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  • PCR amplification and cloning of tyrosine decarboxylase involved in synephrine biosynthesis in Citrus.

PCR amplification and cloning of tyrosine decarboxylase involved in synephrine biosynthesis in Citrus.

New biotechnology (2010-04-21)
Glenn E Bartley, Andrew P Breksa, Betty K Ishida
ABSTRACT

The phenolic amine synephrine is a vascoconstrictor and bronchiectatic agent and holds promise as an aid to weight management and obesity reduction. Synephrine is structurally similar to the active ingredients of several commercial cold remedies. Some Citrus contain high concentrations of synephrine. An enzyme involved in synephrine biosynthesis, tyrosine decarboxylase (TYDC), is a pyridoxal-5'-phosphate (PLP)-dependent enzyme that decarboxylates tyrosine to yield CO(2) and tyramine. We used PCR to screen, clone and sequence this gene from various synephrine producing and nonproducing Citrus species and varieties to determine if DNA sequence of this gene correlated with synephrine presence. PCR amplification and comparison of DNA sequence indicates DNA sequence differences that may cause production of truncated proteins to be produced in some nonsynephrine producing Citrus. Synephrine production may be genetically determined in part by the gene for TYDC.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
L-Tyrosine Decarboxylase from Streptococcus faecalis, ≥0.1 unit/mg solid
Sigma-Aldrich
L-Tyrosine Decarboxylase Apoenzyme from Streptococcus faecalis, <0.005 unit/mg solid (without pyridoxal 5-phosphate), ≥0.05 unit/mg solid (with excess pyridoxal 5-phosphate)