, Baldwin JE, Crouch NP.

    Dyson Perrins Laboratory, University of Oxford, UK.

    We have cloned and overexpressed rat 4-hydroxyphenylpyruvate dioxygenase (4HPPD) in Escherichia coli. The soluble, active recombinant enzyme was shown to contain both 4HPPD and alpha-ketoisocaproate dioxygenase (alpha KICD) activity. However, upon truncation of the 14 amino acids at the C-terminus by site-directed mutagenesis, the resulting mutant enzyme (rat F antigen) exhibited complete loss of 4HPPD and alpha KICD activities. This finding suggests that the C-terminal extension domain plays an essential role in the catalytic activity of the enzyme.

    PMID: 8814303 [PubMed - indexed for MEDLINE]

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