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Functional characterization of two acyltransferases from Populus trichocarpa capable of synthesizing benzyl benzoate and salicyl benzoate, potential intermediates in salicinoid phenolic glycoside biosynthesis.

Phytochemistry (2015-01-07)
Russell J Chedgy, Tobias G Köllner, C Peter Constabel
ABSTRACT

Salicinoids are phenolic glycosides (PGs) characteristic of the Salicaceae and are known defenses against insect herbivory. Common examples are salicin, salicortin, tremuloidin, and tremulacin, which accumulate to high concentrations in the leaves and bark of willows and poplars. Although their biosynthetic pathway is not known, recent work has suggested that benzyl benzoate may be a potential biosynthetic intermediate. Two candidate genes, named PtACT47 and PtACT49, encoding BAHD-type acyl transferases were identified and are predicted to produce such benzylated secondary metabolites. Herein described are the cDNA cloning, heterologous expression and in vitro functional characterization of these two BAHD acyltransferases. Recombinant PtACT47 exhibited low substrate selectivity and could utilize acetyl-CoA, benzoyl-CoA, and cinnamoyl-CoA as acyl donors with a variety of alcohols as acyl acceptors. This enzyme showed the greatest Km/Kcat ratio (45.8 nM(-1) s(-1)) and lowest Km values (45.1 μM) with benzoyl-CoA and salicyl alcohol, and was named benzoyl-CoA: salicyl alcohol O-benzoyltransferase (PtSABT). Recombinant PtACT49 utilized a narrower range of substrates, including benzoyl-CoA and acetyl-CoA and a limited number of alcohols. Its highest Km/Kcat (31.8 nM(-1) s(-1)) and lowest Km (55.3 μM) were observed for benzoyl-CoA and benzyl alcohol, and it was named benzoyl-CoA: benzyl alcohol O-benzoyltransferase (PtBEBT). Both enzymes were also capable of synthesizing plant volatile alcohol esters, such as hexenyl benzoate, at trace levels. Although the activities demonstrated are consistent with roles in salicinoid biosynthesis, direct tests of this hypothesis using transgenic poplar must still be performed.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Hexane, anhydrous, 95%
Sigma-Aldrich
Benzyl alcohol, anhydrous, 99.8%
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Benzyl benzoate, ReagentPlus®, ≥99.0%
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Linalool, 97%
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3,3′-Diaminobenzidine tetrahydrochloride, tablet, 10 mg substrate per tablet
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Acetonitrile
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Cinnamyl alcohol, 98%
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Benzyl benzoate, natural, ≥99%, FCC, FG
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cis-3-Hexen-1-ol, ≥98%, FCC, FG
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Coniferyl alcohol, 98%
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Linalool, ≥97%, FCC, FG
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Deuterium, 99.8 atom % D
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2-Hydroxybenzyl alcohol, 99%
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Deuterium, 99.96 atom % D
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Benzyl acetate, ≥99%
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Benzyl alcohol, ≥99%, FCC, FG
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2-Acetonaphthone, 99%
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cis-3-Hexen-1-ol, natural, >98%, FCC, FG
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(−)-Linalool, ≥95.0% (sum of enantiomers, GC)
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Benzyl alcohol, natural, ≥98%, FG
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cis-3-Hexen-1-ol, 98%
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Benzyl benzoate, ≥99%, FCC, FG
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Benzyl acetate, ≥99%, FCC, FG
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Deuterium, 99.9 atom % D
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Cinnamyl alcohol, ≥98%, FG
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Benzyl benzoate, meets USP testing specifications
SAFC
Benzyl alcohol, PharmaGrade, USP/NF, Ph. Eur., Manufactured under appropriate GMP controls for pharma or biopharmaceutical production.
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Hexane, HPLC Plus, for HPLC, GC, and residue analysis, ≥95%
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Deuterium hydride, extent of labeling: 96 mol% DH, 98 atom % D
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Benzyl acetate, natural, ≥99%, FCC, FG

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