Efficient Synthesis of β‐Primeverosides as Aroma Precursors by Transglycosylation of β‐Diglycosidase from Penicillium multicolor
摘要:
The enzyme activity transferring a beta-primeverosyl unit was found from culture filtrates of Penicillium multicolor IAM7153 and was useful for synthesizing a series of beta-primeverosides via a beta-primeverosyl transfer reaction in an aqueous-organic biphasic system. With the acceptors benzyl alcohol, 2-phenylethanol, and ( Z )-3-hexenol, the enzyme induced the transfer products benzyl, 2-phenylethyl, and ( Z )-3-hexyl beta-primeverosides in high yields of 51% to 70% based on the donor added. When geraniol and eugenol were used as acceptors, the corresponding geranyl and eugenyl beta-primeverosides were obtained in lower yields of 8% to 12%. The enzyme was an excellent tool for producing naturally occurring beta-primeverosides on a mmol scale.
p-Nitrophenyl and eugenyl β-primeveroside (6-O-β-D-xylopyranosyl-β-D-glucopyranoside) hydrolytic activity was found in culture filtrate from Penicillium multicolor IAM7153, and the enzyme was isolated. The enzyme was purified as a β-primeverosidase-like enzyme by precipitation with ammonium sulfate followed by successive chromatographies on Phenyl Sepharose, Mono Q, and β-galactosylamidine affinity columns. The molecular mass was estimated to be 50 kDa by SDS–PAGE and gel filtration. The purified enzyme was highly specific toward the substrate p-nitrophenyl β-primeveroside, which was cleaved in an endo-manner into primeverose and p-nitrophenol, but a series of β-primeveroside as aroma precursors were hydrolyzed only slightly as substrates for the enzyme. In analyses of its hydrolytic action and kinetics, the enzyme showed narrow substrate specificity with respect to the aglycon and glycon moieties of the diglycoside. We conclude that the present enzyme is a kind of β-diglycosidase rather than β-primeverosidase.
The enzyme activity transferring a beta-primeverosyl unit was found from culture filtrates of Penicillium multicolor IAM7153 and was useful for synthesizing a series of beta-primeverosides via a beta-primeverosyl transfer reaction in an aqueous-organic biphasic system. With the acceptors benzyl alcohol, 2-phenylethanol, and ( Z )-3-hexenol, the enzyme induced the transfer products benzyl, 2-phenylethyl, and ( Z )-3-hexyl beta-primeverosides in high yields of 51% to 70% based on the donor added. When geraniol and eugenol were used as acceptors, the corresponding geranyl and eugenyl beta-primeverosides were obtained in lower yields of 8% to 12%. The enzyme was an excellent tool for producing naturally occurring beta-primeverosides on a mmol scale.