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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Human recombinant tyrosinase destabilization caused by the double mutation R217Q/R402Q.

Sarah Toay1, Narin Sheri2, Ian MacDonald2,3

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Protein Science : a Publication of the Protein Society
|January 22, 2025
PubMed
Summary
This summary is machine-generated.

Oculocutaneous albinism, caused by TYR gene mutations, impacts tyrosinase enzyme activity. This study reveals that the double mutant R217Q/R402Q significantly reduces tyrosinase activity, linking atomic changes to disease.

Keywords:
OCA1‐related genetic mutationsmolecular dynamicsoculocutaneous albinism type 1tyrosinase

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Area of Science:

  • Genetics
  • Biochemistry
  • Molecular Biology

Background:

  • Oculocutaneous albinism is an inherited disorder linked to TYR gene mutations.
  • Single mutations in tyrosinase (Tyr) can impair its catalytic function.
  • The combined effect of multiple Tyr mutations is less understood.

Purpose of the Study:

  • To investigate the impact of single (R217Q, R402Q) and double (R217Q/R402Q) tyrosinase mutations.
  • To correlate atomic-level protein alterations with disease phenotypes in albinism.
  • To analyze the functional consequences of combined Tyr mutations.

Main Methods:

  • Expression and purification of human recombinant intra-melanosomal Tyr domains and mutant variants in T. ni.
  • Enzymatic assays to measure diphenolase activity of wild-type and mutant Tyr.
  • Molecular dynamics simulations and computational analysis of the Tyr homology model.

Main Results:

  • Purified R217Q and R217Q/R402Q variants exhibited reduced catalytic activities compared to wild-type Tyr.
  • The R402Q variant showed activity comparable to wild-type Tyr.
  • The double mutant R217Q/R402Q displayed the most significant reduction in protein activity.

Conclusions:

  • The R217Q mutation, especially in combination with R402Q, substantially decreases tyrosinase catalytic activity.
  • These findings establish a link between specific TYR gene mutations and impaired enzyme function in albinism.
  • The double mutant R217Q/R402Q provides insight into the severe impact of combined genetic alterations on tyrosinase activity.