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  • Title: The protein encoded by the Shewanella colwelliana melA gene is a p-hydroxyphenylpyruvate dioxygenase.
    Author: Ruzafa C, Solano F, Sanchez-Amat A.
    Journal: FEMS Microbiol Lett; 1994 Dec 01; 124(2):179-84. PubMed ID: 7813886.
    Abstract:
    The identity of the product of the melA gene from Shewanella colwelliana with the enzyme p-hydroxyphenylpyruvic dioxygenase is shown. Cloning of the melA gene endowed Escherichia coli with the capacity to synthesize melanin-like pigments from L-tyrosine. E. coli contained transaminases that transforms L-tyrosine into p-hydroxyphenylpyruvate. This keto acid was detected in the cultures. On the other hand, E. coli containing melA was able to go further in the catabolic pathway, releasing a great amount of homogentisic acid. This acid can spontaneously polymerize giving the pigment. Furthermore, p-hydroxyphenyl-pyruvate dioxygenase activity was detected in this system. Analysis of the deduced amino acid sequence revealed a high homology with the p-hydroxyphenylpyruvate dioxygenase enzyme from different organisms.
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