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Molecular Characterization of a Phenylalanine Ammonia-lyase Gene (BoPAL1) from Bambusa Oldhamii

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Journal Mol Biol Rep
Specialty Molecular Biology
Date 2010 Apr 1
PMID 20354908
Citations 23
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Abstract

Phenylalanine ammonia-lyase is the first enzyme of general phenylpropanoid pathway. A PAL gene, designated as BoPAL1, was cloned from a Bambusa oldhamii cDNA library. The open reading frame of BoPAL1 was 2,139 bp in size and predicted to encode a 712-amino acid polypeptide. BoPAL1 was the first intronless PAL gene found in angiosperm plant. Several putative cis-acting elements such as P box, GT-1motif, and SOLIPs involved in light responsiveness were found in the 5'-flanking sequence of BoPAL1 which was obtained by TAIL-PCR method. Recombinant BoPAL1 protein expressed in Pichia pastoris was active. The optimum temperature and pH for BoPAL1 activity was 50°C and 9.0, respectively. The molecular mass of recombinant BoPAL1 was estimated as 323 kDa using gel filtration chromatography and the molecular mass of full-length BoPAL was about 80 kDa, indicating that BoPAL1 presents as a homotetramer. The Km and kcat values of BoPAL1 for L-Phe were 1.01 mM and 10.11 s(-1), respectively. The recombinant protein had similar biochemical properties with PALs reported in other plants.

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