CA2176236C

Tyrosinase-activator protein fusion enzyme

Abstract

The present invention relates to a nucleic acidsequence encoding a fusion enzyme comprising a nucleicacid sequence encoding for a tyrosinase and a nucleicacid sequence encoding for a tyrosinase activatorprotein. Activator proteins used in the presentinvention are ORF438 and URF402. Prokaryotictyrosinases that require a separate activator protein,particularly tyrosinases derived from Streptomyces arepreferred. It is also preferred that the activatorprotein sequence be positioned (5') relative to thetyrosinase sequence. The present invention alsorelates to a fusion enzyme which comprises an aminoacid sequence for tyrosinase and an amino acid sequencefor a tyrosinase activator protein, which may alsocontain a linker positioned between the amino acidsequences of the activator protein and the tyrosinase.The present invention also relates to melanin producedby a fusion enzyme of the present invention.

CA2176236C, drawing sheet 1
Sheet 1 of 9

Term

Term ended

Expired 8 November 2014, 11.9 years ago.

  1. Priority
  2. Filed
  3. Granted
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  5. Today

41 claims: 6 independent, 35 dependent

  1. 1
    CA 02176236 2000-07-31 WO 95/13386 PCT7US94/12857 - 40 THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:1. A nucleic acid sequence encoding a fusion enzyme comprising a nucleic acid sequence encoding for a tyrosinase and a nucleic acid sequence encoding for a tyrosinase activator protein positioned 5’ relative to the tyrosinase sequence.
  2. 13
    A vector for transforming an organism, said vector comprising :a nucleic acid sequence encoding for a fusion enzyme, said fusion enzyme comprising an amino acid sequence encoding for a tyrosinase and an amino acid sequence encoding for a tyrosinase activator protein that is positioned on the N-terminus end of the tyrosinase sequence;and a promoter sequence that regulates the transcription of fusion enzyme.
  3. 24
    A fusion enzyme comprising an amino acid sequence for tyrosinase and an amino acid sequence for a tyrosinase activator protein that is positioned on the N-terminus end of the tyrosinase sequence.
  4. 33
    An in vitro method of producing a melanin comprising the steps of contacting 25 a fusion enzyme comprising an amino acid sequence for tyrosinase and an amino acid sequence for a tyrosinase activator protein that is positioned on the N-terminus end of the tyrosinase sequence and a reaction substrate selected from the group consisting of L-tyrosine, 30 X/L-tyrosine, L-tyrosine/X and X/L-tyrosine/X where X is a single amino acid, a dipeptide or an oligopeptide bound to L-tyrosine, under suitable reaction conditions, to form melanin. CA 02176236 2001-02-08 WO 95/13386 PCT/US94/12857 - 44
  5. 34
    A method of producing melanins, comprising the step of growing an organism which has been transformed with a vector comprising a nucleic acid sequence encoding for a fusion enzyme, said fusion enzyme comprising an amino acid sequence encoding for a tyrosinase and an amino acid sequence encoding for a tyrosinase activator protein that is positioned on the N-terminus end of the tyrosinase sequence ;and a promoter sequence that regulates the transcription of fusion enzyme.
  6. 38
    A nucleic acid sequence encoding a fusion enzyme comprising a nucleic acid sequence encoding a tyrosinase with cresolase activity and catecholase activity;and a nucleic acid encoding a tyrosinase activator protein that is positioned 5' relative to the nucleic acid sequence encoding the tyrosinase with cresolase activity and catecholase activity.